Abstract
High temperature nitrogen plasma flow was generated by an arc-heated wind tunnel. The effect of the plasma flow on composition and a property of metal materials were investigated. In this paper, nitriding of carbon steel, which is one of techniques for surface hardening was undertaken by the plasma flow and a change of metal properties with or without shock-shock interaction was analyzed by a hardness meter. In addition, hardness of metal materials due to the pattern of shock-shock interaction was investigated.
