パルスレーザ照射による残留応力形成メカニズムの検討(2) : 放射光によるレーザ照射部の残留応力分布測定(S06-3 放射光応力評価の実用化,S06 放射光による応力測定と残留応力評価)

概要

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Detailed distributions of residual stress were measured across laser-irradiated spots on high tensile strength steel (HT1000) using synchrotron radiation source. Tensile residual stress was developed on the spot, while compressive one was observed outside. The overall residual stress gradually decreased toward compressive side by increasing laser pulses irradiated on the same spot. The irradiation of the smaller energy and spot size with a constant energy density resulted in the remarkable decrease in surface tensile stress on the spot after single pulse. It is considered that the cooling effect was enhanced and consequently the thermal effect on material was decreased by making the irradiation spot small.
社団法人日本機械学会の論文
2004-09-04