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US 2016/0107292 A1Published application
Shot Peening Method with Which High Compressive Residual Stress is Obtained
AssigneeSanyo Special Steel Co., Ltd.
InventorToshiyuki Sawada
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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.
Claims9
A shot peening process comprising the steps of:
- providing a steel member having a surface with a Vickers hardness of 920 HV or more;
- and
- projecting a shot excluding cemented carbide 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, and the shot satisfying the following relationship:
- HVshot≧0.4×HVsteel+620
- wherein HVshot is the Vickers hardness (HV) of the shot, and HVsteel is the Vickers hardness (HV) of the surface of the steel member.
2 more elements
Dependencies are inferred from the claim text.