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Effect of Annealing Treatment on Precipitates and Tensile Properties of FeCoCrNiVN High-Entropy Alloy Produced by Twin-Roll Casting

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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE 2024年第7期33卷 3374-3383页

作者： Ran, Rong Zhang, Yuan-xiang Wang, Yang Wang, Guo-dong Northeastern Univ State Key Lab Rolling & Automation RAL Shenyang 110819 Peoples R China

In the present work, an as-cast strip of novel high entropy alloy (Fe48.8Co26.9Cr9.7Ni5.7V8.3N0.6 at.%) was successfully produced by twin-roll casting technology. Then, the as-cast strip with or without primary annealing was cold-rolled and annealed. The directly cold-rolled and annealed samples consisted of single-phase FCC and they were easier to recrystallize. While many granular VN particles precipitated during primary annealing. Besides, after secondary annealing, the dual phases microstructure of FCC+BCC was obtained. The BCC phase made the alloy have high recrystallization resistance and inhibited grains growth, causing refined grains in secondary annealed samples. The grain size was refined to 1.26 mu m when annealed at 800 degrees C, the corresponding recrystallization fraction was only 60.9%. When annealing at 1000 degrees C, the content of BCC decreased, resulting in larger grain size (similar to 8.13 mu m) and fully recrystallized structure. The secondary annealed sheets showed excellent tensile properties, the ultimate tensile strengths were 770-898 MPa and corresponding total elongations were 32-46%.

关键词： high entropy alloy recrystallization tensile behavior twin-roll casting

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The Prediction of the Mechanical Properties for Hot-Rolled Nb Micro-Alloyed Dual-Phase Steel Based on Microstructure Characteristics

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JOM 2023年第7期75卷 2225-2234页

作者： Li, Xin Zhou, Xiaoguang Jiang, Qiming Liu, Zhenyu Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China

Because wheel manufacturing requires dual-phase (DP) 590 steel with different thickness specifications, it is necessary to produce DP590 steel with good mechanical property stability through a controlled cooling process. According to the volume fraction of ferrite and martensite and the grain size of ferrite in DP590 steel with different plate thicknesses under industrial production conditions, the effects of strengthening and toughening mechanisms, such as fine grain strengthening and phase transformation strengthening, on mechanical properties are considered, and a prediction model of the microstructure-property relationship of DP590 steel is established. On this basis, the effects of thickness and processing parameters on the grain size and fraction of ferrite are analyzed, which show that the evolution of ferrite accord with physical metallurgy principles. Three DP590 steels are rolled by using the established microstructure-property relationship model, and the results show that the predicted results of the model are in good agreement with the experimental values.

关键词： Ferrite

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Effect of pouring time on microstructure and mechanical properties of centrifugal cast Ti-46Al alloy tubes

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China Foundry 2025年第1期22卷 65-74页

作者： Gang Huang Qian Dang Cong-cong Su Jing Zhao Chi Zhang Guo-huai Liu Zhao-dong Wang The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

The grain size of TiAl alloy castings prepared by traditional casting process is coarse,thus showing poor mechanical *** this study,a new type of high performance Ti-46Al alloy tube prepared by vacuum centrifugal casting technology was *** research comprehensively examined the influence of pouring time on the microstructure and mechanical performance of the castings,employing both experimental approaches and ProCast simulation *** findings indicate that prolonging the pouring time facilitates a microstructural evolution from coarse columnar grains to refined equiaxed *** the condition of pouring temperature of 1,600℃,rotation speed of 800 r·min^(-1) and pouring time of 6 s,the tensile strength of Ti-46Al alloy at room temperature reaches 650 MPa,and the tensile strength at 800℃ reaches 705 MPa,which is significantly higher than that of traditional as-cast Ti-Al alloy.

关键词： vacuum induction melting centrifugal casting Ti-46Al alloy pouring time Ti-Al alloy tubes

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Optimum Wear Resistance Achieved by Balancing Bulk Hardness and Work-Hardening: A Case Study in Austenitic Stainless Steels

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TRIBOLOGY LETTERS 2023年第1期71卷 1-12页

作者： Zhang, Hengyi Wang, Lingyu Hu, Jun Wang, Guodong Xu, Wei Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China

Wear, which exists in all industries and walks of life, causes tremendous economic losses and even major disasters. To prevent damage caused by wear, Archard's theory suggests the use of materials with higher hardness. However, such materials are minimally formable and difficult to manufacture. Recent studies have reported that strain hardening is another factor that significantly affects wear resistance. In this study, to investigate the relative potential of each of these factors and examine the balance between the hardness and work-hardening properties under various working conditions, we selected 321 austenitic stainless steel as a candidate material. Cold-rolling, which improves the base strength of the material, was used to develop strain-induced alpha & PRIME;-martensite. Simultaneously, the strain-hardening capability of the material was decreased. The wear resistance and corresponding failure mechanisms were evaluated using the ball-on-disc test under various loading conditions. The results indicate that wear resistance depends on the bulk hardness and loading conditions used. A series of microstructural analyses revealed that the wear resistance is closely related to the base strength and hardening capability of the material. Therefore, this study establishes an optimum hardness-strain hardening balance and elucidates the design of low-hardness, high-wear-resistance materials for future applications.

