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据文献报道,快速水冷淬火可在试样表面形成残余压应力(RSs)从而显著提高其疲劳极限,这种技术被称为“强烈淬火”。德国热处理协会“淬火”技术委员会发起了一个旨在精确研究上述问题的研究项目。本文重点介绍马氏体相变对残余应力形成的影响。为了在圆柱试样表面得到残余压应力,需要确定合适的工艺窗口。在此窗口中,淬火冷却速度要求足够快,以致于在圆柱体内达到最大温度梯度之前,表面温度已经低于Ms。
According to the literature, rapid cooling by water quenching can form residual compressive stress (RSs) on the specimen surface to significantly increase the fatigue limit. This technique is called “intense quenching”. German Heat Treatment Association “Quenching ” Technical Committee launched a research project aimed at accurate study of the above problems. This article focuses on the effect of martensitic transformation on the formation of residual stress. In order to get the residual compressive stress on the cylindrical specimen surface, we need to determine the appropriate process window. In this window, the quench cooling rate needs to be fast enough that the surface temperature has dropped below Ms. before the maximum temperature gradient is reached in the cylinder.