锻压技术

热作模具钢的表面渗铝工艺及性能研究

英文标题：Research on surface aluminizing process and properties of hot working die steel

作者：赵宏宇

单位：长春职业技术学院

关键词：模具钢渗铝工艺微观组织性能

分类号：TG146

出版年,卷(期):页码：2014,39(11):102-106

摘要：

研究了4Cr5MoSiV1热作模具钢的表面渗铝工艺，对不同NH4Cl含量、不同渗铝温度和渗铝时间的渗层微观组织进行了观察，并采用XRD和显微硬度对最优渗铝工艺的渗层物相和硬度进行了检测和分析。研究结果表明:随着渗铝温度的升高，渗层厚度逐渐加大，当渗铝温度从850 ℃上升至950 ℃时，渗层厚度增加较为明显；渗层厚度随着渗铝保温时间的延长而逐渐增加，其中渗铝保温时间在3~5 h间渗层厚度增加最为明显；热作模具钢的最佳渗铝工艺为：采用1%催渗剂NH4Cl，渗铝温度为950 ℃，保温时间为5 h；优化工艺下的渗铝层中的表层形成了Fe3Al和FeAl相，内层形成了FeAl相。

The surface aluminizing process of 4Cr5MoSiV1 hot working die steel was studied, and the microstructures of aluminizing layer with different NH4Cl content, aluminizing temperature and aluminizing time were observed. The phases and hardness of the aluminizing layer with optimized surface aluminizing process were analyzed by XRD and micro-hardness. The results show that the thickness of aluminizing layer increases gradually with the rising of aluminizing temperature, and the thickness increases obviously when the aluminizing temperature rises from 850 ℃ to 950 ℃. The thickness of aluminizing layer increases gradually with prolonging temperature holding time, during which the thickness increases most obviously when the aluminizing holding time is within 3-5 h. The optimal surface aluminizing process for hot working die steel is 1% NH4Cl catalyst, the aluminizing temperature of 950 ℃ with holding time of 5 h. For the aluminizing layer obtained with optimized aluminizing process, the Fe3Al and FeAl phases are formed in its surface layer and FeAl phase is formed in its inner layer.

基金项目：

长春市科技计划项目（KJJH20120064）

赵宏宇（1969-），女，学士，副教授

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