Effects of Si and Cr on microstructure and mechanical properties of ultra high strength dual-phase steel
YE Jie-yun1， ZHAO Zheng-zhi2， ZHANG Ying-hui1， QI Liang1
1. School of Material Science and Engineering， Jiangxi University of Science and Technology， Ganzhou 341000， Jiangxi， China 2. Engineering Research Institute， University of Science and Technology of Beijing，Beijing 100083， China
Abstract：The effects of Cr and Si on the transformation of C-Cr-Mn-Nb and C-Si-Mn-Nb ultra-high strength dual phase steels were analyzed by using thermal dilatometer. The microstructure properties and the fracture surfaces of the steels were tested by tensile tests， optical microscopy， scanning electron microscopy and transmission electron microscope. The results show that the addition of Si can increase the temperature of [Ac1]and[Ac3]， enlarge the two phase region， promote the ferrite transformation， increase the aging stability of martensite and improve its morphology and distribution; the addition of Cr leads to the uneven distribution of C in austenite， the appearance of lamellar and parallel twin microstructure， as well as the appearance of residual austenite and the M/A in the fast cooling stage and the decomposition of some martensite in overaging stage. Although tensile strength and elongation of the two steels both exceed 1 000 MPa and 15% respectively， the comprehensive mechanical properties of DP steel containing Si are superior to that containing Cr.
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2015, Vol. 50 
