Heredity Characteristic From Hot Rolled Microstructure to Annealed Microstructure in High Strength TRIP Steels

作     者：XIONG Zi-liu CAI Qing-wu JIANG Hai-tao 

作者机构：National Engineer Research Center of Advanced Rolling University of Science and Technology Beijing Beijing 100083 China 

出 版 物：《Journal of Iron and Steel Research International》 (JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL)

年 卷 期：2010年第17卷第10期

页      面：38-44页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：Item Sponsored by National Natural Science Foundation of China(50804005) National High Technology Research and Development Program(863 Program)of China(2008AA03E502) 

主　　题：TRIP steel hot roiled microstructure heredity microstructure annealing 

摘      要：The influence of hot rolled process on microstructure in TRIP （transformation induced plasticity） steel and the heredity characteristic from the hot rolled microstructure to annealed microstructure are investigated. The results show that there are two kinds of hot rolled microstructures at different coiling temperatures. One is composed of coarse grains of ferrite, pearlite and bainite, and the other is composed of small grains of ferrite, bainite and austen- ite, After annealing, the first kind of hot rolled microstructure is greatly refined, and volume fraction, and carbon content of austenite increase significantly. However, it has little changes in grain size, volume fraction and carbon content of austenite after the second kind of hot roiled sheet is annealed. There are also differences in distribution of retained austenite between the two annealed microstructures observed by EBSD and TEM technology. Retained aus- tenite in the first annealed microstructure is distributed mainly on the inside of the polygonal ferrite in the form of spot, only little retained austenite is located on bainte ferrite boundary, however retained austenite in the second an- nealing microstructure is located in several places, such as inside of polygonal ferrite, polygonal ferrite boundary, and bainte ferrite boundary.