Low-temperature hot corrosion effects on the low-cycle fatigue lifetime and cracking behaviors of a powder metallurgy Ni-based superalloy

被引：15
作者：
Li, Shaolin
Yang, Xiaoguang
Qi, Hongyu [1 ]
Song, Jianan [1 ]
Shi, Duoqi
机构：
[1] Beihang Univ, Sch Energy & Power Engn, Beijing 100191, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2018年 / 116卷
基金：
中国国家自然科学基金;
关键词：
Corrosion fatigue; Failure analysis; Fatigue behavior; Fracture; Crack initiation; NICKEL; RESISTANCE; FGH96; PIT; ENVIRONMENT; TRANSITION; MECHANISMS; INCLUSIONS; NUCLEATION; OXIDATION;
D O I：
10.1016/j.ijfatigue.2018.06.035
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
In this paper, low-cycle fatigue (LCF) experiments were conducted to analyze the influence of low-temperature hot corrosion on the LCF behavior of the powder metallurgy Ni-based superalloy FGH96 at 700 degrees C. The LCF lifetime of the salt-coated samples was drastically lower than that of bare samples. The low-temperature hot corrosion would change the crack initiation mode (from subsurface defects to corrosion pits) and early propagation modes (from transgranular to intergranular). Moreover, the degradation mechanism of hot corrosion in the LCF lifetime was connected with early crack initiation resulting both from the deteriorated surface because of corrosion pits and the accelerated fatigue crack propagation due to weakened grain boundaries.
引用
收藏
页码：334 / 343
页数：10
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