小载荷强化对汽车零件表面硬度的影响  

Change of Surface Hardness for Vehicle Component after Strengthening under Low-amplitude Loads

作　　者：卢曦[1] 郑松林[1] 

机构地区：[1]上海理工大学机械工程学院

出　　处：《农业机械学报》2008年第5期182-185,共4页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(项目编号:50375101);上海市自然科学基金资助项目(项目编号:07ZR14081);上海市教委创新项目(项目编号:08YZ102)

摘　　要：以未经过表面工艺强化的低强度汽车前桥和经过表面工艺强化的高强度汽车变速箱齿轮为对象,对汽车零件经过疲劳极限以下小载荷强化前后,表面硬度的变化规律及其微观原因进行了试验研究和分析。结果表明,小载荷强化后,低强度前桥的表面硬度随着其强度的提高而提高;高强度变速箱齿轮的表面硬度随着其强度的提高而降低;小载荷强化所引起的结构微观组织变化是其表面硬度变化的主要原因;对于汽车零件表面硬度的变化而言,强化和损伤的作用效果相同。The change and reason of surface hardness were investigated for vehicle components, which include the front axle without surface strengthened process and the transmission gear with surface strengthened process, after strengthening under low amplitude load. The experimental results show that the variation is almost direct ratio to strength and hardness of the front axle after strengthening under low-amplitude loads, but it is inverse ratio for the transmission gear. The main reason of surface hardness variation of vehicle components is that the micro-structure is strengthened and improved. For the surface hardness variation of vehicle components, the strengthening and fatigue damage exhibit the same effect.

关 键 词：汽车 零件 疲劳 小载荷强化 表面硬度 

分 类 号：U463.03[机械工程—车辆工程] U467.497[交通运输工程—载运工具运用工程]