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一、前言 18CrNiWA钢是兵器工业中广泛使用的结构钢之一。在近年来对曲轴疲劳性能的研究中发现钢中有非马氏体组织存在。解剖曲轴进一步证实,截面尺寸小于30毫米处其金相组织为粒状贝氏体、马氏体、上贝氏体和下贝氏体的混合组织,且粒状贝氏体最多,约占50～70％。为研究粒状贝氏体对机械性能,尤其对疲劳性能的影响,用不同方法获得了这个钢的不同含量的粒状贝氏体组织,分别测定其机械性能,从而确定了粒状贝氏体含量对机械性的影响。
I. Introduction 18CrNiWA steel is one of the structural steel widely used in the weapon industry. In recent years, the study on the fatigue properties of crankshafts found non-martensite in steel. Anatomical crankshaft further confirmed that the cross-sectional size of less than 30 mm at the microstructure of granular bainite, martensite, bainite and lower bainite mixed organization, and granular bainite, accounting for about 50 to 70 %. In order to study the influence of granular bainite on the mechanical properties, especially on the fatigue properties, the granular bainite of different content of this steel was obtained by different methods and its mechanical properties were measured respectively. The effects of granular bainite content on mechanical Sexual effects.