Effects of superplastic deformation on the diffusion welding of SuperDux 65 stainless steel
- Chung-Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Mechanical Engineering
- National Taiwan Univ., Taipei (Taiwan, Province of China). Inst. of Materials Science and Engineering
The SuperDux 65 stainless steel diffusion welded in a nonsuperplastic state (880 C, 60 min) required greater pressure, compared to aluminum and titanium alloys, to create a contact area at the weld interface, which will increase the atomic diffusion paths. However, an unsatisfactory weld strength of 45.3 MPa was obtained under the applied pressure of 7 MPa. This alloy deformed easily at its superplastic temperature of 970 C, resulting in a tight contact surface. The higher welding temperature was also beneficial for atomic diffusion. Both effects were advantageous for diffusion welding, while the joined workpieces macroscopically deformed markedly. In this study, a two-stage diffusion welding method was proposed. The specimens were diffusion welded in a nonsuperplastic (or superplastic) state for a short time and then further diffusion welded at superplastic (or nonsuperplastic) temperatures for a longer heating period. It was found that the welding strength could be improved drastically using such a two-stage process. The contributions of superplastic deformation on the diffusion welding of this alloy during the two-stage process were clarified.
- OSTI ID:
- 687473
- Journal Information:
- Welding Journal, Vol. 78, Issue 9; Other Information: PBD: Sep 1999
- Country of Publication:
- United States
- Language:
- English
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