Microstructures and mechanical properties of the third generation automobile steels fabricated by ART-annealing  

作　　者：CAO WenQuan WANG Chang WANG CunYu SHI Jie WANG MaoQiu DONG Han WENG YuQing 

机构地区：[1]Central Iron&Steel Research Institute(CISRI),Beijing 100081,China [2]Chinese Society for Metals,Beijing 100711,China

出　　处：《Science China(Technological Sciences)》2012年第7期1814-1822,共9页中国科学（技术科学英文版）

基　　金：supported by the National Basic Research Program of China "973 program" (Grant No. 2010CB630803)

摘　　要：The mechanical properties dependence on the microstructure was reviewed and analyzed,and the ultrafine grained duplex microstructure of BCC matrix and large fractioned austenite was given as one of the optimum structures to develop the third generation steel with high strength and high ductility.The medium-Mn steels with different carbon contents processed by austenite reverted transformation(ART-annealing) were studied thoroughly to fabricate the ultrafine duplex steels with large fractioned austenite.The lamellar typed ultrafine structure,the granular typed ultrafine duplex structure and the corresponding mechanical properties of the medium-Mn steels processed by ART-annealing were demonstrated in this paper.It was revealed that the duplex structure with large fraction of austenite and ultrafine grain structure is capable of producing steels with excellent combination of strength and ductility,i.e.,Rm A about 30-50 GPa%,which is about two times of that of the conventional automobile steels and close to that of the TWIP steels.It was concluded that the ART-annealing of the medium-Mn steels would be at least one of the promising ways to fabricate the third generation automobile steels in the near future.

关 键 词：automobile steel high strength and high ductility austenite reverted transformation（ART） m-Mn steel ultrafine grain size 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TG146.21[金属学及工艺—合金]