【摘要】 通过对含Ｍｏ的２０ＣｒＭｎＴｉ钢制齿轮坯料正火组织、性能的研究分析，证明此钢正火后形成粒状贝氏体导致其硬度较高（一般为２６０～２８０ＨＢ），从而给坯料加工带来困难。为此，本文提出了等温正火处理新工艺，其硬度与２０ＣｒＭｎＴｉ钢正火后的硬度相同，以适应机械加工需要更多还原

【Abstract】 Through study and analysis of normalized structure and property of 20CrMnTi steel with a trace content of Mo for semifinished gears,it indicated that the cutting difficulty is due to the emerge of granular Bainite which raise the hardness up to 260280HB.A new isothermal normalizing process has been given in this paper.And the same degree of hardness as normalized 20CrMnTi steel can be obtained,the machining process requirements are met.更多还原