Stability of Retained Austenite Through a Combined Intercritical Annealing and Quenching and Partitioning(IAQP) Treatment  

作　　者：Ri-Ming Wu Wei Li Cheng-Lin Wang Yi Xiao Li Wang Xue-Jun Jin 

机构地区：[1]School of Materials Science and Engineering,Shanghai Jiao Tong University [2]School of Materials Science and Engineering,Shanghai University [3]State Key Lab of Development and Application Technology of Automotive Steels,Baosteel Research Institute

出　　处：《Acta Metallurgica Sinica(English Letters)》2015年第3期386-393,共8页金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No. 51174251);the National Basic Research Program of China (No. 2010CB630803)

摘　　要：Intercritical annealing（IA） at various temperatures followed by quenching and partitioning（IAQP） treatments was conducted on a cold-rolled Fe-0.2C-1.42Si-l.87Mn（wt%） sheet steel.Optimized microstructure and enhanced mechanical properties were achieved through appropriate adjustment of IA temperatures.The steel which was annealed at1,033 K for 600 s,then quenched to 573 K and partitioned at 693 K for 20 min,designated as 1033 QP steel,exhibits maximum 16.3 vol% retained austenite（RA） with good mechanical properties（ultimate tensile strength 886 MPa and total elongation 27%）.It was found that the thermal and mechanical stabilities of RA are mainly influenced by the combined effect of its average carbon content and amount of adjacent martensite.Furthermore,the transformation-induced plasticity effect increased the peak n-values observed at the second stage of the work hardening of IAQP steels.Intercritical annealing（IA） at various temperatures followed by quenching and partitioning（IAQP） treatments was conducted on a cold-rolled Fe-0.2C-1.42Si-l.87Mn（wt%） sheet steel.Optimized microstructure and enhanced mechanical properties were achieved through appropriate adjustment of IA temperatures.The steel which was annealed at1,033 K for 600 s,then quenched to 573 K and partitioned at 693 K for 20 min,designated as 1033 QP steel,exhibits maximum 16.3 vol% retained austenite（RA） with good mechanical properties（ultimate tensile strength 886 MPa and total elongation 27%）.It was found that the thermal and mechanical stabilities of RA are mainly influenced by the combined effect of its average carbon content and amount of adjacent martensite.Furthermore,the transformation-induced plasticity effect increased the peak n-values observed at the second stage of the work hardening of IAQP steels.

关 键 词：Intercritical annealing and quenching and partitioning treatment（IAQP） Retained austenite（RA） Average carbon content（ACC） Amount of adjacent martensite（AAM） Transformation-induced plasticity（TRIP） 

分 类 号：TG142.1[一般工业技术—材料科学与工程]