Details

Autor(en) / Beteiligte

• Geng, Yongxiang
• Dong, Xia
• Wang, Kedian
• Yan, Xin
• Duan, Wenqiang
• Fan, Zhengjie
• Wang, Wenjun
• Mei, Xuesong

Titel

Effect of microstructure evolution and phase precipitations on hot corrosion behavior of IN718 alloy subjected to multiple laser shock peening

Ist Teil von

• Surface & coatings technology, 2019-07, Vol.370, p.244-254

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• High-temperature hot corrosion experiments of IN718 alloy subjected to multiple laser shock peening (LSP) were conducted by coating a salt mixture (75 wt% Na2SO4 + 25 wt% NaCl) on its surfaces at 700, 800 and 900 °C for 10 cycles. The effect of microstructure evolution and phase precipitations on high-temperature hot corrosion behavior of the specimens was investigated. Results showed that high-temperature hot corrosion behavior is associated with δ phase precipitations. Excessive δ phase precipitations significantly accelerate hot corrosion at 900 °C due to Na-containing oxides formation. According to corrosion kinetics, multiple LSP treated specimens exhibit lower mass loss compared with untreated specimens, indicating multiple LSP can relieve high-temperature hot corrosion. This is mainly attributed to crystal defects, which promote outward diffusion of Cr generating protective Cr-rich oxides. •High-temperature hot corrosion tests were conducted in LSP treated IN718 alloy.•δ phase precipitations were considered during high-temperature hot corrosion.•Excessive δ phase precipitations led to severe high-temperature hot corrosion.