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采用盐浴法对Al含量较高的TRIP800钢进行了Q&P(quenching and partitioning)工艺处理,研究淬火终点温度和分配时间对试验钢的显微组织、力学性能和残留奥氏体含量的影响。结果表明:试验钢的显微组织为铁素体基体上分布着块状马氏体或马氏体-奥氏体的混合组织,随着淬火终点温度的降低或分配时间的延长,马氏体或马-奥组织的微观形貌会发生变化;分配时间较短的试样综合力学性能更好,在淬火终点温度为250℃,分配时间为60 s时得到的试样强塑积最高,可达22238 MPa·%;试样的拉伸断口显示出良好的韧性断裂特征;在Q&P处理后试验钢的残留奥氏体含量大幅提高。
The quenching and partitioning process of TRIP800 steel with high Al content was carried out by salt bath method. The effects of quenching end temperature and distribution time on the microstructure, mechanical properties and retained austenite content were investigated. The results show that the microstructure of the test steel is a mixed structure of massive martensite or martensite-austenite distributed on the ferrite matrix. With the decrease of the quenching end temperature or the distribution time, the martensite Or MAO, the microstructure of the specimen will be changed. The samples with shorter distribution time have better mechanical properties, the highest plasticity of the specimens obtained when the quenching temperature is 250 ℃ and the distribution time is 60 s, Up to 22238 MPa ·%. Tensile fracture of the specimen showed good ductile fracture characteristics. The retained austenite content of the test steel increased significantly after Q & P treatment.