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采用场发扫描电镜、X射线衍射仪和拉伸实验研究了不同的奥氏体化保温时间对双相区保温+Q&P热处理和Q&P热处理两种工艺的组织和性能。结果表明:经Q&P热处理的实验用钢,在奥氏体区保温60 s时,得到的组织为马氏体+铁素体+残余奥氏体;经过双相区保温+Q&P热处理,奥氏体区保温60 s时,得到的组织为马氏体+残余奥氏体,随保温时间的延长,两种热处理工艺得到的组织均为马氏体+残余奥氏体;随奥氏体区保温时间的延长,Q&P热处理和双相区保温+Q&P热处理抗拉强度均呈先升高后降低的趋势,伸长率均逐渐降低。其中在奥氏体保温60 s时,双相区保温+Q&P热处理得到的强塑性最好。
The microstructures and properties of two processes of heat preservation, Q & P heat treatment and Q & P heat treatment were studied by field emission scanning electron microscopy, X-ray diffraction and tensile test. The results show that the microstructure of martensite + ferrite + retained austenite obtained by Q & P heat treatment at 60 s in the austenite region is the same as that of austenite The microstructure was martensite + retained austenite at 60 s, and the microstructure of the two heat treatments was martensite + retained austenite with the increase of holding time. With the austenite holding time , The tensile strength of Q & P heat treatment and heat preservation of duplex phase + Q & P heat treatment all increased first and then decreased, and the elongation decreased gradually. Among them, 60 seconds austenite insulation, dual phase insulation + Q & P heat treatment obtained the best plasticity.