TY - JOUR
T1 - Residual stress improvement of nickel base superalloy alloy 706 by laser peening
AU - Chida, Itaru
AU - Sumiya, Rie
AU - Yoshioka, Yomei
AU - Saito, Daizo
AU - Sawa, Tetsu
AU - Kobayashi, Daisuke
AU - Ito, Akihiro
AU - Miyabe, Masamichi
AU - Kagiya, Yukio
PY - 2013
Y1 - 2013
N2 - Some cracks were found at the first stage discs of gas turbine rotors made of Ni-base superalloy. There were inter-granular cracking and observed to be highly stressed and damage sensitive locations with less potential for oxidation, which is thought to occur due to hold-time cracking. In this study, laser peening technology was developed to improve fatigue properties of Ni-base superalloy Alloy 706, and the effects on the material properties were examined. Laser peening is a novel process to induce compressive residual stress on material surface by irradiating focused high-power laser pulses. Several durability tests, such as thermal aging treatment test and stress aging test, were performed under thermal power plant operation conditions, and the effectiveness of laser peening treatment was confirmed.
AB - Some cracks were found at the first stage discs of gas turbine rotors made of Ni-base superalloy. There were inter-granular cracking and observed to be highly stressed and damage sensitive locations with less potential for oxidation, which is thought to occur due to hold-time cracking. In this study, laser peening technology was developed to improve fatigue properties of Ni-base superalloy Alloy 706, and the effects on the material properties were examined. Laser peening is a novel process to induce compressive residual stress on material surface by irradiating focused high-power laser pulses. Several durability tests, such as thermal aging treatment test and stress aging test, were performed under thermal power plant operation conditions, and the effectiveness of laser peening treatment was confirmed.
KW - Alloy706
KW - Gas turbine
KW - Laser peening
KW - Thermal aging
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U2 - 10.1299/kikaib.79.249
DO - 10.1299/kikaib.79.249
M3 - Article
AN - SCOPUS:84876904045
VL - 79
SP - 249
EP - 252
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
SN - 0387-5016
IS - 799
ER -