Experimental investigation and life prediction of hot corrosion pre-exposure on low-cycle fatigue of a directionally solidified nickel-base superalloy

Autor:	Ji-Shen Yang, Duo Qi Shi, Xiaoguang Yang, L. Q. Ma, Hongyu Qi, Shaolin Li
Rok vydání:	2015
Předmět:	Superalloy Materials science Continuum damage mechanics Mechanics of Materials Mechanical Engineering Metallurgy Alloy Nickel base engineering General Materials Science Low-cycle fatigue engineering.material Corrosion
Zdroj:	Fatigue & Fracture of Engineering Materials & Structures. 38:1155-1166
ISSN:	8756-758X
DOI:	10.1111/ffe.12295
Popis:	Low-cycle fatigue tests were conducted on the directionally solidified nickel-base super- alloy DZ125 at 850°C in the unexposed and exposed specimens for 2, 15, 25 and 50h in hot corrosion environment. The pre-exposed specimen exhibited a lower life than unex- posed specimens. Fatigue cracks in the unexposed specimens are initiated from defects near the surface, while the cracks of exposed specimens preferentially occur on the sur- face. Hot corrosion damage in fatigue life was found to be associated with the reduction of the bearing area. A novel life prediction methodology based on continuum damage mechanics was proposed to predict the experimentally observed decrease in low-cycle fa- tigue life with increasing prior exposure time.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bc6f389986c7bd23e6824228d2d68c99 https://doi.org/10.1111/ffe.12295 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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