Fracture Cause of Marine Diesel Engine Crankshaft

HOU Shuaishuai; ZENG Xianchen; SHI Chao; CHI Yuandi; HU Jiakun; FU Chunxia

doi:10.11973/jxgccl201908014

Materials and Mechanical Engineering > 2019 > 43(8): 69-74. > DOI: 10.11973/jxgccl201908014

HOU Shuaishuai, ZENG Xianchen, SHI Chao, CHI Yuandi, HU Jiakun, FU Chunxia. Fracture Cause of Marine Diesel Engine Crankshaft[J]. Materials and Mechanical Engineering, 2019, 43(8): 69-74. DOI: 10.11973/jxgccl201908014

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Fracture Cause of Marine Diesel Engine Crankshaft

1. Qingdao Product Quality Supervision and Testing Research Center, Qingdao 266101, China;
2. Qingdao Product Quality Testing Technology Research Institute, Qingdao 266101, China

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Received Date: July 22, 2018
Revised Date: July 07, 2019

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A marine diesel engine crankshaft fractured after running for less than 3 a. The failure analysis was conducted on the crankshaft by mechanical property test, chemical composition analysis, metallographic analysis, fracture observation and finite element analysis. The results show that the fracture property of the crankshaft was fatigue fracture under low stresses. The protective slag involved in the electroslag casting process was the direct reason for fracture of the crankshaft. The substandard tempering and nitriding treatment further reduced the fatigue strength of the crankshaft, and accelerated the propagation of the fatigue cracks, eventually leading to the fracture of the crankshaft.
- diesel engine,
- crankshaft,
- fatigue fracture,
- inclusion,
- failure analysis

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