Residual stress improvement of nickel base superalloy alloy 706 by laser peening

Itaru Chida, Rie Sumiya, Yomei Yoshioka, Daizo Saito, Tetsu Sawa, Daisuke Kobayashi, Akihiro Ito, Masamichi Miyabe, Yukio Kagiya

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)249-252
Number of pages4
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume79
Issue number799
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Alloy706
  • Gas turbine
  • Laser peening
  • Thermal aging

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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