Surface Treatment Method for a Steel Workpiece Using High Speed Shot Peening

Author:  Yoshiro Yamada et. al
Source:  US Patent 5,816,088
Doc ID:  2023011
Year of Publication:  1998
Fatigue-resistance is significantly increased by performing shot peening using fine shots. A plurality of particles of hard metal having a diameter ranging from 20 to 100 micrometers are ejected onto a surface of a steel workpiece at an impinging speed greater than 80 m/second. The impinging speed is controlled so that the upper limit of temperature rising of the surface of the workpiece is maintained at a temperature more than 150° C. but less than the temperature at which recovery recrystallization and austentizing of steel occurs.

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