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采用光学显微镜及透射电镜观察,并进行力学性能试验,研究了固体介质持压淬火和热冲压两种条件下B1500HS钢板的微观组织形貌和力学性能,分析了形变对热冲压钢板强化的作用机理。结果表明:加热温度950℃,保温5min的条件下,固体介质持压淬火与热冲压后钢板金相组织均为板条状马氏体和少量残余奥氏体,材料强度大幅提升,抗拉强度分别达到1265、1448 MPa;相比固体介质持压淬火,热冲压成形试样中马氏体含量提高10.06%;热冲压形变强化相变,细化马氏体,位错密度增加并促进碳化物析出;高密度位错、细晶强化和析出强化的共同作用,提高了材料力学性能。
The microstructures and mechanical properties of B1500HS steel were studied under light and hot stamping conditions by using optical microscope and transmission electron microscope. Mechanical properties of B1500HS steel were also studied. The mechanism of deformation on hot stamped steel sheet . The results show that under the condition of heating temperature of 950 ℃ and holding time of 5min, the microstructure of the steel plate after hot pressing and hot pressing are both lath martensite and a small amount of retained austenite. The tensile strength Respectively, reaching 1265,1448 MPa. Compared with solid-state press hardening, the content of martensite in hot stamping increased by 10.06%. Hot stamping deformation enhanced phase transformation and martensite refinement, and the dislocation density increased and carbides promoted Precipitation; high-density dislocations, fine grain strengthening and precipitation strengthening together to improve the mechanical properties of materials.