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7 February 2000 Laser desensitization treatment for inside surface of SUS304 stainless steel pipe welds
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Proceedings Volume 3888, High-Power Lasers in Manufacturing; (2000)
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan
The purpose of this study was to develop a technology for preventing the occurrence of Intergranular Stress Corrosion Cracking (IGSCC) by irradiating a high power YAG laser beam onto the sensitized Heat Affected Zone (HAZ) surface of SUS304 stainless steel. By irradiating a laser beam of the appropriate power density, a laser de-sensitization heat treatment (LDT) process was realized that formed both a molten layer of approximately 0.2 mm depth and a solution heat treated layer. The results of a Creviced Bent Beam (CBB) test to evaluate IGSCC showed that no cracks had appeared on the surface of the LDT parts. Also, after LDT was applied at a width of 40 mm in the vicinity of welding joints in the inside surface of pipes (thickness: 8 mm), approximately 250 MPa of tensile stress was measured as a residual stress on this LDT- processed surface. On the other hand, the tensile stress on the outside surface of these pipes decreased to the compression stress.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Seiichiro Kimura, Wataru Kono, Syohei Kawano, and Rie Sumiya "Laser desensitization treatment for inside surface of SUS304 stainless steel pipe welds", Proc. SPIE 3888, High-Power Lasers in Manufacturing, (7 February 2000);

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