| 磨煤机电机轴断裂原因分析 |
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| 引用本文： | 张亚明,刘五铸,张雷.磨煤机电机轴断裂原因分析[J].中国材料科技与设备,2013(3):60-62. |
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| 作者姓名： | 张亚明 刘五铸 张雷 |
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| 作者单位： | [1]中国科学院金属研究所,辽宁沈阳110016 [2]中国石油天然气股份有限公司辽阳石化分公司,辽宁辽阳111003 |
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| 摘 要： | 利用光学金相显微镜、化学分析、硬度测试等实验手段，对35号钢电机轴在使用过程中发生的断裂原因进行分析。结果表明，电机轴表面的焊接热加工使得电机轴变径台肩处的次表面部位产生高硬度马氏体组织，造成该处的严重应力集中。在长期交变载荷的作用下，电机轴的变径台肩处产生微裂纹，构成多处裂纹源。随着这些裂纹长大并不断扩展，最终造成电机轴的疲劳断裂。
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| 关 键 词： | 磨煤机 电机轴 疲劳断裂 35钢 马氏体 |
Fracture Analysis of the Motor Shaft in a Coal Mill |
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| ZHANG Ya--ming,LIUWu--zhu,ZHANG Lei.Fracture Analysis of the Motor Shaft in a Coal Mill[J].Chinese Materials Science Technology & Equipment,2013(3):60-62. |
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| Authors: | ZHANG Ya--ming LIUWu--zhu ZHANG Lei |
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| Affiliation: | 2 (1. Institute of Metal Research, Chinese Academy of Sciences, Liaoning, Shenyang, 110016, China 2. Liaoyang Petrochemical Company, Petro China Company Limited, Liaoning, Liaoyang, 111003, China) |
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| Abstract: | Fracture analysis of the 35 # steel motor shaft in a coal mill was carried out by using optical metallographic microscope, chemical analysis and hardness testing. The results show that martensite structure with high hardness fromed on the subsurface of the motor shaft taper shoulder area due to the welding process, resulting in serious stress concentration there. Subjected to the alternating load for a long time, micro cracks formed on the shoulder, which acted as the crack originals. With the continuous propagation of the cracks, fatigue fracture occurred in the motor shaft. |
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| Keywords: | Coal mill Motor shaft Fatigue fracture 35 steel Martensite |
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