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渗碳钢与氮化钢的重要区别之一就是前者可以根据各种不同的要求在退火后容易再度硬化,但氮化钢则不能作这样处理。工件一经硬化即不能变更,所以在某种场合下可以认为这是氮化钢的缺点,如机械加工错误无法更正,模子尺寸不能改变等。氮化钢使之软化或退火并不怎样困难,但过去常常认为这样的钢无法使其再度氮化或恢复最高硬度。经本文作者研究试验后,认为这种情况仅局限于铝铬钼钢(En41型)而不限于铬钼钢(En40A型)或铬钼钒钢En40C型)。
One of the important differences between carburizing and nitrided steels is that the former can be easily re-hardened after annealing according to various requirements, but nitrided steels can not be treated as such. Once hardened workpiece that can not be changed, so in some cases can think this is the shortcomings of nitrided steel, such as machining errors can not be corrected, the mold can not change the size and so on. Nitrided steel makes it less difficult to soften or anneal, but in the past it was not always possible to re-nitriding or recovering the highest hardness of such steels. After the study by the author of this article, it is considered that the situation is limited to the aluminum-chromium-molybdenum steel (En41 type) and not limited to the chromium-molybdenum steel (En40A type) or chromium molybdenum vanadium steel (En40C type).