Shot peening treatment for cavitation erosion resistance
AssigneeHitachi, Ltd.
InventorsLili ZHENG, Wei YUAN
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Abstract
In some examples, a material may be subject to shot peening of a relatively long duration to improve cavitation erosion resistance of the material. For example, the material surface may be shot peened to cause grain reduction and an increase in hardness to a depth of 60 μm or more, while the surface remains relatively smooth. As one example, the method may include treating a surface of austenitic stainless steel by impacting the surface with shot media for a treatment duration of 15 to 40 minutes at a shot peening intensity corresponding to an Almen strip type A intensity of 5A to 10A.
Claims20
A method of treating a surface of austenitic stainless steel to increase resistance to cavitation erosion, the method comprising impacting the surface with shot media for a shot peening duration of 15 to 40 minutes at a shot peening intensity corresponding to an Almen strip type A intensity of 5A to 10A.
A method comprising shot peening a surface of a material for a shot peening duration of 15 to 40 minutes at a shot peening intensity corresponding to an Almen strip type A intensity of 5A to 10A, wherein:
- the material has an austenitic crystalline structure, and
- a shot media used during the shot peening has a hardness greater than the material when the material is in an annealed condition.
A method comprising:
- impacting a surface of a material having an austenitic crystalline structure with shot media for a duration ranging from 15 and 40 minutes at an Almen strip type A intensity ranging from 5A to 10A;
- and
- polishing the surface to remove 10 to 20 μm of the material.
Dependencies are inferred from the claim text.