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Effects of rare earth on microstructure and impact toughness of low alloy Cr-Mo-V steels for hydrogenation reactor vessels

查看全文 作　　者：Zhonghua [1,2]Jiang;Pei [1,2]Wang;Dianzhong [1,2]Li;Yiyi [1,2]Li 高影响力作者 机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,72 Wenhua Road,Shenyang 110016,China;[2]School of Materials Science and Engineering,University of Science and Technology of China,72 Wenhua Road.Shenyang 110016,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2020年第42卷第10期,共14页高影响力期刊 基　　金：the National Natural Science Foundation of China[Grant No.U1708252];the Youth Innovation Promotion Association,Chinese Academy of Sciences[Grant No.2013126];Innovation Foundation of Graduate School of Institute of Metals Research,Chinese Academy of Sciences,China;LiaoNing Revitalization Talents Program[Grant No.XLYC 1807022]。 摘　　要：The effects of rare earth(RE) on the microstructure and impact toughness of low alloy Cr-Mo-V bainitic steels have been investigated where the steels have RE content of 0 to 0.048 wt.%. The results indicate that the normalized microstructures of the steels are typical granular bainite(GB) composed primarily of bainitic ferrite and martensite and/or austenite(M-A) constituents. The M-A constituents are transformed into ferrite and carbides and/or agglomerated carbides after tempering at 700℃ for 4 h. The addition of RE decreases the onset temperature of bainitic transformation and results in the formation of finer bainitic ferrite, and reduces the amount of carbon-rich M-A constituents. For the normalized and tempered samples, the ductile-to-brittle transition temperature(DBTT) decreases with increasing RE content to a critical value of 0.012 wt.%. Lower DBTT and higher upper shelf energy are attributed to the decreased effective grain size and lower amount of coarse agglomerated carbides from the decomposition of massive M-A constituents. However, the addition of RE in excess of 0.012 wt.% leads to a substantial increase in the volume fraction of large-sized inclusions, which are extremely detrimental to the impact toughness. 关 键 词：Low alloy Cr-Mo-V steel Rare earth MICROSTRUCTURE Impact toughness Granular bainite Martensite-austenite constituents
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