高温渗碳齿轮钢的研究进展

Research Progress in Gear Steels for High Temperature Carburization

常用齿轮钢渗碳温度为930℃,提高渗碳温度至1000～1050℃能显著缩短渗碳时间,但易引起晶粒长人,因此发展了通过Nb、Ti、B微合金化,细化钢原奥氏体晶粒的高温渗碳齿轮钢。文中介绍了国内外高温渗碳齿轮钢的钢种成分、工艺特点、高温渗碳层组织控制和钢的疲劳性能的研究进展。

The carburizing temperature of common gear steels is 930 ℃, as the carburizing temperature of steel in- creases to 1 000 - 1 050 ℃ the time of carburization process can be remarkably reduced but it easily leads to grain coarse- ning. Therefore the high temperature carburization gear steels are developed by Nb, Ti, B microalloying to fine original austenite grain size in steel. The research progress in gear steels for high temperature earburization at home and abroad in- cluding grade and chemical composition, process characteristics, control of structure in high temperature carburized layer and fatigue properties of steel is presented in this article.