초내열합금 오버레이부의 연삭마모특성 연구

A Study on the Abrasive Wear Properties of the Super Alloy Overlay Layers

The Plasma Transferred Arc (PTA) overlay welding method is lately introduced as one of the most useful surface overlay method of the engine component. In this paper, the overlay welding on the SNCrW heat resisting alloy was conducted by the PTA overlay welding process using the super alloy powder. The characteristics of the overlay layers were investigated through the metallurgical and abrasive test. Experimental results showed that the overlay on the SNCrW heat resisting alloy surface was successfully made without hot cracking. The friction wear characteristics of the Co-base Stellite 6 overlayer was most superior. However the abrasive wear characteristics was most inferior in the Co-base Stellite 6 overlayer.