Cr12Mo1V1模具钢基体强韧化热处理工艺

Matrix strengthening and toughening heat treatment process of Cr12Mo1V1 die steel

采用光学显微镜、Image-proplus 6.0软件图像分析、硬度测试、冲击试验和弯曲试验等研究了不同基体强韧化热处理工艺对Cr12Mo1V1冷作模具钢微观组织和力学性能的影响。结果表明:循环相变多次奥氏体化工艺通过细化晶粒尺寸和碳化物,能够有效提升Cr12Mo1V1钢的强韧性,循环次数和奥氏体化温度对其力学性能影响显著。奥氏体化循环2次比循环3次能够获得更大的性能提升。循环相变奥氏体化能够细化碳化物颗粒,改善碳化物形态,随着循环相变奥氏体化道次以及温度的增加,碳化物的细化效果更显著。循环相变奥氏体化能够细化奥氏体晶粒尺寸,但奥氏体化温度不宜过高,过高的奥氏体化温度导致晶粒长大,首道次奥氏体化温度为1050℃效果最佳。

Effect of different matrix strengthening and toughening heat treatment processes on microstructure and mechanical properties of Cr12 Mo1 V1 cold working die steel was investigated by means of optical microscope, Image-proplus 6.0 software analysis, hardness test, impact test and bending test. The results show that the strength and toughness of the Cr12 Mo1 V1 steel can be effectively improved by the cyclic transformation multiple austenitizing process by refining the grain size and carbides. The cyclic transformation times and austenitizing temperature have a significant effect on its mechanical properties. Austenitizing for 2 cycles can obtain greater performance improvement than that for 3 cycles. Cyclic transformation austenitizing can refine carbide particles and improve carbide morphology. With the increase of cyclic transformation austenitizing times and austenitizing temperature, the refinement effect of carbide is more significant. Cyclic transformation austenitizing can refine austenite grain size, but the austenitizing temperature should not be too high. Too high austenitizing temperature leads to grain growth. The first austenitizing temperature of 1050 ℃ is the best.