镍基高温合金<strong>GH4169</strong>的热机械疲劳行为

doi:10.11901/1005.3093.2021.549

材料研究学报

2023, Vol. 37

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

研究论文

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镍基高温合金GH4169的热机械疲劳行为

钱春华(

), 崔海涛, 温卫东

南京航空航天大学能源与动力学院南京 210016

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

引用本文:

钱春华, 崔海涛, 温卫东. 镍基高温合金GH4169的热机械疲劳行为[J]. 材料研究学报, 2023, 37(2): 145-151.
Chunhua QIAN, Haitao CUI, Weidong WEN. Investigation on Thermo-mechanical Fatigue Behavior of GH4169 Alloy[J]. Chinese Journal of Materials Research, 2023, 37(2): 145-151.

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摘要:

在不同温度区间、不同条件下进行GH4169合金的热机械疲劳实验测试其热机械疲劳数据，研究了这种合金的热机械疲劳行为。结果表明：GH4169合金在热机械条件下的迟滞回线具有明显的拉压不对称性；同相位时材料承受压应力，反相位时承受拉应力。拉应力，是影响疲劳寿命的主要因素。应变幅较高时GH4169合金出现平均应力松弛，在高温半周为先循环软化后循环稳定，在低温半周始终趋于循环稳定。

关键词 ：金属材料, 热机械疲劳, GH4169, 循环应力应变特性, 响应特性

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

收稿日期: 2021-09-22

ZTFLH:

TB 302.3

作者简介: 钱春华，男，1984年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.549 或 https://www.cjmr.org/CN/Y2023/V37/I2/145

表1 GH4169合金的化学成分

图1 试件尺寸

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

表2 不同实验条件下的热机械疲劳实验结果

图2 不同试验条件下的稳定滞回曲线

图3 不同实验条件下的滞回曲线

图4 循环应力响应曲线

图5 应变-寿命关系

图6 周期-寿命关系

图7 GH4169的断口形貌(同相位、应变幅±0.6%、400~650℃)

图8 GH4169的断口形貌(反相位、应变幅±0.6%、400~650℃)

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