Microstructure and Mechanical Properties of Hot Rolled Low Silicon TRIP Steel Containing Phosphorus and Vanadium  

作　　者：HOU Xiao-ying XU Yun-bo ZHAO Yan-feng WU Di 

机构地区：[1]State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China

出　　处：《Journal of Iron and Steel Research International》2011年第11期40-45,共6页

基　　金：Item Sponsored by National Natural Science Foundation of China (50734001,51174059,50971039);Fundamental Research Funds for Central Universities of China (N090407001)

摘　　要：The microstructure characteristics and mechanical properties of a low-silicon TRIP steel containing phosphorus and vanadium at different finish rolling temperatures were studied by laboratory hot rolling experiments. Dif- ferent ratios of multiphase microstructure （ferrite, granular bainite and retained austenite） are obtained. With a decrease in finish rolling temperature, the volume fractions of ferrite and retained austenite increase. EBSD analysis re veals that most of the ferrite grains are fine, and decreasing of finish rolling temperature leads to an increase in low angle boundaries. Under the joint effects of fine grain strengthening, dislocation strengthening and precipitation strengthening, higher strength is obtained. When the finish rolling temperature is decreased to 800 ℃, the steel has excellent mechanical properties： Rp0.2 =470 MPa; Rm=960 MPa; Rp0. 2/Rm=0. 49; A50 =19.7%; n=0. 25.The microstructure characteristics and mechanical properties of a low-silicon TRIP steel containing phosphorus and vanadium at different finish rolling temperatures were studied by laboratory hot rolling experiments. Dif- ferent ratios of multiphase microstructure （ferrite, granular bainite and retained austenite） are obtained. With a decrease in finish rolling temperature, the volume fractions of ferrite and retained austenite increase. EBSD analysis re veals that most of the ferrite grains are fine, and decreasing of finish rolling temperature leads to an increase in low angle boundaries. Under the joint effects of fine grain strengthening, dislocation strengthening and precipitation strengthening, higher strength is obtained. When the finish rolling temperature is decreased to 800 ℃, the steel has excellent mechanical properties： Rp0.2 =470 MPa; Rm=960 MPa; Rp0. 2/Rm=0. 49; A50 =19.7%; n=0. 25.

关 键 词：hot rolling low silicons TRIP steel PHOSPHORUS VANADIUM EBSD precipitation 

分 类 号：TG146.21[一般工业技术—材料科学与工程] U465.11[金属学及工艺—金属材料]