Abstract Gears play an important role in power transmission in aerospace, petroleum machinery, metallurgical and chemical industries. With the harsh requirements of the application environment and use conditions, the requirements for their quality reliability and durability are also increasing. The detection and analysis of surface integrity is more important and urgent. Based on the concept and connotation of surface integrity, this paper focuses on the latest non-destructive testing technology at home and abroad, and evaluates the important role of residual stress in life analysis and residual strength evaluation. Keywords gears; surface integrity; nondestructive testing; residual stress

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