Carbides and mechanical properties in a Fe-Cr-Ni-Mo high-strength steel with different V contents

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• 作者：Tao Wen ; Xiaofeng Hu ; Yuanyuan Song ; Desheng Yan ; Lijian Rong
• 关键词：High-strength steel ; Vanadium ; Carbides ; Mechanical properties
• 刊名：Materials Science and Engineering: A
• 出版年：20 December, 2013
• 年：2013
• 卷：588
• 期：Complete
• 页码：201-207
• 全文大小：5942 K

文摘

Fe-Cr-Ni-Mo high-strength steels with four different V contents (0%, 0.03%, 0.08% and 0.14%) were prepared in this paper and carbides evolution was investigated by means of three-dimensional atom probe (3DAP) and transmission electron microscopy (TEM). The results indicated that there appeared MC, M₂C and M₆C types of carbides after addition of V in the steels while it was M₂₃C₆ in 0.0%V steel (M is any combination of Cr, Mo, Mn, Fe or V), and the size of carbides decreased gradually with improving V content. The mechanical properties significantly depended on the content of V. The strength and elongation increased gradually with increase in the V content, meanwhile the impact toughness decreased gradually. The excellent combination of mechanical properties can be obtained in the steel with about 0.03%鈥擵 content.