The effects of inhomogeneous microstructure and loading waveform on creep-fatigue behaviour in a forged and precipitation hardened nickel-based superalloy

被引：42
|
作者：
Wang, Run-Zi [1 ]
Bo-Chen [2 ]
Zhang, Xian-Cheng [1 ]
Tu, Shan-Tung [1 ]
Ji-Wang [1 ]
Zhang, Cheng-Cheng [3 ]
机构：
[1] East China Univ Sci & Technol, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China
[2] Coventry Univ, Fac Engn Environm & Comp, Inst Adv Mfg & Engn, Coventry CV6 5LZ, W Midlands, England
[3] AECC Commercial Aircraft Engine Co LTD, Shanghai Engn Res Ctr Commercial Aircraft Engine, Shanghai 201108, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2017年 / 97卷
关键词：
Creep-fatigue; Nickel-based superalloy; Microstructure; Failure mechanism; Oxidation; LOW-CYCLE FATIGUE; 9CR-1MO MARTENSITIC STEEL; INCONEL; 718; INTERGRANULAR OXIDATION; DYNAMIC EMBRITTLEMENT; ANNEALING TWINS; STRAIN FATIGUE; CRACK-GROWTH; PART II; TEMPERATURE;
D O I：
10.1016/j.ijfatigue.2017.01.002
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The aim of the present paper is to identify the effects of sampling locations and loading waveforms on high-temperature low-cycle fatigue (HTLCF) and creep-fatigue life of a forged and precipitation hardened nickel-based GH4169 superalloy. Both the deformation and failure mechanisms are considered here. It has been revealed that HTLCF and creep-fatigue life of specimens were influenced by inhomogeneous microstructures at different locations. Compared with the HTLCF tests, the presence of dwell times in creep-fatigue tests tended to reduce number of cycles to failure. Intergranular damage was observed at both crack initiation and propagation stages. For the dwell times under tension, the intergranular damage was mainly associated with precipitate-assist voids. However, oxidation accounted for the presence of intergranular damage for the dwell times under compression. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：190 / 201
页数：12
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