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本文通过随生产进行的试验,得出了20CrMnMo和20CrMnTi钢的渗层最大淬透性和最高硬度分别相对应的碳与氮的含量。随着直接淬火温度升高,20CrMnMo渗层呈反“C”形的等硬度线峰值向左移动;对20CrMnTi渗层的,则几死影响。适当降低直接淬火温度可减轻20CrMnMo渗层的硬度随层深变化曲线在表面处的“低头”现象。较低的直接淬火温度和较强的冷却速度,可消除20CrMnTi渗层的“低头”现象,碳氮共渗的渗层淬透性和淬硬性皆比渗碳层的低。
In this paper, the carbon and nitrogen contents of the maximum hardenability and the highest hardness of 20CrMnMo and 20CrMnTi steels, respectively, were obtained through tests carried out with the production. With the direct quenching temperature increases, 20CrMnMo seepage layer presents anti-“C” shape such as the hardness line moves to the left; the 20CrMnTi layer, then the death effect. Appropriately reducing the direct quenching temperature can reduce the “bow” phenomenon at the surface of the hardness of 20CrMnMo layer with the layer depth curve. The lower direct quenching temperature and stronger cooling rate can eliminate the “bow” phenomenon of 20CrMnTi seepage layer, which is lower than the carburized layer in hardenability and hardenability.