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钢的实际晶粒度的评定,对判断材料的质量,检验热加工工艺的正确性、研究晶粒度对有关性能的影响等具有十分重要的意义。在工厂机械零件热处理工艺中,常规定有晶粒度的要求范围,并且把它列为工件质量评定的一项重要指标。多年来,实际晶粒度的显示和评定一直受到金相热处理工作者的广泛重视。一、实际晶粒度的各种解释目前对钢的实际晶粒度的认识尚未统一,给工件质量的评定带来不少困难。例如,我厂20Cr钢制蜗杆渗碳后变形超差,在远
The evaluation of the actual grain size of steel is of great significance for judging the quality of the material, checking the correctness of the thermal processing technology and studying the influence of the grain size on the relevant properties. In the factory machinery parts heat treatment process, the conventional set the grain size of the required range, and put it as a quality assessment of the workpiece an important indicator. Over the years, the actual grain size of the display and assessment has been metallurgical heat treatment workers widespread attention. First, the actual grain size of the various explanations At present, the actual understanding of the grain size of steel has not yet unified, to the workpiece quality assessment brings many difficulties. For example, my factory 20Cr steel worm after deformation of ultra-poor carburizing, in the far