摘要
制备了低碳贝氏体高强钢,观察了其第二相粒子的析出行为,并对该钢的综合强化机理进行了研究。结果表明,所制备的钢屈服强度达610 MPa、抗拉强度达720 MPa、伸长率为20%,低温韧性良好。此次制备的钢析出粒子有Nb（C,N）、Ti（C,N）、Ti C、Nb C等,析出粒子尺寸均较小,以粒径在50 nm以下的析出粒子最多。细晶强化对低碳贝氏体高强钢的屈服强度贡献值占比为36%;析出强化对屈服强度的贡献值占比为25%;相变强化对屈服强度的贡献值占比约为15%;固溶强化及其他强化方式对屈服强度的贡献值约占比为24%。
The low carbon bainite high strength steel was prepared. The precipitate behavior of the second phase particle was observed. The integrated reinforcement mechanism of the steel was researched. The results show that the yield strength of the prepared steel reaches 610 MPa, the tensile strength reaches 720 MPa and the elongation is 20%, and the low temperature toughness is good. The precipitated particles of the prepared steel are Nb（C, N）, Ti（C, N）, Ti C and Nb C, etc., besides, the size of the precipitated particles is small and most of them are less than 50 nm. The yield strength contribution of fine grain to low carbon bainite high-strength steel is 36%, and the contribution of precipitation strengthening to yield strength is 25%. The contribution of phase change reinforcement to yield strength is about 15% and the contribution of solid solution strengthening and other strengthening methods is 24%.
作者
唐兴昌
王向飞
张志坚
TANG Xingchang;WANG Xiangfei;ZHANG Zhijian(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou 730050,China)
出处
《热加工工艺》
CSCD
北大核心
2018年第16期92-96,共5页
Hot Working Technology
关键词
低碳贝氏体
高强钢
析出行为
强化机理
low carbon bainite
high strength steel
precipitation behavior
strengthening mechanism
