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用热冲压模具研究了超高强度钢30CrMnSi2Nb热冲压配分工艺,测试了两步法淬火和配分处理工艺对超高强度钢的组织演变和强塑性能的影响规律。利用光学电镜(OM)、扫描电镜(SEM)进行了微观组织观察,用X射线衍射仪(XRD)研究了残余奥氏体含量的变化规律。结果表明:热成形配分工艺可明显提高钢的塑性和强塑积;配分过程中,碳配分和均匀化在几十秒内可完成;残余奥氏体含量是决定淬火马氏体钢塑性的主要控制因素。证实了热冲压淬火和配分工艺是一种可获得超高强度兼具高塑性汽车钢板的新型热成形处理工艺。
The hot stamping process of 30CrMnSi2Nb ultra-high strength steel was studied by hot stamping die. The influence of two-step quenching and blending process on the microstructure evolution and the ductility of ultra-high strength steel was tested. Microstructure was observed by OM and SEM. The variation of residual austenite content was studied by X-ray diffraction (XRD). The results show that the hot forming process can significantly improve the ductility and plasticity of steel. During the process of partitioning, the distribution and homogenization of carbon can be completed in several tens of seconds. The residual austenite content is the main factor that determines the plasticity of quenched martensitic steel Controlling factor. Confirmed that the hot stamping quenching and distribution technology is a new high-strength plastic sheeting can achieve both the new hot forming process.