关键词： Wear resistance Initial a' -martensite Bulk hardness Work-hardening

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Enhancing strength and ductility in the nugget zone of friction stir welded 7Mn steel via tailoring austenitic stability

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Journal of Materials Science & technology 2024年第18期185卷 174-185页

作者： Y.Q.Wang F.Y.Li J.X.Su R.H.Duan Z.A.Luo G.M.Xie State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

The martensite often appears in the nugget zone(NZ)of friction stir welding(FSW)7 wt.%Mn steel due to low austenite stability,deteriorating ductility and *** this work,a 7 wt.%Mn steel was sub-jected to FSW,and preheating was used to tailor the austenitic stability to greatly improve the strength-ductility combination of the *** austenitic deformation behavior and strain hardening mechanism in the NZ were systematically *** microstructure of the as-welded NZ was composed of ultrafine blocky ferrite,austenite,and small amounts of martensite,whereas the as-preheated NZ con-tained ultrafine blocky ferrite and austenite,and the concentration of Mn in austenite was increased from 8.4 wt.%to 10.7 wt.%.This enhanced the austenitic stability,resulting in a significant increase in the volume fraction of austenite in the as-preheated NZ from 37.3%to 66.4%.The product of strength and elongation(PSE)in the as-preheated NZ increased dramatically from 42.6 GPa%to 67.1 GPa%,depending on a persistent high strain hardening rate(SHR).Multiple strain-hardening mechanisms were *** austenite with enhanced stability can provoke sustained transformation-induced plasticity(TRIP)and twinning-induced plasticity(TWIP)effects,and massive dislocation multiplication occurs during tension,resulting in strong strain hardening.

关键词： Friction stir welding Medium Mn steel Preheating Transformation-induced plasticity Twinning-induced plasticity

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Calculation of Calcium Ion Activity in the CaF2-Al2O3-CaO-SiO2-MgO Slag System and Its Impact on Calcium Content in Steel

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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE 2025年第3期56卷 3187-3202页

作者： Li, Yi-Ming Tian, Jia-Long Jiang, Zhou-Hua Northeastern Univ Sch Met Shenyang 110819 Peoples R China Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China

This study aims to control the increase of calcium content in ingots during the electroslag remelting (ESR) process by designing suitable slag compositions. Analysis of industrial data using machine learning identified calcium ion activity in slag and electrode melting rate as the key factors influencing ingot calcium content. Based on industrial practice, a CaF2-Al2O3-CaO-SiO2-MgO slag system generated 138,347 slag combinations. Using thermodynamic data and MICT, slag compositions with lower calcium ion activity were identified while maintaining stable melting points, viscosity, and conductivity. ESR experiments with 1.2343 mold steel confirmed that lower calcium ion activity in slag reduces calcium content in ingots, leading to the development of a slag composition (Model-3) with minimal calcium-increasing potential. These results confirmed the correlation between slag calcium ion activity and ingot calcium content, validating MICT's reliability in predicting slag calcium ion activity. To further investigate the effects of slag components, 138,347 slag compositions were ranked on a scale of 0 to 10 based on calcium ion activity, deriving interaction coefficients among the components. A predictive equation for ingot calcium content was also developed, accurately forecasting calcium levels in ESR ingots for various slag compositions and melting rates in 5 to 15 tons furnaces.

关键词： Electroslag remelting

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Prediction model for austenite grain size in CGHAZ of TiN-containing steel: considering minimum pinning force and austenite coarsening dynamics

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JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL 2025年 1-15页

作者： Hao, Jun-jie Wang, Chao Duan, Hua Yan, Zhu Yuan, Guo Wang, Guo-dong Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Liaoning Peoples R China

A metallurgical model for austenite coarsening in the coarse-grained heat-affected zone (CGHAZ) containing titanium nitride (TiN) precipitation was studied. Unlike traditional methods estimating pinning capability based on the precipitation size after welding, a proposed dissolution and coarsening model was applied to study the changes in TiN precipitation size and the associated pinning forces. The transmission electron microscope was used to analyze the size distribution of TiN particles before and after the welding thermal cycle. The size distribution showed a log-normal distribution before the thermal cycle. The prediction of post-thermal cycle size distributions with the proposed model was in agreement with the experimental results. Considering the short holding time at high temperature during welding, the thermodynamic stability conditions required for limiting grain size model cannot be achieved. A simple kinetic model for the prediction of austenite grain size in CGHAZ was established. Finally, the predicted austenite grain sizes agree better with experimental results than the conventional approach.

