TY - JOUR
T1 - Competing Modes for Crack Initiation from Non-metallic Inclusions and Intrinsic Microstructural Features During Fatigue in a Polycrystalline Nickel-Based Superalloy
AU - Stinville, Jean Charles
AU - Martin, Etienne
AU - Karadge, Mallikarjun
AU - Ismonov, Shak
AU - Soare, Monica
AU - Hanlon, Tim
AU - Sundaram, Sairam
AU - Echlin, McLean L.P.
AU - Callahan, Patrick G.
AU - Lenthe, William C.
AU - Miao, Jiashi
AU - Wessman, Andrew E.
AU - Finlay, Rebecca
AU - Loghin, Adrian
AU - Marte, Judson
AU - Pollock, Tresa M.
N1 - Publisher Copyright:
© 2018, The Minerals, Metals & Materials Society and ASM International.
PY - 2018/9/1
Y1 - 2018/9/1
N2 - Cyclic fatigue experiments in the high and very high cycle fatigue regimes have been performed on a René 88DT polycrystalline nickel-based superalloy. The microstructural configurations that favor early strain localization and fatigue crack initiation at high temperature from 400 °C to 650 °C have been investigated. Competing failure modes are observed in the high to the very high cycle fatigue regime. Fatigue cracks initiate from non-metallic inclusions and from intrinsic internal microstructural features. Interestingly, as stresses are reduced into the very high cycle regime, there is a transition to initiation only at crystallographic facets. At higher stress in the high cycle fatigue regime, a significant fraction of specimens initiate cracks at non-metallic inclusions. This transition is analyzed with regard to microstructural features that favor strain localization and accumulate damage early during cycling.
AB - Cyclic fatigue experiments in the high and very high cycle fatigue regimes have been performed on a René 88DT polycrystalline nickel-based superalloy. The microstructural configurations that favor early strain localization and fatigue crack initiation at high temperature from 400 °C to 650 °C have been investigated. Competing failure modes are observed in the high to the very high cycle fatigue regime. Fatigue cracks initiate from non-metallic inclusions and from intrinsic internal microstructural features. Interestingly, as stresses are reduced into the very high cycle regime, there is a transition to initiation only at crystallographic facets. At higher stress in the high cycle fatigue regime, a significant fraction of specimens initiate cracks at non-metallic inclusions. This transition is analyzed with regard to microstructural features that favor strain localization and accumulate damage early during cycling.
UR - https://www.scopus.com/pages/publications/85049565686
UR - https://www.scopus.com/pages/publications/85049565686#tab=citedBy
U2 - 10.1007/s11661-018-4780-3
DO - 10.1007/s11661-018-4780-3
M3 - Article
AN - SCOPUS:85049565686
SN - 1073-5623
VL - 49
SP - 3865
EP - 3873
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 9
ER -