INFLUENCE OF TEMPERATURE ON LOW-CYCLE FATIGUE BEHAVIOR OF INCONEL 625 NICKEL-BASED SUPERALLOY WELDING JOINT

doi:10.11900/0412.1961.2014.00241

Acta Metall Sin

2014, Vol. 50

Issue (12): 1485-1490 DOI: 10.11900/0412.1961.2014.00241

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INFLUENCE OF TEMPERATURE ON LOW-CYCLE FATIGUE BEHAVIOR OF INCONEL 625 NICKEL-BASED SUPERALLOY WELDING JOINT

WANG Yuanyuan^sup1, CHEN Lijia¹(

), WANG Baosen²

1 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870
2 Institute for Welding and Surface Technology of R&D Center, Baoshan Iron & Steel Co. LTD Research Institute, Shanghai 201900

Cite this article:

WANG Yuanyuan, CHEN Lijia, WANG Baosen. INFLUENCE OF TEMPERATURE ON LOW-CYCLE FATIGUE BEHAVIOR OF INCONEL 625 NICKEL-BASED SUPERALLOY WELDING JOINT. Acta Metall Sin, 2014, 50(12): 1485-1490.

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Abstract

The low-cycle fatigue tests of Inconel 625 nickel-based superalloy welding joints at 25 and 760 ℃ were performed . The strain-fatigue life data and cyclic stress-strain data were analyzed to determine the strain fatigue parameters of Inconel 625 superalloy welding joints. The result showed that the relationship between elastic strain amplitude, plastic strain amplitude and reversals to failure could be described by Basquin and Coffin-Manson equations, respectively. Under the strain control, the continuous cyclic softening was observed at 25 ℃, however, the cyclic hardening appeared at 760 ℃. At 25 ℃, the fatigue crack of Inconel 625 superalloy welding joints initiated transgranularly at the specimen surface and propagated in the transgranular mode. Differently, at 760 ℃, the fatigue crack initiated transgranularly at the specimen surface, but propagated in mixed transgranular and intergranular modes.

Key words: Inconel 625 nickel-based superalloy welding joint low-cycle fatigue dislocation twin boundary

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	Yuanyuan WANG
	Lijia CHEN
	Baosen WANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00241 OR https://www.ams.org.cn/EN/Y2014/V50/I12/1485

Fig.1 Cyclic stress response curves of Inconel 625 alloy welding joint under different strain amplitudes at 25 ℃ (a) and 760 ℃ (b)

Fig.2 Total stain amplitude versus fatigue life curves of Inconel 625 alloy welding joint at different temperatures

Fig.3 Plastic (a) and elastic (b) strain amplitudes versus reversals to failure curves for Inconel 625 alloy welding joint at 25 and 760 ℃

Temperature / ℃	$ε ′ f$ / %	c	$σ ′ f$ / MPa	b	K' / MPa	n'
25	105.2	-0.699	1891.1	-1.148	8124.6	0.487
760	505.6	-0.105	1332.6	-0.143	972.6	0.106

Table 1 Strain fatigue parameters of Inconel 625 alloy welding joint at different temperatures

Fig.4 Cyclic stress-strain curves for Inconel 625 welding joint

Fig.5 Micrographs of fatigue fracture surfaces at 25 ℃ for Inconel 625 alloy welding joint (The arrow indicates the surface of specimen )

Fig.6 Micrographs of fatigue fracture surfaces at 760 ℃ for Inconel 625 alloy welding joint (The arrows indicate the surfaces; De_t/2—total strain amplitude)

Fig.7 Microstructures of Inconel 625 alloy welding joint after low-cycle fatigue deformation under strain amplitudes of 0.4% (a) and 1.0% (b) at 25 ℃ (The inset in Fig.7a shows the corresponding SAED pattern)

Fig.8 Microstructures of Inconel 625 alloy welding joint after low-cycle fatigue deformation under strain amplitudes of 0.25% (a) and 0.4% (b) at 760 ℃ (The inset in Fig.8b shows the corresponding SAED pattern)

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