Grain Size Control by Niobium Microalloying in Gear Steel during High Temperature Carburizing

摘要：

Increased efficiency of the process of gear steel carburizing by increasing the carburizing temperature in order to reduce the treatment time is a well-known effect. However,grain coarsening and formation of mixed grain sizes during the high temperature carburizing process deteriorate the final mechanical properties such as fatigue strength and also lead to excessive distortion of the part. Niobium microalloying in combination with other alloying elements helps to prevent grain coarsening during high temperature carburizing and optimizes the mechanical properties. The fundamentals of the Nb effect in medium carbon steels are being explained. Several alloying concepts for application in passenger cars and also in heavier vehicles are demonstrated. Also indicated is the potential of economic achievements by the high temperature carburizing process.

关键词： gear steel high temperature carburizing niobium microalloying forging grain size control

作者: Hardy Mohrbacher

作者单位: NiobelCon bvba,2970 Schilde,Belgium,[phone]

会议类型: 国际会议

会议名称: 2009 International Symposium on Automobile Steel(2009年汽车用钢生产及应用技术国际研讨会)

会议地点: 大连

会议语种:英文

页码: 411-415

在线出版日期: 2009-09-06（万方平台首次上网日期，不代表论文的发表时间）