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Effect of Carbon on the Microstructures and Stress Rupture Properties of a Polycrystalline Ni-Based Superalloy

Acta Metallurgica Sinica(English Letters) 2025年第1期38卷 151-163页

作者： Han Wang Shijie Sun Naicheng Sheng Guichen Hou Jinguo Li Yizhou Zhou Xiaofeng Sun Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China

The effect of carbon content on the microstructures and stress rupture properties of a newly developed polycrystalline Ni-based superalloy with high Cr content has been *** was observed that both grain size and the number of carbides increased with an increase in carbon *** heat treatment,granular M_(23)C_(6)carbides were dispersed around MC carbides along grain boundaries and inside *** quantity of granular M_(23)C_(6)carbides increased while their sizes *** findings can be verified with the results of thermodynamic calculation and differential scanning calorimetry *** stress rupture times(975℃/225 MPa)increased from 13.3 to 25.5 h with the carbon content increased from 0.1 to 0.2 wt.%.The improvement can be attributed to two primary ***,grain boundary is typically weak region during deformation process and the grain size increased as carbon content increased in the ***,carbides act as hindrances to impede dislocation movement,leading to dislocation *** carbon content rose,the quantity of carbides in interdendritic regions and grain boundaries increased,providing a certain degree of strengthening effect and resulting in a longer stress rupture time.

关键词： Ni-based superalloy Microstructure Stress rupture property Carbon Carbide

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Strengthening-softening transition and maximum strength in Schwarz nanocrystals

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Nano Materials science 2024年第3期6卷 320-328页

作者： Hanzheng Xing Jiaxi Jiang Yujia Wang Yongpan Zeng Xiaoyan Li Center for Advanced Mechanics and Materials Applied Mechanics LaboratoryDepartment of Engineering MechanicsTsinghua UniversityBeijing100084China Institute of High Performance Computing(IHPC) Agency for ScienceTechnology and Research(A*STAR)Singapore138632Singapore

Recently,a Schwarz crystal structure with curved grain boundaries(GBs)constrained by twin-boundary(TB)networks was discovered in nanocrystalline Cu through experiments and atomistic *** Cu with nanosized Schwarz crystals exhibited high strength and excellent thermal ***,the grainsize effect and associated deformation mechanisms of Schwarz nanocrystals remain ***,we performed large-scale atomistic simulations to investigate the deformation behaviors and grain-size effect of nanocrystalline Cu with Schwarz *** simulations showed that similar to regular nanocrystals,Schwarz nanocrystals exhibit a strengthening-softening transition with decreasing grain *** critical grain size in Schwarz nanocrystals is smaller than that in regular nanocrystals,leading to a maximum strength higher than that of regular *** simulations revealed that the softening in Schwarz nanocrystals mainly originates from TB migration(or detwinning)and annihilation of GBs,rather than GB-mediated processes(including GB migration,sliding and diffusion)dominating the softening in regular *** analyses of simulation data further showed that compared with those in regular nanocrystals,the GB-mediated processes in Schwarz nanocrystals are suppressed,which is related to the low volume fraction of amorphous-like GBs and constraints of TB *** smaller critical grain size arises from the suppression of GB-mediated processes.

关键词： Schwarz nanocrystal Curved grain boundary Atomistic simulation Grain size effect Maximum strength

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Effect of annealing treatment on the microstructure and mechanical properties of warm-rolled Mg-Zn-Gd-Ca-Mn alloys

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2208-2220页

作者： Yifan Song Xihai Li Jinliang Xu Kai Zhang Yaozong Mao Hong Yan Huiping Li Rongshi Chen School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shandong Key Laboratory of Advanced Aluminium Materials and Technology Binzhou Institute of TechnologyBinzhou 256606China

