锻压技术

热处理工艺对含镁新型热挤压模具性能的影响

英文标题：Influence of heat treatment process on the properties of new-typed hot-extruded die containing magnesium

作者：赵平关云卿赵国际

关键词：热挤压模具等温退火淬火磨损热疲劳

分类号：TG249.2

出版年,卷(期):页码：2016,41(10):138-141

摘要：

为了研究热处理工艺对4Cr5MoSiV1Mg1含镁新型热挤压模具的耐磨损性能和抗热疲劳性能的影响，选用6种不同的工艺对含镁新型热挤压模具进行热处理，并对热处理后的模具分别进行表面硬度测试、500 ℃高温摩擦磨损试验及热疲劳试验。结果发现：当退火温度从820 ℃提高到920 ℃或淬火温度从1000 ℃提高到1080 ℃时，模具的表面硬度、耐磨损性能和抗热疲劳性能均先升高后下降；与870 ℃×8 h常规退火相比，采用870 ℃×2 h+700 ℃×6 h等温退火可以使模具的表面硬度增加14%、500 ℃ 磨损体积减小45%、网状裂纹级别从2级减小至1级、主裂纹级别从2级减小至1级、热疲劳裂纹级别从4级减小至2级。因此，含镁新型热挤压模具的退火工艺优选为870 ℃×2 h+700 ℃×6 h等温退火，淬火温度优选为1040 ℃。

In order to study the influences of heat treatment process on the wear resistance and thermal fatigue resistance of the new-typed hot-extruded die containing magnesium 4Cr5MoSiV1Mg1, the new-typed hot-extruded dies were heated under six different processes, and the surface hardness test, high temperature wear test at the temperature of 500 ℃ and thermal fatigue test of the dies after heat treatment were conducted and analyzed. The results show that they first increase and then decrease with increase of annealing temperature from 820 ℃ to 920 ℃ or quenching temperature from 1000 ℃ to 1080 ℃. Comparing with normal annealing 870 ℃×8 h, the isothermal annealing 870 ℃×2 h+700 ℃×6 h increases the surface hardness by 14%, decreases wear volume by 45% at 500 ℃, reduces the mesh crackle and main crackle grade from grade 2 to grade 1 respectively, and reduces the grade of thermal fatigue crackle from grade 4 to grade 2. Thus, the optimized annealing process is the isothermal annealing process at 870 ℃×2 h+700 ℃×6 h, and the optimized quenching temperature is 1040 ℃.

基金项目：

重庆市教委科研项目（KJ132105）；2010年重庆市高等教育教学改革重大项目（101403）

作者简介：赵平（1962-），男，学士，副教授,高级工程师 E-mail：zhp827@qq.com

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