高温形变热处理高温回火强韧化机理探讨

Study on the Strengthening and Toughening Mechanism in Thermomechanical Treatment and High Temperature Tempering

本文研究了变形量对GX-8钢经高温形变热处理后组织和机械性能的影响。研究结果表明,GX-8钢高温形变淬火前的奥氏体组织状态和高温持久性能之间存在着明显的对应关系。高温形变热处理提高GX-8钢高温回火态高温持久性能的主要原因是,可增加高温回火态的位错密度,细化亚晶粒,同时改善了高温回火状态碳化物的分布。

This paper deals with the effect of degree of deformation on the microstructures and mechanical properties of steel GX-8 after high temperature thermomechanical treament. Results obtained are as follows: obvious relationship can be found between austenite structure before high temperature ausform-hardening and high temperature endurance property, the dominant reason that high tmperature thermomechanical treatment raises the high temperature endurance property of steel GX-8 is that it increases dislocation density and refines subgrain after high temperature tempering and refines the austenite grain and reformes of carbide distribution.