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High-temperature fracture behavior of MnS inclusions based on GTN model

Journal of Iron and Steel Research International 2019年第9期26卷 941-952页

作者： Xin-gang Liu Can Wang Qing-feng Deng Bao-feng Guo Key Laboratory of Advanced Forging and Stamping Technology and Science (Yanshan University) Ministry of Education of ChinaQinhuangdao 066004HebeiChina

The influence of the MnS plastic inclusion on the accumulation of internal damage was considered, and the Gurson– Tvergaard–Needleman (GTN) model was calibrated based on the finite element inverse method and image analysis method using ABAQUS and GTN models. The modified GTN damage model was used to simulate the initiation and propagation of cracks in an as-cast 304 stainless steel with MnS inclusions at 900 C. The simulation results agreed well with the experimental results, indicating that the model can be effectively applied to examine the high-temperature fracture behavior of MnS inclusions. The simulation and high-temperature tensile test results revealed that MnS inclusions increased the number of holes initiation and the probability of hole polymerization, reduced the crack propagation resistance, accelerated the occurrence of material fracture behavior, and were closely related to the stress state at high temperatures. When the stress triaxiality was low, the plastic strain in the metal matrix was high, and the MnS plastic inclusions accelerated the polymerization of the pores, making metal fracture failure more likely. On the other hand, when the stress triaxiality was high, the stress state in the metal matrix was biased to the tensile state, the plastic strain in the metal matrix was low, and the influence of MnS plastic inclusions on the fracture behavior was not evident.

关键词： MnS inclusion GTN model Tension High-temperature fracture behavior Crack initiation Crack propagation Stress

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Effects of RE on Microstructures and Mechanical Properties of Hot-Extruded AZ31 Magnesium Alloy

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Journal of Rare Earths 2004年第4期22卷 527-532页

作者：刘英陈维平张卫文张大童李元元 Key Laboratory for Advanced Metallic Materials Processing and Forming of Guangdong South China University of Technology Guangzhou 510640 China

Effects of rare earth (RE) additions on microstructure and mechanical properties of the wrought AZ31 magnesium alloy were investigated. The results show that, by adding 0.3%, 0.6% and 1.0% RE elements, the as-cast microstructure can be refined, and the as-cast alloys′ elongation and tensile strength can be improved. After extrusion, the alloy with 0.3% and 0.6% RE additions obtain a finer microstructure and the best mechanical properties, but the alloy with 1.0% RE addition has the coarse Al-RE compound particles in grain boundaries which decreased elongation and tensile properties. Usually, Rare earth (RE) elements were used to improve the creep properties of aluminium-containing magnesium pressure die cast alloys at elevated temperatures. In this paper, it is also found that the high temperature strength of extruded materials can be increased by RE elements additions.

关键词： metal materials AZ31 magnesium alloy rare earth element microstructure mechanical properties

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Microstructure and corrosion performance of laser powder bed fusion produced duplex stainless steel using Ni over-alloyed mixed powder

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Corrosion Science 2025年 253卷

作者： Zhou, Yiqi Wang, Wenqian Li, Lili Wang, Shuoyang Huang, Zhiyuan Zhang, Zequn Kong, Decheng Shang, Feng Zhang, Bowei Li, Xiaogang Yan, Yu Engelberg, Dirk Dong, Chaofang Beijing Advanced Innovation Centre for Materials Genome Engineering Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China Shunde Innovation School University of Science and Technology Beijing Shunde528399 China State Key Laboratory of Nuclear Power Safety Technology and Equipment University of Science and Technology Beijing Beijing100083 China Laboratory of Advanced Materials of Ministry of Education School of Materials Science and Engineering Tsinghua University Beijing100084 China School of Advanced Materials Innovation Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing China Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China School of Mechanical Engineering Jiangsu Ocean University Jiangsu Lianyungang222005 China Metallurgy & Corrosion Department of Materials The University of Manchester ManchesterM13 9PL United Kingdom

