| 摘要 |
PURPOSE:To enable desired surface hardening even in case of a low-C member by using a gaseous mixture of an inert gas with a nitriding gas and a carburizing gas as a working gas when a plasma jet flame or plasma arc is irradiated on a steel member. CONSTITUTION:A plasma jet flame or plasma arc is generated by using a gaseous mixture of an inert gas such as Ar or He with a nitriding gas such as nitrogen and a carburizing gas such as methane as a working gas, and the flame or arc is irradiated on a structural steel member to carry out surface hardening. By this method, N and C atoms penetrate rapidly into the surface of the member, so satisfactory surface hardness and desired high fatigue strength are obtd. even when the member has a low C content.
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