焊丝成分对国产Invar合金GTAW接头组织差异性的影响

doi:10.11896/cldb.23080151

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Abstract The influence of wire composition on the microstructure varieties of joints was studied by using gas tungsten arc welding (GTAW) process. Results showed that the microstructure of welded joint obtained by using the three welding wires are featured coarse columnar crystals grown perpendicular to the fusion lines and equiaxed crystals in the middle of weld, cellular subcrystals in equiaxed crystals are remarkably refined.There was a large differences in the type, morphology and distribution position of precipitated phases formed when using welding wires of different composition.When using the welding wire with 0.40%Ti, more regular bulk particles were precipitated at the grain boundary, and if useing the welding wire with 1.42%Nb, a white chain or columnar continuous phase were precipitated at the subgrain boundary, which not only enabled the core of heterogeneous nucleation or the particle that nails the grain boundary to refine the grain, but also hindered dislocation motion to strengthen the welded joint.The tensile test results showed that the tensile strength of the joints with 0.40%Ti addtion or 1.42%Nb addtion to the welding wire reached 638.2MPa or 653.5 MPa respectively, which are 60.6% and 64.4% higher than that of conventional welding wire.When the specimen was welded with the welding wire that with Nb (1.42%Nb) addition, the size depth of the fracture ligament increased, and the joint fracture mode changed from brittle fracture to ductile fracture, indicating that Nb plays a significant role in the microstructure refinement and mechanical properties improvement of Invar alloy joints.

Key words： domestic Invar alloy wire composition microstructure mechanical properties fracture morphology

Published: 10 December 2024 Online: 2024-12-10

CLC number:

TG422.3

Fund:Special Fund for Basic Scientific Research of the Central Universities (NF2022003).

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	Articles by authors
	CHENG Lihong
	ZHOU Yuqi
	WANG Jianfeng
	LI Zhu
	MU Zhan
	ZHAN Xiaohong

Cite this article:

CHENG Lihong,ZHOU Yuqi,WANG Jianfeng, et al. Effect of Welding Wire Composition on Microstructure Inhomogeneity of Domestic Invar Alloy GTAW Joint[J]. Materials Reports, 2024, 38(23): 23080151-6.

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http://www.mater-rep.com/EN/10.11896/cldb.23080151 OR http://www.mater-rep.com/EN/Y2024/V38/I23/23080151

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