Fatigue behavior of uncoated and MCrAlY-coated DS nickel-based superalloys pre-exposed in hot corrosion condition

Hong Yu Qi; Ji Shen Yang; Xiao Guang Yang; Shao Lin Li; Li Qiang Ma

doi:10.1007/s12598-016-0867-4

Fatigue behavior of uncoated and MCrAlY-coated DS nickel-based superalloys pre-exposed in hot corrosion condition

Hong Yu Qi
, Ji Shen Yang
, Xiao Guang Yang^*
, Shao Lin Li
, Li Qiang Ma

^*Corresponding author for this work

School of Energy and Power Engineering

Collaborative Innovation Center for Advanced Aero-Engine
Beijing Key Laboratory of Aero-Engine Structure and Strength
Beihang University
Shenyang Aerospace University

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

The effects of a MCrAlY coating on low-cycle fatigue (LCF) behavior of directionally solidified (DS) nickle-based superalloy DZ125 were investigated. Before the fatigue testings, the specimens were pre-exposed in high-temperature hot corrosion (HTHC) environment generating by a burner rig at 850 °C. The results show that the coating in hot corrosion condition has beneficial effects on the fatigue resistance of superalloy. Under corrosion condition, the MCrAlY-coated specimens tested have higher fatigue lives than the uncoated specimens at the same stress level. The coating failure results from fatigue process and numerous fatigue cracks were nucleated at the specimen surface, only one main crack propagates inward and the secondary cracks away from the fracture surface are perpendicular to the loading orientation.

Original language	English
Pages (from-to)	936-941
Number of pages	6
Journal	Rare Metals
Volume	37
Issue number	11
DOIs	https://doi.org/10.1007/s12598-016-0867-4
State	Published - 1 Nov 2018

Keywords

Directionally solidified Ni-based superalloy
Hot corrosion
Low-cycle fatigue
MCrAlY coating
Prior exposure

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10.1007/s12598-016-0867-4

Cite this

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title = "Fatigue behavior of uncoated and MCrAlY-coated DS nickel-based superalloys pre-exposed in hot corrosion condition",

abstract = "The effects of a MCrAlY coating on low-cycle fatigue (LCF) behavior of directionally solidified (DS) nickle-based superalloy DZ125 were investigated. Before the fatigue testings, the specimens were pre-exposed in high-temperature hot corrosion (HTHC) environment generating by a burner rig at 850 °C. The results show that the coating in hot corrosion condition has beneficial effects on the fatigue resistance of superalloy. Under corrosion condition, the MCrAlY-coated specimens tested have higher fatigue lives than the uncoated specimens at the same stress level. The coating failure results from fatigue process and numerous fatigue cracks were nucleated at the specimen surface, only one main crack propagates inward and the secondary cracks away from the fracture surface are perpendicular to the loading orientation.",

keywords = "Directionally solidified Ni-based superalloy, Hot corrosion, Low-cycle fatigue, MCrAlY coating, Prior exposure",

author = "Qi, \{Hong Yu\} and Yang, \{Ji Shen\} and Yang, \{Xiao Guang\} and Li, \{Shao Lin\} and Ma, \{Li Qiang\}",

note = "Publisher Copyright: {\textcopyright} 2017, The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg.",

year = "2018",

month = nov,

day = "1",

doi = "10.1007/s12598-016-0867-4",

language = "英语",

volume = "37",

pages = "936--941",

journal = "Rare Metals",

issn = "1001-0521",

publisher = "John Wiley and Sons Inc",

number = "11",

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TY - JOUR

T1 - Fatigue behavior of uncoated and MCrAlY-coated DS nickel-based superalloys pre-exposed in hot corrosion condition

AU - Qi, Hong Yu

AU - Yang, Ji Shen

AU - Yang, Xiao Guang

AU - Li, Shao Lin

AU - Ma, Li Qiang

PY - 2018/11/1

Y1 - 2018/11/1

N2 - The effects of a MCrAlY coating on low-cycle fatigue (LCF) behavior of directionally solidified (DS) nickle-based superalloy DZ125 were investigated. Before the fatigue testings, the specimens were pre-exposed in high-temperature hot corrosion (HTHC) environment generating by a burner rig at 850 °C. The results show that the coating in hot corrosion condition has beneficial effects on the fatigue resistance of superalloy. Under corrosion condition, the MCrAlY-coated specimens tested have higher fatigue lives than the uncoated specimens at the same stress level. The coating failure results from fatigue process and numerous fatigue cracks were nucleated at the specimen surface, only one main crack propagates inward and the secondary cracks away from the fracture surface are perpendicular to the loading orientation.

AB - The effects of a MCrAlY coating on low-cycle fatigue (LCF) behavior of directionally solidified (DS) nickle-based superalloy DZ125 were investigated. Before the fatigue testings, the specimens were pre-exposed in high-temperature hot corrosion (HTHC) environment generating by a burner rig at 850 °C. The results show that the coating in hot corrosion condition has beneficial effects on the fatigue resistance of superalloy. Under corrosion condition, the MCrAlY-coated specimens tested have higher fatigue lives than the uncoated specimens at the same stress level. The coating failure results from fatigue process and numerous fatigue cracks were nucleated at the specimen surface, only one main crack propagates inward and the secondary cracks away from the fracture surface are perpendicular to the loading orientation.

KW - Directionally solidified Ni-based superalloy

KW - Hot corrosion

KW - Low-cycle fatigue

KW - MCrAlY coating

KW - Prior exposure

UR - https://www.scopus.com/pages/publications/85015798155

U2 - 10.1007/s12598-016-0867-4

DO - 10.1007/s12598-016-0867-4

M3 - 文章

AN - SCOPUS:85015798155

SN - 1001-0521

VL - 37

SP - 936

EP - 941

JO - Rare Metals

JF - Rare Metals

IS - 11

ER -

Fatigue behavior of uncoated and MCrAlY-coated DS nickel-based superalloys pre-exposed in hot corrosion condition

Abstract

Keywords

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