关键词： Coarse-grained heat-affected zone High heat input welding Limiting grain size In situ method Pinning force

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Modeling flow stress and grain size of GCr15 bearing steel at hightemperature deformation near end of solidification

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Journal of Iron and Steel Research International 2023年第1期30卷 88-101页

作者： Rui-hao Li Hai-jun Li Ning Xiang Guo-dong Wang Li-juan Bai The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina HBIS Group Technology Research Institute Shijiazhuang 050000HebeiChina

Hot-core heavy reduction rolling is an innovative technology for continuous casting billet at the end of *** deformation characteristics of GCr15 bearing billet were investigated over the temperature range of 1000-1300℃ with the strain rate of 0.001-10 s^(-1) by the Gleeble 3800 thermo-mechanical ***,the true stress-strain data are calibrated by the friction correction method to acquire accurate parameters near the ***,the Laasraoui-type constitutive model and dynamic austenite grain size model are established by the thermal compression results and corrosion experimental results,and the predicted values of the experimental interval are obtained by using the ***,the accuracy of models is verified by comparing the predicted curves with the experimental *** but not the least,the dynamic parameters between solidus and liquidus are predicted by the two models,and the difficulty of experimental collecting near the melting point is solved.

关键词： Hot-core heavy reduction rolling High-temperature deformation GCr15 bearing billet Dynamic recrystallization Dynamic grain model

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Solidification microstructure of Ti-43Al alloy by twin-roll strip casting

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China Foundry 2023年第2期20卷 99-107页

作者： Yang Chen Guo-huai Liu Ye Wang Zhao-dong Wang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China College of Material Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150080China

As a near-net-shape technology,the twin-roll strip casting(TRC)process can be considered to apply to the fabrication of TiAl alloy ***,the control of the grain distribution is very important in strip casting because the mechanical properties of strips are directly determined by the solidification microstructure.A three-dimensional(3D)cellular automation finite-element(CAFE)model based on ProCAST software was established to simulate the solidification microstructure of Ti-43Al ***,the influence of casting temperature and the maximum nucleation density(nmax)on the solidification microstructure was investigated in *** simulation results provide a good explanation and prediction for the solidification microstructure in the molten pool before leaving the kissing *** and simulated microstructure show the common texture<001>orientation in the columnar grains ***,the microstructure evolution of the Ti-43Al alloy was analyzed and the solidification phase transformation path during the TSC process was determined,i.e.,L→L+β→β→β+α→α+γ+β/B2 phase under a faster cooling rate and L→L+β→β→β+α→γ+lamellar(α_(2)+γ)+β/B2 phase under a slower cooling rate.

关键词： TiAl alloy simulation microstructure strip casting solidification

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Microstructure Characteristics and Elevated Temperature Mechanical Properties of a B Containedβ-solidifiedγ-TiAl Alloy

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Journal of Wuhan University of technology(Materials Science) 2024年第3期39卷 738-746页

作者：王秀琦 GUO Ruiqi 刘国怀 LI Tianrui YANG Yuxuan CHEN Yang XIN Meiling WANG Zhaodong State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China School of Materials Science and Engineering Harbin Institute of Technology at ShenzhenShenzhen 518055China School of Metallurgical Engineering Anhui University of TechnologyMaanshan 243000China

The improved microstructure and enhanced elevated temperature mechanical properties of Ti-44Al-5Nb-(Mo,V,B)alloys were obtained by vacuum arc re-melting(VAR)and primary annealing heat treatment(HT)of 1260℃/6 h/Furnace cooling(FC).The phase transformation,microstructure evolution and tensile properties for as-cast and HTed alloys were *** indicate that three main phase transformation points are determined,T_(eut)=1164.3℃,T_(γsolv)=1268.3℃and T_(βtrans)=1382.8℃.There are coarse lamellar colonies(300μm in length)and neighbor reticular B2 andγgrain(3-5μm)in as-cast alloy,while lamellar colonies are markedly refined and multi-oriented(20-50μm)as well as the volume fraction and grain sizes of equiaxedγand B2 phases(about 15μm)significantly increase in as-HTed *** transformations involvingα+γ→α+γ+β/B2 and discontinuousγcoarsening contribute to the above ***(1-3μm)act as nucleation sites forβ_(eutectic) and produce massiveβgrains with different orientations,thus effectively refining the lamellar colonies and forming homogeneous multi-phase *** curves show both the alloys exhibit suitable performance at 800℃.As-cast alloy shows a higher ultimate tensile stress of 647 MPa,while a better total elongation of more than 41%is obtained for as-HTed *** mechanical properties improvement is mainly attributed to fine,multi-oriented lamellar colonies,coordinated deformation of homogeneous multi-phase microstructure and borides within lamellar interface preventing crack propagation.

关键词： TiAl alloy phase transformation heat treatment boride microstructure mechanical properties

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