Shot peening method with which high compressive residual stress is obtained
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United States of America Patent
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Sep 13, 2016
Grant Date -
Apr 21, 2016
app pub date -
Apr 28, 2014
filing date -
Apr 30, 2013
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Abstract
A shot peening process involves the steps of providing a steel member having a surface with a Vickers hardness of 920 HV or more and projecting a shot against the steel member, the shot having a Vickers hardness of 1000 HV or more and a density of 5.5 Mg/m3 or more. The shot satisfies the relationship HVshot≧0.4×HVsteel+620, where HVshot is the Vickers hardness (HV) of the shot, and HVsteel is the Vickers hardness (HV) of the surface of the steel member. The resulting steel member has an unprecedentedly high compressive residual stress of 2,200 MPa or more.
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