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用一级碳膜复型及光学显微镜研究了各种规程的予处理对加有微量V、Ti、Nb等元素的42CrMo钢中的碳氮化物颗粒的数量、大小、分布及其对奥氏体本质晶粒度的影响规律。得出,必须探用1100℃以上的高温固溶处理,才能保证Al、V、Ti、Nb等元素所形成的碳氮化物充分溶入奥氏体中。同溶处理后则必须以足够快的速度冷却,使碳氮化物颗粒在较低的温度自奥氏体或在回火时自马氏体中以弥散状态析出,方能使微量的Al、V、Ti、Nb、等元素充分地发挥其细化作用。此外,试验所用钢料的冲击韧性并未因脆性碳氮化物的存在而有所下降。反而因其显著的细化晶粒的作用而略有改善。
The carbonitride particles in 42CrMo steel with a trace amount of V, Ti, Nb and other elements were pretreated by first-order carbon film compounding and optical microscopy to deal with the number, size and distribution of carbonitride particles in austenite The influence of the grain size. It is concluded that the high-temperature solution treatment above 1,100 ° C must be explored to ensure that the carbonitride formed by Al, V, Ti, Nb and other elements fully dissolves into the austenite. Co-solution treatment must then be fast enough to cool the carbonitride particles from the austenite at a lower temperature or from the martensite in the state of precipitation was dispersed, only a trace amount of Al, V , Ti, Nb, and other elements to fully play its refining role. In addition, the impact toughness of the steel used in the test was not reduced by the presence of the brittle carbonitrides. But slightly improved because of its significant grain refinement.