Improving the high temperature oxidation resistance of Ni-based superalloy GH202 induced by laser shock processing

作者: Jiangdong Cao , Junsong Zhang , Yinqun Hua , Ruifang Chen , Yunxia Ye

DOI: 10.1016/J.JMATPROTEC.2016.11.040

关键词:

摘要: Abstract Laser shock processing (LSP) is employed to improve the high temperature oxidation resistance of Ni-based superalloy GH202. Many crystal defects surface after treated were found by transmission electron microscope. The residual compressive stress (maximum −305 MPa) and micro-hardness 579 HV) specimens improved significantly. isothermal kinetics GH202 before LSP showed that weight gain all slowed relatively, it was more obviously at 900 °C. film LSP-treated mainly composed Cr 2 O 3 , TiO NiCr 4 a little Al . High density dislocations provided many channels 3+ diffusing GH202, which would facilitate formation denser protective compared untreated specimens. results improved, especially significantly

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