Effects of Welding Speed on Microstructure and Properties of 304 Stainless Steel Electron Beam Welded Joint

YANG Tao; YUAN Mengyang; JIAN Hailin; LI Dong

doi:10.11973/jxgccl202112006

Materials and Mechanical Engineering > 2021 > 45(12): 31-35. > DOI: 10.11973/jxgccl202112006

YANG Tao, YUAN Mengyang, JIAN Hailin, LI Dong. Effects of Welding Speed on Microstructure and Properties of 304 Stainless Steel Electron Beam Welded Joint[J]. Materials and Mechanical Engineering, 2021, 45(12): 31-35. DOI: 10.11973/jxgccl202112006

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Effects of Welding Speed on Microstructure and Properties of 304 Stainless Steel Electron Beam Welded Joint

1. State Nuclear Power Plant Service Company, Shanghai 200233, China;
2. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

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Received Date: September 26, 2021
Revised Date: November 18, 2021

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Abstract

304 stainless steel plates with thickness of 3 mm were welded by vacuum electron beam welding under accelerating voltage of 120 kV, focus current of 2 460 mA, and welding current of 12 mA.The effects of welding speed (10-40 mm·s^-1)on microstructure and mechanical properties of the joints were studied.The results show that microstructures of the weld mainly consisted of columnar grains at both sides and equiaxed grains in center.With increasing welding speed, the grains size of the weld decreased, the volume fraction of ferrite increased, the hardness of all areas in joints increased, the tensile strength increased first and then decreased, and the fracture of joints all occurred at base metal after tension.Under the experimental conditions, the optimal welding speed for 304 stainless steel by the vacuum electron beam welding was 30 mm·s^-1; at this time the welded joint had good forming quality with ferrite volume fraction of 7.4%, relatively high hardness, and the largest tensile strength of 640 MPa; the tensile fracture showed the characteristics of ductile fracture.
- 304 stainless steel,
- vacuum electron beam welding,
- welding speed,
- ferrite content,
- tensile property

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