The basal texture of traditional magnesium alloy AZ31 is easy to form and exhibits poor plasticity at room *** address these problems,a multi-micro-alloyed high-plasticity Mg-1.8Zn-0.8Gd-0.1Ca-0.2Mn(wt%)alloy was developed using the unique role of rare earth and Ca solute *** addition,the influence of the annealing process on the grain size,second phase,texture,and mechanical properties of the warm-rolled sheet at room temperature was analyzed with the goal of developing high-plasticity mag-nesium alloy sheets and obtaining optimal thermal-mechanical treatment *** results show that the annealing temperature has a significant effect on the microstructure and properties due to the low alloying content:there are small amounts of larger-sized block and long string phases along the rolling direction(RD),as well as several spherical and rodlike particle phases inside the *** increas-ing annealing temperature,the grain size decreases and then increases,and the morphology,number,and size of the second phase also change *** particle phase within the grains vanishes at 450℃,and the grain size increases *** the full recrystal-lization stage at 300-350℃,the optimum strength-plasticity comprehensive mechanical properties are presented,with yield strengths of 182.1 and 176.9 MPa,tensile strengths of 271.1 and 275.8 MPa in the RD and transverse direction(TD),and elongation values of 27.4%and 32.3%,***,there are still some larger-sized phases in the alloy that influence its mechanical properties,which offers room for improvement.

关键词： Mg-Zn-Gd-Ca-Mn alloy annealing treatment microstructure texture dynamic recrystallization mechanical properties

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Deep learning for predictive mechanical properties of hot-rolled strip in complex manufacturing systems

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International Journal of Minerals,Metallurgy and Materials 2023年第6期30卷 1093-1103页

作者： Feifei Li Anrui He Yong Song Zheng Wang Xiaoqing Xu Shiwei Zhang Yi Qiang Chao Liu National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing 100083China China Academy of Machinery Science and Technology Beijing 100044China

Higher requirements for the accuracy of relevant models are put throughout the transformation and upgrade of the iron and steel sector to intelligent *** has been difficult to meet the needs of the field with the usual prediction model of mechanical properties of hotrolled *** data and difficult parameter adjustment limit deep learning models based on multi-layer networks in practical applications;besides,the limited discrete process parameters used make it impossible to effectively depict the actual strip processing *** order to solve these problems,this research proposed a new sampling approach for mechanical characteristics input data of hot-rolled strip based on the multi-grained cascade forest(gcForest)*** to the characteristics of complex process flow and abnormal sensitivity of process path and parameters to product quality in the hot-rolled strip production,a three-dimensional continuous time series process data sampling method based on time-temperature-deformation was *** basic information of strip steel(chemical composition and typical process parameters)is fused with the local process information collected by multi-grained scanning,so that the next link’s input has both local and global ***,in the multi-grained scanning structure,a sub sampling scheme with a variable window was designed,so that input data with different dimensions can get output characteristics of the same dimension after passing through the multi-grained scanning structure,allowing the cascade forest structure to be trained ***,actual production data of three steel grades was used to conduct the experimental *** results revealed that the gcForest-based mechanical property prediction model outperforms the competition in terms of comprehensive performance,ease of parameter adjustment,and ability to sustain high prediction accuracy with fewer samples.

关键词： hot-rolled strip prediction of mechanical properties deep learning multi-grained cascade forest time series feature extraction variable window subsampling

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MDA-JITL model for on-line mechanical property prediction

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Journal of Iron and Steel research International 2023年第3期30卷 504-515页

作者： Fei-fei Li An-rui He Yong Song Xiao-qing Xu Shi-wei Zhang Yi Qiang Chao Liu National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing 100083China China Academy of Machinery Science and Technology Beijing 100044China

Mechanical performance prediction is the key to the transformation and upgrading of steel enterprises to intelligent *** to time-varying manufacturing data,the traditional prediction model of mechanical properties of hotrolled strip may cause performance degradation or even failure in its *** MDA-JITL model was thus proposed to handle the modeling problem of complex time-varying *** parameters were first chosen and ***,a distance measurement method combining the importance of data attributes and time characteristics was designed to select the most suitable samples for on-line local *** that,using the chosen dataset,a linear local model was created to predict target ***,an uncertainty evaluation method was designed to evaluate the uncertainty of prediction ***,the appropriate dataset partition and off-line simulation experiment scheme were created based on the peculiarities of hot-rolling *** suggested model performs much better than the classic global model when applied to actual production data from a steel *** stability of its prediction accuracy is demonstrated in a simulation prediction for up to five ***,there is a high link between the uncertainty evaluation metrics and the prediction error of the model,reducing the field sampling rate by 30%in industrial applications in the latest year.

