Analysis on the failure mechanism of flying hammers in nuclear power plant steam turbines

Yunting Lai; Yan Li; Shangyu Li; Dungui Zuo; Xianliang Liu

doi:10.1117/12.3007193

25 October 2023 Analysis on the failure mechanism of flying hammers in nuclear power plant steam turbines

Yunting Lai, Yan Li, Shangyu Li, Dungui Zuo, Xianliang Liu

Proceedings Volume 12801, Ninth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2023); 128014V (2023) https://doi.org/10.1117/12.3007193
Event: Ninth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2023), 2023, Dalian, China

Abstract

In response to the failure of the steam turbine flying hammer in a nuclear power plant, macroscopic inspection, chemical composition analysis, microhardness testing, metallographic examination, and fracture microscopic analysis were conducted to study the failure mechanism of the flying hammer. The results indicate that the failure mechanism of the flying hammer is welding hot cracks. The main reason for the failure of the flying hammer is poor welding process control, which leads to the initiation of welding hot cracks at the lack of penetration of the welding root with relatively high residual stress. In addition, the microstructure of the flying hammer base material is poor, and there are many carbides and obvious segregation that promote the initiation of welding hot cracks. During the operation of the flying hammer, the hot cracks expand and ultimately fail through the wall thickness

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yunting Lai, Yan Li, Shangyu Li, Dungui Zuo, and Xianliang Liu "Analysis on the failure mechanism of flying hammers in nuclear power plant steam turbines", Proc. SPIE 12801, Ninth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2023), 128014V (25 October 2023); https://doi.org/10.1117/12.3007193

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