500MPa超级钢的强化方式与显微组织
Strengthening Mechanism and Microstructure of 500 MPa Ultra-fine Grain Steels
摘 要
以两种不同成分的低碳钢为研究对象,通过工业轧制及不同工艺的实验室热轧使材料获得不同的显微组织,对其力学性能及显微组织进行了分析研究.结果表明:在晶粒为3 μm左右的铁素体基体上引入5%~10%的贝氏体,对屈服强度影响不大,但可以使抗拉强度提高20 MPa;添加0.02%的铌,并通过合适的轧制工艺,可以改善细晶强化和沉淀强化的效果,使屈服强度达到520 MPa以上,抗拉强度达到620 MPa以上.500 MPa超细晶钢的强化方式应以细晶强化为主,配合相变强化和沉淀强化,显微组织应为在超细(3~5 μm)的铁素体基体上分布适量的贝氏体.
晶粒细化
铁素体
贝氏体
low-carbon steel
grain refinement
ferrite
bainite
Abstract
The industrial test and lab rolling tests were carried out for two low carbon steels.The samples with different microstructures were obtained and the strengthening mechanism and microstructures through which the products could obtain good mechanical properties were investigated.Introducing 5%-10% bainite in the matrix of ultra-fine ferrite could make the tensile strength increase about 20 MPa.The yield strength and tensile strength could be increased to more than 520 MPa and 620 MPa,respectively,through addition of 0.02% Nb and suitable TMCP process refinement strengthening was enhanced and precipitation strengthening was also introduced.The strengthening mechanisms for 500 MPa ultra-fine grain steels should be grain refinement strengthening,transformation strengthening and precipitation strengthening.
中图分类号 TG142.31 TG113.12
所属栏目
基金项目 国家高技术研究发展(973)计划资助项目(2003AAG010)
收稿日期 2005/4/25
修改稿日期 2005/7/20
网络出版日期
作者单位点击查看
备注杜林秀(1962-),男,辽宁本溪人,教授,博士.
引用该论文: DU Lin-xiu,SUN Jian-lun,YANG Hai-feng,ZHANG Wan-shan,LIU Xiang-hua,WANG Guo-dong. Strengthening Mechanism and Microstructure of 500 MPa Ultra-fine Grain Steels[J]. Materials for mechancial engineering, 2006, 30(6): 30～33
杜林秀,孙建伦,杨海峰,张万山,刘相华,王国栋. 500MPa超级钢的强化方式与显微组织[J]. 机械工程材料, 2006, 30(6): 30～33
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