关键词： JITL Feature weighting Rolling training Prediction Mechanical property

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Interactive effect of thermal aging and proton irradiation on microstructural evolution and hardening ofδ-ferrite in 308L stainless steel weld metal

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Journal of Materials science & technology 2024年第3期170卷 140-155页

作者： Xiaodong Gao Xiaodong Lin Tao Guo Lining Xu Yaolei Han Baolong Jiang Xingyuan Mei Qunjia Peng Lijie Qiao Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Institute of Materials Shanghai UniversityShanghai 200072China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Suzhou Nuclear Power Research Institute Suzhou 215004China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

In the harsh service environment of high temperature and intense neutron irradiation in water-cooled nuclear reactors,the austenitic stainless steel weld overlay cladding on the inner surface of the reactor pressure vessel suffers from thermal aging and irradiation damage simultaneously,which can induce microstructural evolution and hardening of the *** it is quite difficult to achieve this simul-taneous process out of the pile,two kinds of combined experiments,i.e.,post-irradiation thermal aging and post-aging irradiation were performed on 308 L stainless steel weld metals in this *** interactive effect of thermal aging and proton irradiation on microstructural evolution and hardening ofδ-ferrite in 308 L weld metal was investigated by combining atom probe tomography,transmission elec-tron microscopy and nanoindentation *** results revealed that thermal aging could eliminate the dislocation loops induced by irradiation and affect the phase transition process by accelerating spinodal decomposition and G-phase precipitation,thus enhancing hardening of irradiatedδ-*** the effect of irradiation on the microstructure and hardening of thermally agedδ-ferrite,however,intensive collision cascades can intensify G-phase precipitation and dislocation loop formation but decrease spinodal decomposition,leading to a limited effect on hardening of thermally agedδ-***,the interaction of thermal aging and irradiation can promote G-phase ***,the interaction can causeδ-ferrite hardening,which is mainly influenced by spinodal decomposition,followed by G-phase and dislocation loops,where spinodal decomposition and G-phase cause hardening by inducing strain fields.

关键词： Austenitic stainless steel weld metals Thermal aging Proton irradiation Interaction Microstructural evolution Hardening

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The effect of precipitates on the fracture behavior and tensile properties of Mg-14Gd-0.5Zr(wt.%)alloy

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Journal of Materials science & technology 2024年第13期180卷 226-242页

作者： Chunxiao Li Jianxiong Wei Jianfeng Jin Hong Yan Zhiwei Shan Yaozong Mao Rongshi Chen School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Beijing Institute of Space Long March Vehicle Beijing 100076China Center for Advancing Materials Performance From the Nanoscale(CAMP-Nano)&Hysitron Applied Research Center in China(HARCC) State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an 710049China Key Laboratory of Advanced Aluminium Materials and Technology Binzhou Institute of TechnologyWeiqiao-UCAS Science and Technology ParkBinzhou 256606China

The effect of precipitation aging on the fracture behavior of cast Mg-14.23Gd-0.45Zr(wt.%)alloy at room temperature has been studied in this *** tensile and three-point bending tests were conducted on samples peak-aged at 175,200,225,and 250 ℃.Notably,samples aged at 175 ℃ and 200 ℃ exhibited premature fracture during the uniaxial tensile *** fractographic observations of the tensile test samples and electron backscattered diffraction(EBSD)analysis on the samples sub-jected to three-point bending tests,a preferential formation of cleavage cracks in samples aged at 175 ℃ and 200 ℃ was identified as the reason for their premature *** X-ray diffraction(XRD)results and transmission electron microscopy(TEM)observations of precipitates indicate that the dominant strengthening precipitates in all peak-aged samples are of theβ'phase,and their size significantly influences the formation of cleavage *** phenomenon is attributed to the shearing mechanism of ***,the smaller β'precipitates formed under the aging temperature of 175-200 ℃ are susceptible to dislocation shearing,leading to the formation of cleavage *** contrast,the larger size of β'precipitates formed under the aging temperature of 225-250 ℃ provides resistance to shearing,resulting in the restrained formation of cleavage cracks and ultimately contributing to the enhancement of the ultimate tensile strength.

