海洋环境与疲劳载荷联合作用下喷丸超高强度钢损伤机制

doi:10.7527/S1000-6893.2020.23631

固体力学与飞行器总体设计

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海洋环境与疲劳载荷联合作用下喷丸超高强度钢损伤机制

谭晓明, 张丹峰, 战贵盼, 王德

海军航空大学青岛校区, 青岛 266041

收稿日期:2019-11-03 修回日期:2020-01-06 出版日期:2020-08-15 发布日期:2020-02-21
通讯作者: 谭晓明 E-mail:txm_qd@126.com

Damage mechanism of shot peened ultra-high strength steel under combined action of marine environment and fatigue load

TAN Xiaoming, ZHANG Danfeng, ZHAN Guipan, WANG De

Qingdao Branch of Naval Aeronautical University, Qingdao 266041, China

Received:2019-11-03 Revised:2020-01-06 Online:2020-08-15 Published:2020-02-21

摘要/Abstract

摘要： 舰载机起落架结构既要遭受海洋大气、海上盐雾和海浪飞溅等严酷海洋环境的侵蚀作用，又要承受较大的弹射起飞/拦阻着舰载荷，在海洋环境与疲劳载荷联合作用下超高强度钢起落架结构承载能力显著劣化，对使用安全构成严重挑战。针对超高强度钢喷丸和未喷丸两种试验件，基于舰载机服役的海洋环境，开展了腐蚀+疲劳交替试验和预腐蚀疲劳试验研究，得到了疲劳寿命变化规律，通过粗糙度、晶粒度、显微硬度、残余应力和疲劳断口分析，揭示了喷丸对疲劳寿命增强的作用机制、腐蚀+疲劳损伤交替作用机制和预腐蚀疲劳损伤作用机制。结果表明，喷丸强化后疲劳寿命平均增幅为93.1%；对于喷丸试验件，深度约为20 μm的轻微点蚀，导致疲劳寿命衰减幅度达到30%；喷丸强化与腐蚀两者之间存在着此消彼长的竞争机制；腐蚀+疲劳交替作用损伤机制对该型超高强度钢造成的疲劳寿命衰减要比预腐蚀疲劳损伤机制严重得多，加速腐蚀试验时间相同的条件下前者疲劳寿命为后者的47%~54%。

关键词: 超高强度钢, 海洋环境, 喷丸, 腐蚀, 疲劳寿命, 损伤机制

Abstract: The landing gear structure of carrier-based aircraft is subject to not only erosion by marine atmosphere, salt spray and sea wave splashes, but also large ejection take off and arresting landing load. Under the combined action of marine environment and fatigue load, the bearing capacity of ultra-high strength steel landing gear structure is significantly deteriorated, posing a serious challenge to its safe use. Based on the marine environment in which the carrier-based aircraft is in service, corrosion fatigue tests were conducted on two kinds of test specimens of ultra-high strength steel: shot peened and unpeened. The variation rule of fatigue life was obtained. Through the analysis of roughness, grain size, micro-hardness, residual stress and fatigue fracture, the action mechanism of shot peening on fatigue life enhancement, the mechanism of alternate action of corrosion and fatigue damage and the mechanism of pre-corrosion fatigue damage were revealed. The results show an average increase of 93.1% in fatigue life after shot peening. For the shot peened specimen, a slight pitting with a depth of about 20 μm results in a fatigue life decay of about 30%. A competition mechanism exists between shot peening and corrosion. The damage mechanism of alternating corrosion and fatigue has a considerably more serious effect on the service life of the ultra-high strength steel than the pre-corrosion fatigue damage mechanism. Under the same conditions, the fatigue life of the former is only 47%-54% of that of the latter.

Key words: ultra-high strength steel, marine environment, shot peening, corrosion, fatigue life, damage mechanism

中图分类号:

V215

谭晓明, 张丹峰, 战贵盼, 王德. 海洋环境与疲劳载荷联合作用下喷丸超高强度钢损伤机制[J]. 航空学报, 2020, 41(8): 223631-223631.

TAN Xiaoming, ZHANG Danfeng, ZHAN Guipan, WANG De. Damage mechanism of shot peened ultra-high strength steel under combined action of marine environment and fatigue load[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(8): 223631-223631.

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海洋环境与疲劳载荷联合作用下喷丸超高强度钢损伤机制

Damage mechanism of shot peened ultra-high strength steel under combined action of marine environment and fatigue load

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