Microstructure and Mechanical Properties of Linear Friction Welding Joint of GH4169 Alloy/S31042 Steel

doi:10.11900/0412.1961.2020.00271

Acta Metall Sin

2021, Vol. 57

Issue (3): 363-374 DOI: 10.11900/0412.1961.2020.00271

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Microstructure and Mechanical Properties of Linear Friction Welding Joint of GH4169 Alloy/S31042 Steel

LI Yanmo¹^,², GUO Xiaohui¹, CHEN Bin¹, LI Peiyue¹, GUO Qianying², DING Ran², YU Liming²(

), SU Yu³, LI Wenya³

^1.Luoyang Ship Material Research Institute, Luoyang 471000, China
^2.School of Materials Science and Engineering, Tianjin University, Tianjin 300354, China
^3.School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China

Cite this article:

LI Yanmo, GUO Xiaohui, CHEN Bin, LI Peiyue, GUO Qianying, DING Ran, YU Liming, SU Yu, LI Wenya. Microstructure and Mechanical Properties of Linear Friction Welding Joint of GH4169 Alloy/S31042 Steel. Acta Metall Sin, 2021, 57(3): 363-374.

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Abstract

S31042 steel is a typical 25Cr-20Ni type austenitic heat-resistant steel with excellent resistance to oxidation and creep rupture strength near 600^oC. This austenitic steel is widely used as a super-heater or re-heater in ultra-super critical plants with steam specifications as high as 600^oC and 25 MPa. To reduce CO₂ emissions and improve power generation, the application of advanced ultra-super critical plants (steam parameters 700^oC and 30 MPa) can be promoted. Owing to its excellent mechanical properties as well as good corrosion resistance at elevated temperature above 650^oC, GH4169 alloys have the potential to be used in advanced ultra-super critical plants. Practically, it is meaningful to investigate the welding process of GH4169/S31042 dissimilar materials. In this work, the joint between dissimilar materials (S31042/GH4169) was studied by linear friction welding, and the microstructures and mechanical properties of the joint were investigated by OM, SEM, TEM, hardness testing, tensile testing, and creep testing at 700^oC. Good metallurgic bonding was obtained under the optimized welding process parameters of 25 Hz (frequency), 2 mm (amplitude), 100 MPa of frictional pressure, and 150 MPa of forging pressure. Dynamic recrystallization occurred and the secondary phase particles precipitated within the weld zone. The microhardness of the welded joint was higher than that of the base metal, and the tensile properties of the joint were higher than S31042 steel, which is attributed to both fine grain and dispersion strengthening.

Key words: GH4169 alloy S31042 steel linear friction welding recrystallization high-temperature performance

Received: 21 July 2020

ZTFLH:

TG132.33

Fund: National Natural Science Foundation of China(U1660201)

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	Articles by authors
	Yanmo LI
	Xiaohui GUO
	Bin CHEN
	Peiyue LI
	Qianying GUO
	Ran DING
	Liming YU
	Yu SU
	Wenya LI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00271 OR https://www.ams.org.cn/EN/Y2021/V57/I3/363

Fig.1 Appearance of S31042/GH4169 linear friction welded joint

Fig.2 OM image of S31042/GH4169 linear friction welded joint (A—weld zone, B—near-weld line thermo-mechanically affected zone, C—far-weld line thermo-mechanically affected zone, D—heat affected zone, E—parent metal)

Fig.3 SEM images of weld zone (and EDS) (a) and precipitates in GH4169 alloy (b) of S31042/GH4169 linear friction welded joint

Fig.4 TEM images (a, b), HRTEM image (c), and EDS analysis of precipitate (d) of weld zone in GH4169 superalloy (Inset in Fig.3c shows fast Fourier transform (FFT) pattern of TiAl₃)

Fig.5 SEM images of various zones in S31042 steel

Fig.6 TEM image (a) and selected area electron diffraction (SAED) pattern (b) of precipitates in heat affected zone of S31042 steel

Fig.7 SEM images of various zones in GH4169 superalloy

Fig.8 EBSD maps of weld zone and thermo-mechanically affected zone of S31042/GH4169 linear friction welded joint

Fig.9 TEM images of S31042 steel from thermo-mechanically affected zone to weld zone

Fig.10 Microhardness of S31042/GH4169 linear friction welded joint

Fig.11 Engineering stress-strain curves of GH4169 superallloy, S31042 steel, and S31042/GH4169 linear friction welded joint

Fig.12 Full view (a) and SEM fractographies (b, c) of the fractured tensile specimen of S31042/GH4169 linear friction welded joint

Fig.13 Creep strain-time curves of S31042 steel and S31042/GH4169 linear friction welded joint at 700^oC and 200 MPa

Fig.14 Longitudinal sections (a, b) and fractographies (c, d) of fractured creep specimens in S31042 steel (a, c) and S31042/GH4169 linear friction welded joint (b, d)

Fig.15 TEM image (a) and SAED pattern (b) of σ phase in fractured creep specimen of S31042/GH4169 linear friction welded joint

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