叶轮转轴断裂分析
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摘要
叶轮转轴在工作中断裂,通过对故障转轴及其断口进行宏微观检查、砂轮越程槽圆角半径测量、金相组织观察、化学成分分析、力学性能测试等,对断裂原因进行分析,并对转轴相关零组件进行完整性分析。结果表明:转轴断口性质为疲劳断裂,裂纹源在砂轮越程槽底部;叶轮偏载是导致转轴发生疲劳断裂的主要原因;转轴的强度和硬度偏高,对裂纹萌生和扩展有较大的促进作用;建议转轴调质前粗车台阶或调整热处理制度,改善裂纹源处组织,提高转轴疲劳寿命。
The rotating shaft of an impeller fractured during working. Macro and micro observation,size measurement,macro and microstructure examination,chemical composition analysis,hardness and mechanical properties testing were carried out to find out the cause for the fracture. In addition,integrity analysis was conducted for the related components. The results show that the failure mode of the rotating shaft is fatigue fracture. Cracks initiated at the bottom of the grinding wheel groove. The main cause for the cracking is the unbalanced load on the impeller. The hardness and strength of the shaft is higher,promoting the initiation and propagation of the cracks. It is suggested that rough turning should be performed on the steps of the shaft before quenching or the heat treatment process should be adjusted so that the microstructure of the cracking source zone can be improved and the fatigue life can be increased.
The rotating shaft of an impeller fractured during working. Macro and micro observation,size measurement,macro and microstructure examination,chemical composition analysis,hardness and mechanical properties testing were carried out to find out the cause for the fracture. In addition,integrity analysis was conducted for the related components. The results show that the failure mode of the rotating shaft is fatigue fracture. Cracks initiated at the bottom of the grinding wheel groove. The main cause for the cracking is the unbalanced load on the impeller. The hardness and strength of the shaft is higher,promoting the initiation and propagation of the cracks. It is suggested that rough turning should be performed on the steps of the shaft before quenching or the heat treatment process should be adjusted so that the microstructure of the cracking source zone can be improved and the fatigue life can be increased.
引文
[1]缪宏博,刘高扬,石国全,等.发动机关键结构材料温色图谱[M].北京:国防工业出版社,2010:82-83.
[2]张栋,钟培道,陶春虎,等.失效分析[M].北京:国防工业出版社,2004:138-141.
[3]顾宝兰,张雪涛,徐彤.45钢电机轴断裂分析[J].理化检验:物理分册,2013,49(5):327-329.
[4]陈俊健.45钢驱动轴断裂原因分析[J].机械工程师,2013(5):5-7.
[5]杨勇,施钢,冯文莱,等.轻型客车发动机曲轴断裂原因分析[J].失效分析与预防,2016,11(1):17-20.
[6]唐家耘,陈耘,赵洁,等.汽车前驱动轴断裂失效原因分析[J].失效分析与预防,2015,10(4):243-247.
[7]初泰安.离心泵主轴断裂失效分析[J].热加工工艺,2015,44(20):241-242.
[8]郑真,张兵,赵剑.汽车发动机曲轴断裂分析[J].失效分析与预防,2016,11(4):261-264.
[9]张涛,高云鹏,田峰,等.电站汽动给水泵OCr13Ni4Mo不锈钢主轴断裂失效分析[J].理化检验:物理分册,2015,51(10):725-729.
[10]焦丽,王国亮,徐向阳,等.柴油机曲轴断裂原因分析[J].金属热处理,2015,40(8):195-198.
[2]张栋,钟培道,陶春虎,等.失效分析[M].北京:国防工业出版社,2004:138-141.
[3]顾宝兰,张雪涛,徐彤.45钢电机轴断裂分析[J].理化检验:物理分册,2013,49(5):327-329.
[4]陈俊健.45钢驱动轴断裂原因分析[J].机械工程师,2013(5):5-7.
[5]杨勇,施钢,冯文莱,等.轻型客车发动机曲轴断裂原因分析[J].失效分析与预防,2016,11(1):17-20.
[6]唐家耘,陈耘,赵洁,等.汽车前驱动轴断裂失效原因分析[J].失效分析与预防,2015,10(4):243-247.
[7]初泰安.离心泵主轴断裂失效分析[J].热加工工艺,2015,44(20):241-242.
[8]郑真,张兵,赵剑.汽车发动机曲轴断裂分析[J].失效分析与预防,2016,11(4):261-264.
[9]张涛,高云鹏,田峰,等.电站汽动给水泵OCr13Ni4Mo不锈钢主轴断裂失效分析[J].理化检验:物理分册,2015,51(10):725-729.
[10]焦丽,王国亮,徐向阳,等.柴油机曲轴断裂原因分析[J].金属热处理,2015,40(8):195-198.