To provide a manufacturing method that can form a firmly hardened layer by the surface modification of a base material even for a structural member with a curved surface shape.
The manufacturing method includes: a laser irradiation step of irradiating a predetermined range of a substrate 53 formed of the base material with a laser beam L to heat the range to a temperature between 800°C or more where austenite reverse transformation is completed and less than a melting point of the substrate; and an aging heat treatment step of performing aging heat treatment to the substrate 53 that is irradiated with the laser beam L in the laser irradiation step to form the hardened layer 54 that is developed by precipitation hardening of the base material, in the predetermined range.
TSUBOTA SHUHO
KURIMURA TAKAYUKI
OYAMA KOJI
MIYAJIMA KEIICHIRO
| JP2004027261A | 2004-01-29 |
| US20020074066A1 | 2002-06-20 |
Masatake Shiga
Tadashi Takahashi
Tetsuo Yamazaki
Yasushi Matsunuma
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