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通过金相检测和显微硬度测试等手段,对17Cr2Ni2MoVNb钢齿轮和20Cr2Ni4A钢齿轮的渗层、心部组织、晶粒度及渗层深度等渗碳处理质量进行分析,并采用PLG-300C拉压疲劳试验机对上述两种材料齿轮进行弯曲疲劳寿命测试。结果表明,齿轮加载齿根处有效渗层深度和显微硬度是齿轮弯曲疲劳寿命的主要影响因素,相同载荷条件下加载齿根处有效渗层深度减小,轮齿弯曲疲劳寿命明显缩短;加载齿根显微硬度增大,轮齿弯曲疲劳寿命提高。渗层表面出现浅层脱碳层时(齿根脱碳层≤0.2 mm),虽然会降低轮齿的弯曲疲劳寿命,但相比加载齿根处的渗层深度和表面硬度,脱碳层的影响并不明显。
By means of metallographic examination and microhardness test, the quality of infiltrating layer, heart tissue, grain size and depth of infiltration layer of 17Cr2Ni2MoVNb steel gear and 20Cr2Ni4A steel gear were analyzed and PLG-300C tension and compression Fatigue testing machine on the two materials gear bending fatigue life test. The results show that the effective depth of penetration and microhardness at gear tooth root are the main factors affecting the bending fatigue life of gears. The depth of effective permeable layer at the tooth root under loading is reduced and the bending fatigue life of gear tooth is obviously shortened under the same load. Dental root microhardness increases, tooth bending fatigue life increase. In the case of a shallow decarburized layer (decarburized dedeposition layer ≤0.2 mm) on the surface of the infiltrated layer, although the bending fatigue life of the tooth is reduced, compared with the depth of the infiltrated layer and the surface hardness at the loaded tooth root, The impact is not obvious.