Oxidation-Assisted Crack Growth in Single-Crystal Superalloys during Fatigue with Compressive Holds

被引：18
作者：
Lafata, M. A. [1 ]
Rettberg, L. H. [2 ]
He, M. Y. [1 ]
Pollock, T. M. [1 ]
机构：
[1] Univ Calif Santa Barbara, Mat Dept, Bldg 503,Rm1355, Santa Barbara, CA 93106 USA
[2] Pratt & Whitney, 400 Main St,M-S 114-41, E Hartford, CT 06108 USA
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2018年 / 49A卷 / 01期
关键词：
NICOCRALY BOND COAT; LOW-CYCLE FATIGUE; IN-SITU; DIFFUSION; MICROSTRUCTURE; DEGRADATION; THETA-AL2O3; MECHANISM; PRESSURE; ALUMINUM;
D O I：
10.1007/s11661-017-4392-3
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The mechanism of oxidation-assisted growth of surface cracks during fatigue with compressive holds has been studied experimentally and via a model that describes the role of oxide and substrate properties. The creep-based finite element model has been employed to examine the role of material parameters in the damage evolution in a Ni-base single-crystal superalloy Ren, N5. Low-cycle fatigue experiments with compressive holds were conducted at 1255 K and 1366 K (982 A degrees C and 1093 A degrees C). Interrupted and failed specimens were characterized for crack depth and spacing, oxide thickness, and microstructural evolution. Comparison of experimental to modeled hysteresis loops indicates that transient creep drives the macroscopic stress-strain response. Crack penetration rates are strongly influenced by growth stresses in the oxide, structural evolution in the substrate, and the development of denuded zones. Implications for design of alloys resistant to this mode of degradation are discussed. (C) The Minerals, Metals & Materials Society and ASM International 2017
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页码：105 / 116
页数：12
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