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Journal of Iron and Steel Research International 2015年第1期22卷 42-47页

作者： Chang WANG Wen-quan CAO Yun HAN Cun-yu WANG Chong-xiang HUANG Han DONG Central Iron and Steel Research Institute Shougang Research Institute of Technology School of Aeronautics and Astronautics Sichuan University

A duplex ultrafine microstructure in a medium manganese steel （0.2C-5Mn） was produced by austenite re- verted transformation annealing （ART-annealing）. The microstructural evolution during annealing was examined by scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and X-ray diffraction （XRD）. Based on the microstructure examination, it was found that some M3C type carbides appeared in the martensitic matrix at the beginning of the ART-annealing. But with further increasing annealing time, these carbides would be dissolved and finally disappeared. Meanwhile, the austenite lath was developed in the ART-annealing process and the volume fraction of austenite increosed with the increase of the annealing time, which resulted in a duplex microstructure con- sisting of ultrafine-grained ferrite and large fraction of reverted austenite after long time annealing. The mechanical property examinations by uniaxial tensile tests showed that ART-annealing （6 h, 650 ℃） resulted in a superhigh product of strength to elongation up to 42 GPa ·%.

关键词： medium Mn steel microstructure mechanical property austenization annealing

Influence of austenization temperature on the erosion behavior of austempered ductile irons

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Journal of University of Science and Technology Beijing 2008年第1期15卷 29-33页

作者： L.C. Chang L C. Hsui L.H. Chen S.T. Lui Department of Mechanical Engineering Technology and Science Institute of Northern Taiwan Taipei 112 China Talpei Department of Materials Science and Engineering Cheng-Kung University Talnan 800 China Taipei

The erosion behavior of austempered ductile irons austenized at different temperatures was studied. The results indicate that the erosion rate well correlates with the mechanical properties. At high impact angles, increasing ductility and mechanical energy density results in decreasing erosion rate, whereas increasing hardness reduces the erosion rate at low impact angles. 2008 University of Science and Technology Beijing. All rights reserved.

关键词： austempered ductile iron erosion mechanical properties austenization

EFFECT OF ELECTRIC FIELD ON THE austenization OF A LOW CARBON STEEL

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Acta Metallurgica Sinica(English Letters) 2004年第5期17卷 689-693页

作者： X.T.Liu J.Z.Cui TheKeyLaboratoryofElectromagneticProcessingofMaterials MinistryofEducationNortheasternUniversityShenyang110004China

With an electric field during austenitizing, the martensite transformation of the low carbon steel was promoted, and more martensite were obtained. The electric field promotes the homogeneity of carbon, and reduces the free energy of austenite. The critical neuclus r* and the critical driving force G* responsible for the nucleation of proeutectoid ferrite were increased. As a result of which the diffusion controlled proeuctoid ferrite transformation was retarded and the hardenability was improved.

关键词： austenization electric field proeutectoid ferrite hardenability

Effect of continuous annealing parameters on the mechanical properties and microstructures of a cold rolled dual phase steel

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International Journal of Minerals,Metallurgy and Materials 2009年第2期16卷 159-164页

作者： Shuang Kuang Yong-lin Kang Hao Yu Ren-dong Liu School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Technology Center Anshan Iron ＆ Steel Group Corporation Anshan 114001 China

A cold rolled dual phase （DP） steel with the C-Si-Mn alloy system was trial-produced in the laboratory, utilizing a Gleeble-3800 thermal simulator. The effects of continuous annealing parameters on the mechanical properties and microstructures of the DP steel were investigated by mechanical testing and microstructure observation. The results show that soaking between 760 and 820℃ for more than 80 s, rapid cooling at the rate of more than 30℃/s from the quenching temperature between 620 and 680℃, and overaging lower than 300℃ are beneficial for the mechanical properties of DP steels. An appropriate proportion of the two phases is one of the key factors for the favorable properties of DP steels. If the volume fraction of martensite and, thereby, free dislocations are deficient, the tensile strength and n value of DP steels will decrease, whereas, the yield strength will increase. But if the volume fraction of martensite is excessive to make it become a dominant phase, the yield and tensile strength will increase, whereas, the elongation will decrease obviously. When rapid cooling rate is not fast enough, pearlite or cementite will appear, which will degrade the mechanical properties. Even though martensite is sufficient, if it is decomposed in high temperature tempering, the properties will he unsatisfied.

关键词： austenization intercritical annealing dual phase steel cold rolling diffusion

Cellular automaton modeling of austenite formation from ferrite plus pearlite microstructures during intercritical annealing of a C-Mn steel

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Journal of Materials Science & Technology 2020年第12期47卷 1-9页

作者： Chunni Jia Chengwu Zheng Dianzhong Li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences.Shenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China

A mesoscopic cellular automaton model was developed to study the microstructure evolution and solute redistribution of austenization during intercritical annealing of a C-Mn steel. This model enables a depiction of three-stage kinetics of the transformation combined with the thermodynamic analysis:(1) the rapid austenite growth accompanied with pearlite degeneration until the pearlite dissolves completely;(2) the slower austenite growth into ferrite with a rate limiting factor of carbon diffusion in austenite;and(3) the slow austenite growth in control of the manganese diffusion until the final equilibrium reached for ferrite and austenite. The effect of the annealing temperature on the transformation kinetics and solute partition is also quantitatively rationalized using this model.

关键词： austenization Intercritical annealing C-Mn steels Cellular automaton Mesoscale modeling

Austenite Grain Refinement and Isothermal Growth Behavior in a Low Carbon Vanadium Microalloyed Steel

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Journal of Iron and Steel Research International 2014年第8期21卷 757-764页

作者： Geng-wei YANG Xin-jun SUN Qi-long YONG Zhao-dong LI Xiao-xian LI Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and Technology Department of Structural Steel Central Iron and Steel Research Institute Department of Materials Science and Engineering Kunming University of Science and Technology

The austenite grain refinement through control of the grain growth during reheating process after thermomechanical controlled process （TMCP） in a vanadium microalloyed steel was achieved. The formation of ultra-fine grained austenite was attributed to the high density of austenite nucleation at the ferrite/martensite structure and to the inhibition of austenite growth by （Ti~ V）C particles at the relatively low reheating temperature. Corresponding with the precipitation behavior of （Ti,V）C with temperature, the growth behavior of austenite in the vanadium mi- croalloyed steel could be divided into two regions. At lower reheating temperature, austenite grains grew slowly, and ultra-fine grained austenite smaller than 5 ~m was successfully obtained. By contrast, the austenite grains grew rap- idly at high temperature due to the dissolution of （Ti, V）C particles. According to the measured and predicted results of austenite growth kinetics, two models were developed to describe the growth behavior of austenite grains in two different temperature regions, and the apparent activation energy Qapp for grain growth was estimated to be about 115 and 195 kJ/mol, respectively.

关键词： grain refinement austenization (Ti, V) C precipitationl grain growth austenite