【摘要】 测定了Ｔ１０、ＧＣｒ１５、６ＣｒＷ２Ｓｉ、ＹＫ 等钢种在不同奥氏体化条件下的不均匀因子及其对奥氏体晶粒长大的影响规律。试验结果表明，不均匀因子与材料成分、原始组织及加热工艺密切相关。在临界点以上选取合适温度进行分级加热可有效地降低奥氏体不均匀因子，限制平均晶粒直径，最终晶粒度可比相同温度直接加热提高２ ～３ 级，从而既可遏制奥氏体晶粒的异常长大，又有利于调整奥氏体成分，为解决中碳高合金ＹＫ 钢的强韧化热处理提供了工艺途径。更多还原

【Abstract】 The pattern of uneven factor upon different austenitizing and its effect on austenite grain growth have been measured on steels T10,GCr15,6CrW2Si and YK.Experiment results showed that the uneven factor was closely relevant to composition,original microstructure and austenitizing processes of the steels.The uneven factor could be effectively decreased and average grain size of austenitebe controlled by means of soaking at proper temperature above critical points of the steels.Consequently,the grain size upon finally austenitizing could be finer by 2～3 grades than direct austentizing,and plenty of room for adjusting austenite composition offered,which provides a processing method for strengthening & toughening treatment of middle carbon high alloy tool steel YK.更多还原