Adding Ni alloy to duplex stainless steel (DSS) powder increased austenite content to ∼20 % in laser powder bed fusion (LPBF) 22Cr DSS for as-built conditions. Annealing at 1000 °C promoted austenite formation (>95 %), whereas higher temperatures reduced it to 75 % at 1200 °C. The as-built LPBF 22Cr DSS exhibited a critical pitting potential (Epit) of 0.85 VSCE, which dropped to 0.25 VSCE after 1000 °C annealing, however it rebounded to 0.40 VSCE at 1200 °C. Ni improved tensile properties without enhancing pitting resistance. These results reveal the interplay between microstructure and pitting corrosion behavior, guiding the design of LPBF DSS. © 2025 Elsevier Ltd

关键词： Duplex stainless steel

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Research on hydraulic wind turbine semi-physical simulation platform

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High technology Letters 2015年第3期21卷 269-275页

作者：艾超 Chen Lijuan Kong Xiangdong Liao Lihui Chen Wenting Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Key Laboratory of Advanced Forging & Forming Technology and Science(Yanshan University) Ministry of Education School of Mechanical Engineering Yanshan University

According to a research on the 30kVA simulation experimental platform of hydraulic wind tur- bine, its basic structure, composition and operation principle are expounded in this paper. An in- verter motor is used to simulate the wind turbine, while a similarity calculation method is applied be- tween the small and large wind turbine. A fixed displacement pump-variable motor closed loop is used as the main transmission system, and a self-excited synchronous generator generates electricity through the grid connection. The experiment and simulation study on the speed and power control of the hydraulic wind turbine is conducted, based on the experimental platform, thus correctness and progressiveness of the experiment platform is further verified. The experimental platform study lays a foundation for further research on the characteristics of hydraulic wind turhln~

关键词： wind power generation hydraulic transmission simulation of experimental platform

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Mechanical properties and wear behaviors of lightweight Al3Ti-based medium-entropy alloys at elevated temperatures

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Wear 2025年

作者： Diao, Guijiang He, Anqiang Zhang, Dong Tang, Yunqing Zhou, Yefei Xu, Zhen Chen, keyang Kumar, Aakash Mousavi, Seyed Elias Wu, Mingyu Chen, Wengang Chen, D.L. Li, D.Y. Department of Chemical and Materials Engineering University of Alberta EdmontonABT6G 2H5 Canada State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Jinan250061 China State Key Laboratory of Metastable Materials Science & Technology Yanshan University Qinhuangdao066004 China Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China School of Machinery and Transportation Southwest Forestry University Kunming650224 China Department of Mechanical Industrial and Mechatronics Engineering Toronto Metropolitan University TorontoONM5B 2K3 Canada

Al3Ti-based medium-entropy alloys (MEAs) with improved high-temperature mechanical properties and wear resistance were fabricated using arc melting method via alloying Al3Ti with various amounts of Cr, Mn, Fe and Cu elements. The alloying elements, Cr, Mn, Fe, and Cu, transformed the brittle D022 structure into a ductile L12 structure, along with the formation of hard B2 and D8a second phases. The resultant combination of improved ductility and strength enhances the mechanical performance of the material. A representative alloy, Al60Ti20Cr5Mn5Fe5Cu5, achieved high yield strength and high hardness of 442 MPa and 270HV2 at even 500 °C. Wear tests showed that the Al3Ti-based MEAs distinctly outperformed conventional Al-matrix composite reinforced with 30 wt% of SiC particles at both room temperature and 300 °C. The ordered L12, B2, and D8a phases not only led to good room-temperature strength and hardness, but also contributed to high thermal stability, contrasting with solid solution alloys, resulting in superior high-temperature performance. The results highlight Al3Ti-based MEAs as competitive candidates for medium-temperature applications, bridging the gap between aluminum and titanium alloys in engineering applications. © 2025 The Author(s)

关键词： Titanium alloys

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Characteristics of Precipitation in an As-cast Nb-and V-containing High Nitrogen CrMn Austenitic Steel

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Journal of Iron and Steel Research International 2014年第10期21卷 945-950页

作者： Zhong-ping SHI Zhen-hua WANG Shu-hua SUN Ze-an ZHOU Ying-ping GUAN Wan-tang FU State Key Laboratory of Metastable Materials Science and Technology Yanshan University Key Laboratory of Advanced Forging and Stamping Technology and Science(Yanshan University) Ministry of Education of China

