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用光学显微镜及一级碳复型研究了各种规程的预处理对加微量 V、Ti.Nb 等元素的42CrMo 钢中的碳氮化物颗粒的大小、分布及其对奥氏体本质晶粒度的影响。结果表明,采用1100℃以上的高温固溶处理及随后足够快的速度冷却到较低温度能充分发挥 Al、V、Ti、Nb 等元素细化奥氏体晶粒的作用。试验用钢的冲击韧性并未因脆性碳氮化物的存在而下降,反因其晶粒的细化而略有改善。
The size and distribution of carbonitride particles in 42CrMo steel with addition of micro-V, Ti.Nb and other elements were studied by optical microscopy and first-order carbon compounding. Impact. The results show that austenite grains such as Al, V, Ti and Nb can be fully utilized by high temperature solution treatment at 1100 ℃ and subsequent rapid cooling to lower temperature. The impact toughness of the test steel did not decrease due to the presence of the brittle carbonitrides, but slightly improved due to the refinement of the grains.