低硅TRIP 钢的力学性能及残余奥氏体稳定性研究 - 材料工程.PDF

72 / 2010 4 TRIP Mechanical Property and Retained Austenite of Low-Si T RIP St eel , , , , ( , 10008 ) DING Wei, JIANG Hai-tao, T ANG Di, TIAN Zh-i qiang, YIN An-min ( National Engineering Research Center for Advanced Rolling T echnology, University of Science and T echnology Beijing, Beijing 10008 , China) : SiTRIP , ( SEM) X ( XRD) (EBSD) ( TEM) SiTRIP : SiTRIP , , , TRIP , : T RIP ; ; ; : T G 142. 1 : A : 1001-4 81(2010) 04-0072-04 Abstract: T he mechanical properties and w ork-hardening characteristics of A low-Si TRIP steel w ere researched by the tensile test. T he change of structure before and after tensile test, especially the change of retained austenite, w ere studied w ith scanning electron microscope ( SEM) , X-ray diffrac- tion ( XRD) , electron back-scattered diffraction ( EBSD) and transmission electron microscope (TEM) . The results show that the low-Si TRIP steel has good mechanical properties, no yield point and possess of low yield ratio, meantime it has better extensibility and homogeneous strain than DP steel. Retained austenite distribution also affects the stability of the low-Si T RIP steel, retained aus- tenite in ferrite grain still exists after the tensile test. Key words: low-Si T RIP steel; mechanical property; w ork-hardening; retained austenite TRIP(T ransformation Induced Plasticity) , , , , Si TRIP , , , , , , , 1 [ 1] TRIP , 1. 1 实验材料 , 1 [ 2] 70mm , 1200 C-Mn-Si TRIP , Si (