摘要
根据舰载飞机起落架的服役条件提出了腐蚀冲击疲劳概念和试验方法。考察了两种起落架材料在盐水中的腐蚀冲击疲劳行为 ,包括冲击疲劳寿命、裂纹萌生与扩展速率。尽管两种材料在空气中的冲击疲劳寿命几乎相等 ,但 30 0 M钢在盐水中的冲击疲劳寿命下降幅度较大。在盐水介质中 ,氢脆加速 30 0 M钢冲击疲劳裂纹的萌生和扩展。局部塑性变形区优先腐蚀促使 AF14 10钢的裂纹萌生 ,盐水对 AF14
According to the severe service conditions of landing gear on carrier-based aircraft, a concept and a test method of corrosion impact fatigue were described. The corrosion impact fatigue behaviors of AF1410 steel and 300M steel were experimentally investigated, including impact fatigue life, fatigue crack initiation and fatigue crack propagation. The decrease in impact fatigue life of 300M steel in 3.5%NaCl solution is greater than that of AF1410 steel, even though they have almost equal impact fatigue life in air. The process of fatigue crack initiation and fatigue crack propagation in 300M steel are promoted in saltwater by a localized hydrogen embrittlement mechanism. Fatigue crack initiation in AF1410 steel is assisted in the aggressive environment by pitting corrosion occurring at the localized plastic deformation zone. Fatigue crack propagation rate of AF1410 steel is not affected by salt aqueous.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2003年第1期3-5,37,共4页
Journal of Materials Engineering
基金
航空基金资助项目