【作者】 金学军； 龚煜； 李伟；

【Author】 Jin Xuejun;Gong Yu;Li Wei;School of Materials Science and Engineering, Shanghai Jiao Tong University;

【机构】 上海交通大学材料科学与工程学院；

【摘要】 采用超高强钢是实现汽车轻量化兼顾安全性的必由之路,热冲压成形是高强韧汽车零件成形的关键工艺。为获得超高强韧热成形钢与良好使用性能的热冲压零件,需配合使用多种强韧化机制,本项目提出以形变QPT(DQPT)工艺为主要研究思路,探索塑性成形与热处理一体化新工艺,以获得细晶多相(亚稳奥氏体相、高强马氏体相、纳米析出相)多层级非均质组织,达到超高强韧的目标。形变QPT(DQPT)具有增加位错密度、改变相变途径(如相变临界温度降低、形核密度增加等)、优化组织形貌、调控亚稳奥氏体、促进析出、缩短热处理时间等优点,是新一代超高强韧钢的组织设计与开发应用的新手段。更多还原

【Abstract】 High strength steels have seen increasing demands for the concerns of better safety and low energy consumption, especially in the automobile and clean energy industries. An innovative quenching-partitioning-tempering(QPT) heat treatment was developed in realization of complex microstructure by affordable elements and manufacturing costs. A significant increase in elongation of a boron steel by integrated process of deformation and QPT treatment were achieved, which can be attributed to the nanoscale duplex microstructure comprising ultrafine retained austenite and martensite. The principles of QPT treatment integrated with deformation may extend its application in tailoring the multiscale microstructures of various advanced high strength steels.更多还原