论文部分内容阅读
本文研究了GCr15钢冷模具经高温固溶碳化物细化和四次循环快速加热淬火使奥氏体超细化的显微组织和机械性能的变化。试验结果表明,高温固溶预处理可使碳化物显著细化并均匀分布,碳化物尺寸由0.9～1.2μm减少为0.3～0.4μm。经四次循环快速加热淬火,晶粒由8级细化为14级。双细化处理后,消除了常规淬火组织的“黑白区”,并提高了位错马氏体相对数量,使材料在保持高强度、高硬度情况下,显著改善了塑性和韧性,特别是断裂韧性提高和多次冲击寿命大幅度增加,获得了最佳的强韧性配合。用以处理冷模具可防止早期脆断,提高使用寿命。
In this paper, the microstructure and mechanical properties of the GCr15 steel cold mold after the high-temperature solid solution carbides refinement and four-cycle rapid heating quenching to make austenite superfine were studied. The results show that the carbides can be significantly refined and uniformly distributed by high temperature solid solution pretreatment, and the size of carbide decreases from 0.9 ~ 1.2μm to 0.3 ~ 0.4μm. After four cycles of rapid heating quenching, grain refinement from 8 to 14. Double refinement eliminates the “black and white zone” of conventional quenched microstructures and increases the relative amount of dislocation martensite, allowing the material to significantly improve ductility and toughness, particularly fracture, while maintaining high strength and hardness Increased toughness and repeated shock life increased significantly, with the best strength and toughness. Used to deal with cold mold to prevent early brittle fracture, improve service life.