工程科学学报2016，Vol.38Issue(2)：223-229,7.DOI:10.13374/j.issn2095-9389.2016.02.010
预处理组织对低碳钢IQ&P工艺下组织及性能影响
Effect of pretreated microstructure on the morphology and mechanical properties of low-carbon steel with IQ&P treatment
摘要
Abstract
The effects of pretreated microstructure on the multiphase microstructure features at room temperature and the mechani-cal properties of low-carbon steel were studied by the treatment of water cooling after hot-rolling in the γ phase region or in the γ+αphase region followed by the treatment of intercritical reheating-quenching-partitioning ( IQ&P) . Two different pretreated microstruc-tures, which are martensite and martensite + ferrite, are obtained by the two different hot-rolling and quenching processes. After IQ&P, the steel with martensite as pretreated microstructure, in which the volume fraction of retained austenite is 8. 2%, is turned into a multi-phase structure composed of lath intercritical ferrite, block tempered martensite, needle-like untempered martensite, and retained austenite. While the steel with martensite + ferrite as pretreated microstructure, in which the volume fraction of retained austenite is 14. 3%, is turned into a multi-phase structure composed of lath intercritical ferrite, block or needle-like untempered martensite, and short needle-like or block retained austenite. With the same IQ&P process parameters, the tensile strength of the steel with martensite as pretreated microstructure is 770 MPa, the elongation is 28%, and the product of strength and elongation is 21560 MPa·%. While the tensile strength of the steel with martensite + ferrite as pretreated microstructure is 834 MPa, the elongation increases to 36. 2%, and the product of strength and elongation reaches to 30190 MPa·%. In other words, the steel has obtained a good combination of strength and ductility.关键词
低碳钢/多相钢/预处理组织/形态/力学性能Key words
low-carbon steel/multiphase steel/pretreated microstructure/morphology/mechanical properties分类
矿业与冶金引用本文复制引用
陈连生,张健杨,田亚强,宋进英,徐勇,张士宏..预处理组织对低碳钢IQ&P工艺下组织及性能影响[J].工程科学学报,2016,38(2):223-229,7.基金项目
国家自然科学基金项目资助项目(51254004, 51304186) （51254004, 51304186）
河北省自然科学基金资助项目(E2014209191) （E2014209191）
河北省教育厅科研资助项目(YQ2013003) （YQ2013003）
