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我同意上海第四纺织机械厂吴攸平、严凤娟二同志的“用有效硬化层深度代替金相法测渗碳层深度”的建议。众所周知,通过渗碳使零件表层成为高碳层,目的在于在随后淬火后高碳表层能够得到高强度、高硬度、高耐磨性和高的接触疲劳强度,并与低碳心部的塑性、韧性良好配合。不仅如此,高碳表层淬火后还残留相当高的压应力,以抵消部分交变的张应力,从而提高了零件的疲劳强度。所以渗碳淬火能够满足那些在高速高负荷等受力复杂而繁重条件下工作零件的要求,这是一般淬火工艺所力所不及的。由此可见。渗碳只是一种手段,获得硬化的表层则是我们的目的,所以测定硬化层更有实际意义。
I agree with the recommendations of Comrade Wu Youping and Yan Fengjuan of Shanghai No.4 Textile Machinery Factory that “the depth of effective hardened layer should be used instead of the depth of carburized layer by metallographic method”. As we all know, through carburizing parts of the surface to become high-carbon layer, the purpose is to be high-carbon surface layer after quenching can be high strength, high hardness, high wear resistance and high contact fatigue strength, and the low-carbon heart plasticity, Toughness with good. Not only that, after high-carbon surface quenching residual high compressive stress to offset part of the alternating tensile stress, thereby enhancing the fatigue strength of the parts. Therefore, carburizing and quenching to meet those in the high-speed high-load and other parts under the conditions of complex and demanding work requirements, which is beyond the normal quenching process. This shows. Carburizing is only a means of achieving a hardened surface is our goal, so the determination of hardened layer more practical significance.