The phase diagram of an Nb- and V-containing 18Mnl8Cr0.5N steel was investigated using thermodynam ic calculation. The compositions and characteristics of precipitates were investigated by scanning electron microsco- py, energy dispersive spectrometry, X-ray diffraction, and differential scanning calorimetry. Under equilibrium con- ditions, MX precipitates at 1 350 ℃. MX is a substitutional solid solution of Nb4 N3.38, and its composition （at. %） is approximately.. Nb 40, N 40, V 8, and Fe, Cr, and Mn balance. The precipitates, with shapes including irregular bulk, rod, and ellipsoid, are primarily distributed at grain boundaries and triple junctions, and their size is approxi- mately 5 10 μm. Finally, the microalloying of high nitrogen CrMn austenite steels, control of precipitate size, and the effect of precipitate on hot formin~ were discussed.

关键词： high nitrogen steel microalloying precipitate

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Amelioration of Mechanical Properties of Rolled Mg-4.5Al-2.5Zn Alloy by Cryogenic Cycling Treatment

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Acta Metallurgica Sinica (English Letters) 2025年 1-17页

作者： Pang, Haoran Lu, Liwei Yang, Gongji Wang, Xiaojun Wang, Wen Zhang, Hua Wu, Yujuan Sanya Institute of Hunan University of Science and Technology Sanya572024 China National Key Laboratory of Precision Hot Processing of Metal Harbin Institute of Technology Harbin150001 China Hunan Rongtuo New Material Research Co. Ltd. Xiangtan411201 China School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials Processing Xi’an University of Architecture and Technology Xi’an710055 China Institute for Advanced Studies in Precision Materials Yantai University Yantai264005 China National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai200240 China

In this study, cryogenic cycling treatment was used to process the hot-rolled Mg-4.5Al-2.5Zn alloy sheets to research the influence on mechanical properties and microstructure. Optical microscopy, electron back-scatter diffraction and transmission electron microscopy were applied to characterize the microstructures and analyze the mechanisms. The consequences indicate that the cryogenic cycling treatment has significantly influence on improving the mechanical properties. With the cycle of cryogenic cycling treatment increasing to 5 cycles, the sample processed by 3 cycles presents the highest ductility (~ 18.6%), while the 4-cycle one shows the highest strength (~ 311.8 MPa). The improvement can be attributed to fine grains, introduced high-density dislocation, 9.8%-fraction low-angle grain boundaries (LAGBs), the precipitation of Mg17Al12 phase and the texture with the intensity of 17.5. Although the average grain sizes of the samples processed by cryogenic cycling treatment have no obvious difference, internal stress variations induced by cryogenic cycling treatment significantly influence LAGBs, the basal texture evolution, and the prismatic slip, pyramidal slip and pyramidal slip activation. © The Author(s) 2025.

关键词： Microhardness

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Numerical modeling and simulation for microneedles drug delivery: A novel comprehensive swelling-obstruction-mechanics model

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European Journal of Pharmaceutics and Biopharmaceutics 2025年 206卷 114583页

作者： Yang, Peijing Song, Qinghua Zhang, Lujie Liu, Zhanqiang Ma, Haifeng School of Mechanical Engineering Shandong University Jinan 250061 China State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Jinan 250061 China Key Laboratory of High Efficiency and Clean Mechanical Manufacture Ministry of Education Jinan 250061 China Key National Demonstration Center for Experimental Mechanical Engineering Education Jinan 250061 China School of Mechanical Electrical & Information Engineering Shandong University Weihai 264209 China

Hydrogel microneedles have attracted significant attention in drug delivery due to their non-invasiveness and efficient administration. However, a thorough understanding of the drug transport mechanism is essential to achieve controlled drug delivery and geometry optimization of microneedles. In this study, a new swelling-obstruction-mechanics model is presented to describe the swelling and drug release behavior of hydrogel microneedles. The model integrates the swelling kinetics, the obstruction scaling of drug molecules, and the mechanical properties of hydrogel and skin and reveals the effects of swelling of the microneedle matrix and drug molecules on drug release. Subsequently, numerical simulations were conducted using the model, which enabled the optimization of hydrogel microneedle design parameters by adjusting the input variables. The results show that the geometric parameters of microneedles, especially the cross-sectional shape, have a significant effect on the drug release performance. Nevertheless, the parameters affect each other and need to be considered in the selection of a variety of factors. Additionally, penetration depth significantly affects drug release efficiency, highlighting the need for auxiliary application devices. In summary, the model advances both theoretical understanding and practical design of hydrogel microneedles, identifying key factors in drug release and optimizing their efficiency and reliability for clinical applications. © 2024 Elsevier B.V.

