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对17Cr2Ni2Mo钢制汽车齿轮试件进行热处理、磨削加工及喷丸强化,借助无损残余应力测量设备与显微硬度测试议测试了各处理工艺下试件表层残余应力与显微硬度。结果表明,常规的渗碳淬火+回火处理工艺可保证较高的表层残余压应力与力学性能,磨削加工会恶化残余应力分布,降低疲劳性能,而喷丸强化则可彻底改变表层原始应力分布状态,有利于提高抗疲劳性能。
The 17Cr2Ni2Mo steel automotive gears were heat-treated, ground and shot peening. The residual stress and microhardness of the specimens were tested under various treatment conditions by means of nondestructive residual stress measurement equipment and microhardness test. The results show that the conventional carburizing and tempering treatment can ensure high residual compressive stress and mechanical properties of the surface. The grinding process will worsen the residual stress distribution and reduce the fatigue performance. However, shot peening can completely change the surface initial stress Distribution, help to improve anti-fatigue performance.