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Title: Effects of superplastic deformation on the diffusion welding of SuperDux 65 stainless steel

Abstract

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.

Authors:
 [1]; ;  [2]
  1. Chung-Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Mechanical Engineering
  2. National Taiwan Univ., Taipei (Taiwan, Province of China). Inst. of Materials Science and Engineering
Publication Date:
OSTI Identifier:
687473
Resource Type:
Journal Article
Journal Name:
Welding Journal
Additional Journal Information:
Journal Volume: 78; Journal Issue: 9; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHROMIUM-NICKEL STEELS; DEFORMATION; PLASTICITY; SHEAR PROPERTIES; DIFFUSION WELDING

Citation Formats

Yeh, M.S., Tseng, Y.H., and Chuang, T.H. Effects of superplastic deformation on the diffusion welding of SuperDux 65 stainless steel. United States: N. p., 1999. Web.
Yeh, M.S., Tseng, Y.H., & Chuang, T.H. Effects of superplastic deformation on the diffusion welding of SuperDux 65 stainless steel. United States.
Yeh, M.S., Tseng, Y.H., and Chuang, T.H. Wed . "Effects of superplastic deformation on the diffusion welding of SuperDux 65 stainless steel". United States.
@article{osti_687473,
title = {Effects of superplastic deformation on the diffusion welding of SuperDux 65 stainless steel},
author = {Yeh, M.S. and Tseng, Y.H. and Chuang, T.H.},
abstractNote = {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.},
doi = {},
journal = {Welding Journal},
number = 9,
volume = 78,
place = {United States},
year = {1999},
month = {9}
}