【摘要】 研究了0.21C--1.43Si--1.35Mn钢在两相区及完全奥氏体区采用Q&P(Quenching and Partitioning)工艺加热后的微观组织与力学性能.结果表明:两相区加热可获得马氏体、残余奥氏体和铁素体组织,钢的抗拉强度为1 013 MPa,延伸率为25%,强塑积为25 655 MPa.%;完全奥氏体区加热可获得马氏体和残余奥氏体组织,钢的抗拉强度为1 257 MPa,延伸率为17%,强塑积为21 454 MPa.%;Q&P钢中的马氏体主要为板条状,伴有大量位错,并且发现有少量孪晶马氏体,分析认为由配分过程后的淬火过程转变而来;通过Q&P工艺可得到体积分数高达10.67%的残余奥氏体,分布在板条马氏体间,呈薄膜状.更多还原

【Abstract】 The microstructure and mechanical properties of 0.21C-1.43Si-1.35Mn steel heated by a quenching and partitioning(Q&P) process in the two-phase region and the full austenite region were investigated.The results show that if heating the steel in the two-phase region,the microstructure consists of martensite,retained austenite and ferrite,and the tensile strength,elongation and strength ductility are 1 013 MPa,25% and 25 655 MPa·%,respectively.While heating the steel in the full austenite region,the microstructure consists of martensite and retained austenite,and the tensile strength,elongation and strength ductility are 1 257 MPa,17% and 21 454 MPa·%,respectively.There is mainly lath martensite along with high-density dislocations in the Q&P steel.A few twinning martensite transformed after partitioning can be observed as well.Retained austenite with a volume fraction of 10.67%,distributed within lath martensite,can be acquired in the shape of films after the Q&P process.更多还原