Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 152, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2021.106460
Keywords
Weld metal; Long term service; P segregation; Fatigue crack growth; Threshold value
Funding
- National Natural Science Founda-tion of China [51901113, 51775300]
- Shuimu Tsinghua Scholar Program of Tsinghua University [2019SM065]
- Shanghai Turbine Company, Shanghai, China
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The study revealed that phosphorus segregation at prior austenite grain boundaries can cause local intergranular fracture and high crack growth rates in the turbine part weld metal, but has little effect on near-threshold fatigue crack growth and Delta Kth in the compressor part weld metal.
Fatigue crack growth (FCG) behaviors of weld metal (WM) in turbine part and WM in compressor part of a gas turbine rotor after 14 years of service were investigated. Phosphorus (P) segregation at prior austenite grain (PAG) boundaries occurred in the turbine part WM but not in the compressor part WM, which resulted in local intergranular fracture and high da/dN in Paris regime of the turbine part WM. However, P segregation at PAG boundaries had little effect on near-threshold FCG and Delta Kth because the cyclic plastic zone sizes were much smaller than PAG sizes and cracks mainly grew inside PAGs.
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