自转式空气锤活塞用20CrMnTi钢热处理工艺优选及力学性能测试

Optimization of Heat Treatment Process and Mechanical Properties Test of 20CrMnTi Alloy for Self-rotation Air Hammer Piston

利用HB-62.5型布氏硬度计测试了20CrMnTi低碳合金在不同热处理工艺下的布氏硬度值,并与自转式空气锤活塞需用工况下的硬度值进行比较,优选了满足硬度设计要求的热处理工艺;在满足上述硬度要求的热处理工艺基础上,利用HY-930TS万能试验机和HY-608冲击试验机分别对试样进行了拉伸性能和冲击性能试验;在满足新型自转式空气锤活塞需用工况下所需性能参数的前提下,确定了20CrMnTi最佳热处理工艺:880℃×80min油冷+550℃×100min后水冷。

Compared with the hardness of self-rotation air hammer piston at the required conditions, the heat treatment process with meeting hardness requirements for 20CrMnTi alloy after different heat treatments was established by testing their Brinell hardness with using HB-62.5 Brinell hardness tester. Based on which, the tensile and impact properties of self-rotation air hammer piston were tested by HY-930TS universal testing machine and HY-608 impact testing machine, and compared with the required performance parameters, the optimal heat treatment process was established at the end. The results show that quenching at 880℃ for 80 min and oil cooling, then tempering at 550℃ for 100 min and water cooling is the optimal heat treatment process for 20CrMnTi in the aspects of self-rotation air hammer piston.