期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 119, 期 -, 页码 261-267出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2018.10.012
关键词
Laser shock processing; Deep cryogenic treatment; Residual stress; Fatigue; Super alloy
资金
- National Major Science and Technology Project of China [2017ZX04011009]
- National Natural Science Foundation of China [51575029]
To achieve better fatigue behavior for super alloy GH4169 parts, residual compressive stresses in surface layers were expected by machining or other manufacturing method. Both laser shock processing (LSP) and deep cryogenic treatment (DCT) were thought as residual stress improvement methods, but their influences on fatigue life were still inexplicit and need further investigation. Four groups of standard specimens are manufactured to study their residual stresses distribution and micro structure of their surfaces on fatigue behavior. To avoid LSP's disadvantage in application, a hybrid manufacturing method of laser shock processing with post-machining (LSPM) was proposed. Results shows that fatigue life for specimens increased more than twofold after LSPM, whereas DCT brought reductions in fatigue life.
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