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众所周知,氮碳共渗适用钢材广、渗速较快,操作简单,变形小,渗层脆性小但较薄,而气体渗氮表面硬度较高,渗层较厚,但操作周期长,渗层脆性较大。生产应用中,两者都不同程度地受到限制。为发挥两种工艺的优点,并克服其不足,我们试验一种“复合渗氮”工艺,即先用纯氨进行渗氮,形成化合物层和过渡层,然后再进行氮碳共渗,形成氮碳化合物层,使工件表层获得较深且塑性较好的渗氮层。实践证明,此工艺重现性好,操作简便,工件变形小,成本低,是一种有发展前途的工艺方法。
As we all know, nitrocarburizing for a wide range of steel, fast infiltration, simple operation, small deformation, brittle brittle small but thin, and gas nitriding surface hardness is higher, thicker layer, but the operating cycle is long, the layer More brittle. In production applications, both are limited to varying degrees. In order to exert the advantages of the two processes and to overcome their deficiencies, we experimented with a “composite nitriding” process, in which nitriding with pure ammonia was first conducted to form a compound layer and a transition layer, followed by nitrocarburizing, Nitrocarbon layer formed to make the workpiece surface deeper and better nitriding layer. Practice has proved that this process reproducibility, easy operation, small deformation of the workpiece, low cost, is a promising process.