| 42CrMo钢阀杆断裂失效分析 |
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| 引用本文： | 魏仕勇,付青峰,曹美蓉,万珍珍.42CrMo钢阀杆断裂失效分析[J].热处理技术与装备,2013(5):65-67. |
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| 作者姓名： | 魏仕勇 付青峰 曹美蓉 万珍珍 |
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| 作者单位： | 江西省科学院江西省铜钨新材料重点实验室,江西南昌330029 |
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| 基金项目： | 江西省科学院国家预研项目（2011-YGY-02）,江西省科学院惠普项目（2013-XTPH2-22） |
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| 摘 要： | 42CrMo钢阀杆在使用过程中倒角部因承受较大的力而发生断裂。采用金相显微镜和扫描电镜对液压件渗碳表层及过渡层的组织特征进行分析，用显微硬度计测定阀杆硬化层深度和硬度梯度分布，从组织结构和硬度分布分析失效原因。结果显示，阀杆的强度和硬度都低于技术条件要求，阀杆的结构设计以及硬度和强度降低是阀杆断裂的最主要原因。
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| 关 键 词： | 42CrMo钢阀杆 断裂 失效 |
Fracture Failure Analysis on 42CrMo Steel Stem |
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| WEI Shi-yong,FU Qing-feng,CAO Mei-rong,WAN Zhen-zhen.Fracture Failure Analysis on 42CrMo Steel Stem[J].Heat Treatment Technology and Equipment,2013(5):65-67. |
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| Authors: | WEI Shi-yong FU Qing-feng CAO Mei-rong WAN Zhen-zhen |
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| Affiliation: | (Jiangxi Key Laboratory of Advanced Copper and Tungsten Materials, Jiangxi Academy of Sciences, Nanchang Jiangxi 330029, China) |
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| Abstract: | Chamfer of 42CrMo steel stem breaked as bearing larger force during using process. The struc- ture characteristics of the carburizing surface layer and transition layer of hydraulic parts were analyzed by metallographic microscope and SEM. The hardened layer depth and hardness gradient distribution of stem were determinated by micro hardness tester, and failure causes were analyzed from the microstructure and hardness distribution. The result showed that the strength and hardness of stem were lower than the techni- cal requirement. The primary reason of stem fracture was the structure design and lower strength and hard- ness. |
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| Keywords: | 42CrMo steel stem fracture failure |
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