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Hot deformation behavior and microstructure evolution of an Fe–30Cr–2Mo ultra-pure super ferritic stainless steel

Journal of Iron and steel Research International 2021年第10期28卷 1291-1304页

作者： Yang-yang Zhu Li-kui Ning Tong-zheng Xin En-ze Liu Jian Tong Zheng Tan Yang-tao Zhou Zhi Zheng Institute of Metal Research Chinese Academy of SciencesShenyang110016LiaoningChina School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016LiaoningChina School of Materials Science and Engineering University of New South WalesSydneyNSW2052Australia

The hot deformation behavior and microstructure evolution of an Fe–30Cr–2Mo ultra-pure super ferritic stainless steel were investigated at the temperature range of 950–1150℃ and strain rate varying from 0.01 to 10 s^(−1).A strain compensated constitutive equation based on the Arrhenius-type model was established to predict the flow *** hot processing map based on the dynamic materials model was achieved to identify the optimum processing *** addition,the features of microstructure evolution combined with the processing map were systematically *** experimental results revealed that the flow stress increased with decreasing deformation temperature or increasing strain *** recovery was confirmed to be the predominant softening *** values of flow stress predicted by the strain compensated constitutive equation agreed well with the experimental *** extent of dynamic recrystallization and recrystallized grain size increased with increasing deformation temperature or decreasing strain rate,and the continuous dynamic recrystallization was attributed to be the predominant mechanism of recrystallization during hot *** optimum hot working parameters were determined to be the deformation temperature of 1070–1150℃ and strain rate of 0.1–1 s^(−1) with a peak power dissipation efficiency of 42%.

关键词： super ferritic stainless steel Hot compression Constitutive equation Processing map Microstructure evolution

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Effects of Microalloying and Heat-Treatment Temperature on the Toughness of 26Cr–3.5Mo super ferritic stainless steels

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Acta Metallurgica Sinica(English Letters) 2014年第3期27卷 407-415页

作者： Li Ma Jian Han Junqi Shen Shengsun Hu Tianjin Key Laboratory of Advanced Joining Technology Tianjin University Baosteel Research Institute Baoshan Iron & Steel Co. Ltd School of Mechanical Materials and Mechatronic EngineeringUniversity of Wollongong

The effects of Ni content and heat-treatment process on the toughness of a super ferritic stainless steel with 26 wt% Cr and 3.5 wt% Mo were investigated. It was found that with the increase of Ni content, the Charpy impact toughness improved remarkably, and transformed from cleavage brittle fracture to the most ductile fracture. There were no obvious differences between the high- and low-Ni contents on the microstructure and mechanical properties since the addition of Ni did not influence crystal structure, phase composition, and precipitation of ultra pure ferritic stainless steels. Meanwhile, the heat-treatment process was a key point to maintain a high level of toughness by optimizing structure and removing detrimental precipitation, i.e., chi phase.

关键词： super ferritic stainless steel Nickel Heat treatment Toughness

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