Investigation on Thermo-mechanical Fatigue Behavior of GH4169 Alloy

doi:10.11901/1005.3093.2021.549

Chinese Journal of Materials Research

2023, Vol. 37

Issue (2): 145-151 DOI: 10.11901/1005.3093.2021.549

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Investigation on Thermo-mechanical Fatigue Behavior of GH4169 Alloy

QIAN Chunhua(

), CUI Haitao, WEN Weidong

College of Energy and Power Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China

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QIAN Chunhua, CUI Haitao, WEN Weidong. Investigation on Thermo-mechanical Fatigue Behavior of GH4169 Alloy. Chinese Journal of Materials Research, 2023, 37(2): 145-151.

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Abstract

The thermo-mechanical fatigue behavior of GH4169 alloy was investigated via MTS809 fatigue testing machine by applied multiple test loads at different temperature range. It is found that the hysteresis loops of GH4169 alloy have obvious asymmetry in tension and compression under thermo-mechanical condition. The material bears compressive stress when the mechanical strain amplitude in phase, whilst tensile stress for out of phase. The tensile stress is the main cause affecting the fatigue life. The average stress relaxation occurs at higher strain amplitude. In the high temperature half cycle, the alloy softens first and then becomes stable. In the low temperature half cycle, the alloy tends to be stable.

Key words: metallic materials thermo-mechanical fatigue GH4169 cyclic stress-strain characteristics cyclic stress response

Received: 22 September 2021

ZTFLH:

TB 302.3

About author: QIAN Chunhua, Tel: 15261896806, E-mail: nuaaqch@163.com

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	Chunhua QIAN
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https://www.cjmr.org/EN/10.11901/1005.3093.2021.549 OR https://www.cjmr.org/EN/Y2023/V37/I2/145

Table 1 Chemical composition of GH4169 alloy (mass fraction, %)

Fig.1 Specimen size (unit: mm)

Phase	ΔT/℃	$12$ Δε_m/%	T/s	N	Δε_p/%	σ_max/MPa	σ_min/MPa	σ_m/MPa
IP	200~ 450	0.6	125	2701	0.440	406	-600	-194
		0.7		1747	0.442	504	-723	-219
		0.8		103	0.446	580	-866	-286
		0.9		55	0.898	636	-736	-100
IP	400~ 650	0.6	100	165	0.105	840	-998	-158
		0.6	125	50	0.103	735	-937	-202
		0.6	200	27	0.068	820	-1030	-210
OP	400~ 650	0.55	125	196	0.471	816	-705	111
OP	400~ 650	0.6	125	170	0.393	1118	-868	250

Table 2 Thermomechanical fatigue test results under different test conditions

Fig.2 Stable hysteresis curves under different test conditions (a) 200~450℃, T=125 s, IP; (b) 400~650℃, strain 0.6%, IP; (c) 400~650℃, T=125 s, OP

Fig.3 Hysteresis curves under different test conditions (a) 200~450℃, 0.8%, T=125 s, IP; (b) 200~450℃, 0.6%, T=125 s, IP; (c) 400~650℃, 0.6%, T=100 s, IP; (d) 400~650℃, 0.6%, T=125 s, OP

Fig.4 Cyclic stress response curves (a) 400~650℃, IP; (b) 400~650℃, OP

Fig.5 Strain-life relationship

Fig.6 Cycle-life relationship

Fig.7 Fracture morphology of GH4169 (IP, strain amplitude ±0.6%, 400~650℃), (a) fatigue source; (b) propagation zone; (c) final rupture regions

Fig.8 Fracture morphologies of GH4169 (OP, strain amplitude ±0.6%, 400~650℃) (a) fatigue source; (b) propagation zone; (c) final rupture regions

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