渗氮工作气压对H13钢离子渗氮层组织及性能的影响

Effect of Working Pressure on Microstructure and Properties of Plasma Nitrided Layer of H13 Steel

采用自制的LD-650型直流等离子体增强化学气相沉积炉在不同渗氮工作气压下对H13钢进行了离子渗氮处理,研究了工作气压对该钢渗氮层组织及性能的影响。结果表明:渗氮工作气压显著影响渗氮层的厚度,随着工作气压的升高,渗氮层中化合物层厚度呈现先增加后减小的趋势,在1066Pa下达到极大值9μm;工作气压对渗氮层表面硬度影响较小;随着工作气压的升高,化合物层的ε相和γ′相均增加,在1 066 Pa时其体积分数达到最大,分别为37.1%和35.7%;在试验条件下,工作气压为1 066 Pa下得到的渗氮层性能良好。

H13 mould steel was plasma nitriding treated at different working pressures in a self-made LD-650 type DC plasma chemical vapor deposition furnace.The effect of the working pressure on microstructure and properties of the nitrided layers was studied.The results show that the working pressure significantly influenced the thickness of the nitrided layer.As the increase of working pressure,the thickness of the nitrided compound layer increased firstly and then decreased.A nitrided layer with maximum thickness of 9μm was obtained at the working pressure of 1 066 Pa.The influence of the working pressure on the surface hardness of H13 steel was slight.The volume fraction ofεandγ′phases in the layer increased with the working pressure increase,and reached to the maximum values at the working pressure of 1 066 Pa,which were 37.1%and 35.7%respectively.The nitrided layer had a good performance at the pressure under the test condition.