关键词： Drug delivery Finite element simulation Hydrogel microneedles Mathematical model Mechanical property Swelling and obstruction scaling principle

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Serrated Grain Boundary Modulation Inhibits Nano Cracks Propagation in Pure Magnesium: A Phase Field Crystal and Quasi in-situ EBSD Study

SSRN

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SSRN 2025年

作者： Li, Huanqing Zhao, Yuhong Song, Zhuo Tian, Xiaolin Dong, Ruifeng Zhang, Yuntao Hou, Hua School of Materials Science and Engineering MOE jointly Collaborative Innovation Center for High-performance Al/Mg based Materials Shanxi Key Laboratory of Intelligent Casting and Advanced Forming for New Materials North University of China Taiyuan030051 China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Beijing100083 China School of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan030024 China Institute of Materials Intelligent Technology Liaoning Academy of Materials Shenyang110004 China

Modulating serrated grain boundaries (SGB) has the potential to enhance fracture properties in materials. This work investigates the crack behavior at SGB during loading through high-resolution transmission electron microscopy, quasi in-situ electron backscatter diffraction and phase field crystal simulations. Experimental results demonstrate the presence of abundant SGBs in the transition zone of rolled pure magnesium, with nano-crack initiation and propagation at these boundaries driven by basal or prismatic slip at varying angles between the grains. Additionally, large shear strains are observed in the SGB bending regions, and portions of these regions that align with the loading direction impede crack propagation. Previous studies have suggested that a loading direction perpendicular to the grain boundary (GB) promotes intergranular fracture. However, our research demonstrates that the influence of the angle between GB and the loading direction on crack propagation is localized, with previous conclusions valid only within a strain range of 10-27%. Beyond this critical strain, cracks predominantly transgranular propagate in a brittle manner, with a weaker effect in the loading direction. Furthermore, when the angle between SGB and the loading direction is less than 65°, the proportion of the SGB parallel to the loading direction increases, thereby inhibiting intergranular fracture. Additionally, SGB curvature significantly impacts crack extension, with an optimal curvature of approximately 0.151 1/nm for double-serrated grain boundaries that effectively suppresses nano-crack propagation. This work may provide insights into enhancing material fracture strength through the control of SGB. © 2025, The Authors. All rights reserved.

关键词： Crack propagation

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Control over Mechanical Properties and Microstructure of BR1500HS Hot-stamped Parts

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Journal of Iron and Steel Research International 2014年第6期21卷 606-613页

作者： Bai-liang ZHUANG Zhong-de SHAN Chao JIANG Xin-ya LI State Key Laboratory of Advanced Forming Technology and Equipment of CAM Jiangsu Institute China Academy of Machinery Science and Technology

The hot stamping processing parameters are of critical importance in transforming ultra-high-strength steel （UHSS） into high-quality parts, which were studied by mechanical properties tests, metallographic observations and calculation analysis method based on hot stamping experiments and numerical simulation technology, the mechanical properties, thickness, dimensional accuracy, and microstructure of the hot formed parts are analyzed to determine the influence of different processing parameters for UHSS parts formed from BR1500HS. The results indicate that the quenching time had the most significant impact on the mechanical properties of the parts, and longer quenching time resulted in better mechanical properties. In addition, the pressing speed had a significant influence on the thick ness of the formed parts, and the part-opening temperature had the most significant effect on the dimensional accura cy of the parts. And to get hot stamped parts with excellent quality, the optimum process conditions should be set as heating temperature of 930 ℃, soaking time of 4 min, stamping force of 7 MPa, pressing speed of 75 mm/s, quench ing time of 15 s, and water-flow rate of 1.1 m/s.

关键词： hot forming processing parameter mechanical property microstructure

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