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一、综述在过共析钢的淬火组织中,有关残余碳化物的尺寸与分散度以及马氏体的固溶成份与均匀性对轴承、工具等使用性能的影响问题,已为人们所重视。由于上列因素均与淬火前预备组织中的碳化物形态及其分散度有关,故为了充分发挥过共析钢的性能潜力,近年来,以 GCr15钢为代表,开展碳化物细化工艺的试验研究,已成为轴承热处理一个新动向。综合有关文献,目前 GCrl5钢碳化物细化工艺具有以下主要特点:1.高温固溶化预处理为了消除未溶碳化物对细化的不良影响,根据正火或退火原始组织中碳化物的形态不同,欲使其全部固溶,分别采取 A_(cm)以上不同温度进行高温奥氏体化处理。随后冷却方式的选择则以防止先共析碳化物的析出
I. Summary In the hyperthermic organization of hypereutectoid steel, attention has been paid to the influence of the size and dispersion of residual carbides and the effect of the solid solution composition and uniformity of martensite on the serviceability of bearings and tools. As the above factors are related to the carbide morphology and the degree of dispersion in the pre-quenched microstructure, in order to give full play to the performance potential of the eutectoid steel, in recent years, with the GCr15 steel as the representative, tests on the carbide refining process Research, has become a new trend of bearing heat treatment. Based on the literature, the current GCrl5 steel carbide refinement process has the following main features: 1. High-temperature solutionizing pre-treatment In order to eliminate the undissolved carbide on the refinement of the adverse effects, according to normalizing or annealing the original carbide morphology different , To make it all solid solution, respectively, to take A_ (cm) above the different temperatures for high-temperature austenitic treatment. The choice of cooling mode then prevents the precipitation of pro-eutectoid carbides