Failure Reason of the Blade of Top Gas Energy Recovery Turbine

LIU Mingxia; CHANG Gengrong; FU Fuxing; HE Binfeng; MA Fei; CHEN Mingke; YU Lijun; DAI Jun; XU Kewei

doi:10.11973/jxgccl201801018

Materials and Mechanical Engineering > 2018 > 42(1): 89-94. > DOI: 10.11973/jxgccl201801018

LIU Mingxia, CHANG Gengrong, FU Fuxing, HE Binfeng, MA Fei, CHEN Mingke, YU Lijun, DAI Jun, XU Kewei. Failure Reason of the Blade of Top Gas Energy Recovery Turbine[J]. Materials and Mechanical Engineering, 2018, 42(1): 89-94. DOI: 10.11973/jxgccl201801018

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Failure Reason of the Blade of Top Gas Energy Recovery Turbine

1. Shaanxi Key Laboratory of Surface Engineering and Remanufacturing, School of Mechanical & Material Engineering, Xi'an University, Xi'an 710065, China;
2. State Key Lab for Mechanical Behavior of Materials, School of Material Engineering, Xi'an Jiaotong University, Xi'an 710049, China

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Received Date: October 13, 2016
Revised Date: October 09, 2017

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Cracks were found in the first and second stage rotor blade root section of a wet-typed top gas energy recovery turbine (TRT) after operation for 3 a. In order to investigate the cause for cracks, the failure analysis of the blade was performed by macroscopic morphology observation, chemical composition analysis, tensile property test and microscopic morphology observation. The results show that the blade failure was a typical corrosion fatigue damage. The cracks were located in the middle of the first tenon of the blade root. The cracks were initiated from corrosion pits on the contact surface of blade root and shaft groove. Under the effect of complex alternating stress, cracks propagated further, which eventually led to the abnormal vibration and the shut-down of the TRT.
- top gas energy recovery turbine,
- blade,
- crack,
- corrosion fatigue,
- alternating stress

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