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Effect of mn content on microstructure, tensile and impact properties of SA508Gr.4N steel for reactor pressure vessel

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Journal of Iron and Steel Research International 2020年第4期27卷 461-470页

作者： Xi-kou He Zhi-qiang Yang Zhen Wang Shi-bin Qiao Zheng-dong Liu Institute for Special Steels Central Iron and Steel Research InstituteBeijing 100081China Technology Center of Ma’anshan Iron and Steel Co. Ltd.Ma’anshan 243000AnhuiChina

The effect of manganese(mn)on the microstructure,tensile and impact properties of SA508Gr.4N steel has been experimentally *** influence of mn content on the substructure of SA508Gr.4N steel was investigated using the scanning electron microscope,electron back-scattered diffractometer and transmission electron *** was found that the increased mn content had a beneficial effect on both strength and *** of microstructure revealed smaller size of block and larger number of high-angle grain boundaries with higher mn *** change of the ultimate tensile strength and toughness with increasing mn content was attributed to the increased hardenability,the number of high-angle grain boundaries and the crack propagation path by the block refining.

关键词： mn element SA508Gr.4N steel Microstructure Charpy impact toughness Substructure

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Investigation on microstructures and mechanical properties of Mg-6Zn-0.5Ce-xmn(x=0 and 1)wrought magnesium alloys

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Journal of Magnesium and Alloys 2022年第4期10卷 993-1003页

作者： Caihong Hou Hongshuai Cao Fugang Qi Qing Wang Lianhui Li Nie Zhao Dingfei Zhang Xiaoping Ouyang School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105PR China China Railway Eryuan Engineering Group Co.Ltd. Chengdu 610000PR China College of Materials Science and Engineering Chongqing UniversityChongqing 400045PR China

The microstructure evolution and mechanical properties of Mg–6Zn–0.5Ce–xmn(x=0 and 1 wt.%)wrought magnesium alloys were researched,and the morphologies and role of mn element in the experimental alloys were *** research shows that all of mn elements form theα-mn pure phases,which do not participate in the formation of other phases,such as theτ-*** mechanical properties of mn-containing alloys in as-extruded and aged states are superior to mn-free *** the hot extrusion process,the dispersed fineα-mn particle phase hinders the migration of grain boundaries and inhibits dynamic recrystallization,which mainly takes effect of grain refining and dispersion *** the aging treatments,the dispersed fineα-mn particle phase not only hinders the growth of the solution-treated grains,but also becomes the nucleation cores ofβ1 rod-like precipitate phase,which is conducive to increasing the nucleation rate of the precipitate *** the aged alloy,the mn addition mainly takes effect of grain refining and promoting aging strengthening.

关键词： Mg–6Zn–0.5Ce alloy Microstructure evolution Mechanical property mn element Aging precipitation

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