关键词： Fracture Mg-RE alloy Precipitate Aging treatment Mechanical property

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Temperature/stress dependence of stress rupture behavior and deformation microstructure of an advanced superalloy for additive manufacturing

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材料科学技术（英文版） 2025年第3期206卷 37-52页

作者： Wei Song Junying Yang Jingjing Liang Nannan Lu Yizhou Zhou Xiaofeng Sun Jinguo Li Shi-Changxu Innovation Center for Advanced Materials Superalloys DivisionInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-Changxu Innovation Center for Advanced Materials Superalloys DivisionInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China

A self-developed crack-free advanced superalloy ZGH451 fabricated by direct energy deposition(DED)was applied to investigate the microstructure evolution,stress rupture behavior,and deformation mech-anisms at moderate-high temperatures and high-low stress *** high Ta/Al ratio induces large misfit lattice stress and low stacking fault energy of alloy,resulting in approximate cubic γ'phases in dendrites and the formation of initial dislocation *** the stress rupture test at 760 ℃/780 MPa,high content cubic γ'phases,small size of voids as well as preserved dislocation tangles are observed,showing stable structures with high-stress rupture *** content and suitable size of cubicγ'phases,initial dislocation tangles,and L-C locks hinder the dislocation motion,which decreases the minimum strain rate and prolongs life significantly,forming four stress rupture ***,the defor-mation mechanism is determined by dislocation piled-up on γ/γ'interface,formation of stacking faults in γ'phases,and dislocations shearing γ'***,the microstructure exhibits uneven struc-tures composed of large sizes of rafted γ'phases and voids at 980 ℃/260 *** rafted structure and high temperature provide continuous channels and enough energy for dislocation motion,resulting in the increase of minimum strain rate,decline of life,and typic three stress rupture stages,even though there are obstacles to dislocation movement caused by dislocation *** deformation mecha-nism transforms to form dislocation networks on γ/γ'interface and dislocations shearing γ'***-sides,the decomposition of carbides on GBs also depends on temperature,which decomposes into harm-ful chain-like M23C6 carbides at moderate temperatures and reinforced granular-shaped M6C carbides at high *** applied stress always decreases mechanical properties due to its degradation of microstructure induced by elongating the precipitates and defects.

关键词： Additive manufacturing Nickel-based superalloys Stress rupture behavior Microstructure evolution Deformation mechanisms

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Stability and melting behavior of boron phosphide under high pressure

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Chinese Physics B 2024年第4期33卷 579-584页

作者：梁文嘉向晓君李倩梁浩彭放 Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China School of Mathematics and Physics Southwest University of Science and TechnologyMianyang 621900China Center for High Pressure Science and Technology Advanced Research Shanghai 201203China

Boron phosphide(BP)has gained significant research attention due to its unique photoelectric and mechanical *** this work,we investigated the stability of BP under high pressure using x-ray diffraction and scanning electron *** phase diagram of BP was explored in both B-rich and P-rich environments,revealing crucial insight into its behavior at 5.0 ***,we measured the melting curve of BP from 8.0 GPa to 15.0 *** findings indicate that the stability of BP under high pressure is improved within B-rich and P-rich ***,we report a remarkable observation of melting curve frustration at 10.0 *** study will enhance our understanding of stability of BP under high pressure,shedding light on its potential application in semiconductor,thermal,and light-transmitting devices.

关键词： boron phosphide stability melting curve high pressure

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Preparation and properties of ZrO_(2)-strengthened porous mullite insulation materials using Y_(2)O_(3) additive

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Journal of Iron and Steel research International 2024年第6期31卷 1514-1521页

作者： Wang-zhi Yu Yi-hong Shi Ping Liu Yong-wan Wu Cheng-hao Song Xian-gong Deng Xiang Ding Song-lin Ran Yi Zhang Hai-jun Zhang Hai-liang Deng Advanced Ceramics Research Center School of Materials Science and EngineeringAnhui University of TechnologyMa'anshan 243002AnhuiChina The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina

ZrO_(2)-strengthened porous mullite insulation materials were prepared by foaming technology utilizing ZrSiO_(4) and Al_(2)O_(3) as primary materials and Y_(2)O_(3) as an *** effects of Y_(2)O_(3) contents on the phase composition,microstructure,mechanical properties,and heat conductivity of the porous mullite insulation materials were investigated.A suitable Y_(2)O_(3) content could promote phase transition of monoclinic ZrO_(2)(m-ZrO_(2))to tetragonal ZrO_(2)(t-ZrO_(2)),reduce pore size,and improve the strengths of as-prepared *** cold crushing strength and bending strength of as-prepared specimens with a 119µm spherical pore size using 6 wt.%Y_(2)O_(3) were 35.2 and 13.0 MPa,respectively,with a heat conductivity being only 0.248 W/(m K).

关键词： Porous mullite insulation material Zirconium oxide Y_(2)O_(3) Mechanical property Heat conductivity

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