25Cr2MoVA钢气体渗氮的脆性及耐磨性

Brittleness and wear resistance research of gas nitrided 25Cr2MoVA steel

渗氮层的脆性和耐磨性是评价其质量的重要指标。本文对25Cr2MoVA钢进行气体渗氮试验,利用X射线衍射仪、光学显微镜、显微硬度计以及磨损试验机对渗氮层进行分析,重点研究了不同工艺下渗氮层的脆性及耐磨性。结果表明,脆性级别均为1级,渗氮后的试样的耐磨性有显著提高。

The brittleness and wear resistance are important indicators of nitriding layer quality. 25Cr2MoVA steel was treated by gas nitriding. The nitrided layer was characterized by Xray diffraction,metallography,microhardness test,and wear test. The research focused on the wear resistance and brittleness of nitriding layer treated by different nitriding parameters. The results show that the wear resistance is enhanced. It is suggested that the optimum wear resistance can be obtained when the nitriding condition being T = 520 ℃,K N = 0. 2,t = 5 h by the evaluation of wear volume and wear scar width.