紀要論文

紀要論文

text

Transactions of JWRI. 2007, 36(2), p. 81-86

Residual Stress of Steels for Structure and Filet Weld Zone after Laser Peening

英語

text

2007-12

Laser peening is an innovative surface enhancement technology to introduce a compressive residual stress in metallic materials. Experimental results showed that laser peening was effective in preventing SCC and enhancing fatigue strength. However the effects of laser peening on steels for structure and their welded zone are not completely clarified. In this paper, laser peening conditions for four grades of steels for structure were examined. Moreover residual stress of the fillet weld zone after laser peening was investigated by comparing it with that before laser peening. X-ray diffraction was used to measure the residual stress. Main results are summarized as follows. 1) Laser peening affects steel hardness up to the depth of 0.6mm. 2) Laser peening conditions for over 400kN/㎟ grade steels were selected as 200 mJ laser pulse energy, 8 ns pulse duration, 0.8 mm spot diameter and 3600 pulse/㎠ irradiation pulse density. 3) Laser peening can change tensile residual stress to large compressive residual stress in the welding zone. The nearer to the welding toe, the larger this effect by laser peening became.

10.18910/10451

10451

Residual Stress of Steels for Structure and Filet Weld Zone after Laser Peening

大阪大学接合科学研究所

英語

2007-12

Transactions of JWRI

36

2

81

86

https://hdl.handle.net/11094/10451

10.18910/10451

https://doi.org/10.18910/10451