Details

Autor(en) / Beteiligte

• Nguyen, Thanh Tuan
• Yoon, Kee Bong
• Vu, Toan Thang
• Park, Jaeyeong
• Baek, Un Bong

Titel

On the changes in the low-cycle-fatigue life and cracking mechanism of P91 cross-weld specimens at elevated temperatures

Ist Teil von

• International journal of fatigue, 2022-06, Vol.159, p.106833, Article 106833

Ort / Verlag

Kidlington: Elsevier Ltd

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •A significant reduction in the fatigue life was observed in tests at 538 and 566 °C compared to that at 25 °C.•The fatigue strength of the cross-weld specimen at elevated temperatures had significantly lower fatigue lives compared to that of the total base specimen.•Fatigue cracking location was shifted from the base metal region at 25 °C to the interface between the intercritical heat-affected zone and base metal at elevated temperatures. A significant reduction in the fatigue life of cross-weld P91 specimens was observed in tests at 538 and 566 °C compared to that at 25 °C. The remarkable reduction of the fatigue strength was directly correlated to the shift of the fatigue cracking locations from the BM region at 25 °C to the interface between the intercritical heat-affected zone (ICHAZ) and BM at elevated temperatures. The low-cycle fatigue (LCF) resistance deterioration mechanisms were attributed to synergic interactions between a high rate of microstructure deterioration accompanied by severe plastic deformation and lower strain hardenability in the ICHAZ region at elevated temperature.