| 摘要 |
Provided is a method for performing shot peening (hereinafter abbreviated as "SP") on a treatment surface of a work piece which is a steel product that was subjected to heat hardening, the aforementioned method being such that it is possible to remarkably improve the durability (heat cycle resistance in particular) of the heat hardened surface of the aforementioned steel product. The aforementioned method for performing SP treatment on the work piece, which is the steel product subjected to heat hardening, includes a first SP treatment which removes a chemical compound layer (white layer) produced by heat hardening, as well as a second SP treatment which provides compressive residual stress to a first SP treated surface of the work piece subjected to the first SP treatment. By means of nondestructive inspection, an acceptance/rejection decision is made depending on whether or not the chemical compound layer is removed subsequent to the first SP treatment, and thereafter, the second SP treatment is performed only on an accepted article. |
