Effect of Intercritical Annealing on Retained Austenite and Properties of a Low Carbon 3Mn Steel
The influences of intercritical annealing temperature and time on retained austenite and properties were investigated in a low carbon low alloy steel containing 3wt% Mn.Results showed that the multi-phase microstructures consisted of intercritical ferrite,martensite/bainite,retained austenite and fine dispersed precipitations.The volume fraction of retained austenite reached a maximum value of 14% after intercritical annealing at 680℃ for 30 min.Retained austenite was stabilized by the intercritical partition of Mn and Ni into the reverted austenite.The partition behaviors of Mn,Ni during intercitical annealing were studied by STEM and analyzed by DICTRA simulation.Due to the combined contribution results from retained austenite and nanoscale precipitation,excellent properties of high yield strength (751 MPa),low yield to tensile ratio (0.77) and ductility (12% and 25% in uniform and total elongation) were achieved at 680℃ for 30 min.
intercritical annealing multi-phase microstructure retained austenite nanoscale precipitate
XIE Zhenjia SHANG Chengjia
Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing, Beijing 100083, China
国际会议
成都
英文
243-246
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）