질화처리가 금형펀치(SKH51)의 마모 특성에 미치는 영향 = The Effect on Characteristics of Wear Resistance for Mold Punch(SKH51) after Nitriding

다국어 초록 (Multilingual Abstract)

Recently, as the component industry has grown up with the high technology, metallic pattern is needed to have special properties such as precise processing, heat resistance, wear resistance, fatigue resistance and mass product. For these reason, high speed steels with good physical and mechanical properties is favored in the making of the metallic pattern. This study is focused on examining the micro-structure of nitrided case and relationship variation of hardening and wear behavior generated by vacuum heat treatment to grasp the properties of high speed steel for metallic pattern. Also, to understand the effect of ion nitriding for wear resistance of high speed steels the experiment to examine how much microstructure of nitrided layer and hardness variation affect on the wear behavior was conducted according to the ion nitrided treatment and behavior of compound layer and precipitation layer constituting nitrided layer. The results of experiment are as follows: The optimal austenitizing temperature reached at 1250℃ under the condition of the hardness value and surface of roughness in 1,170 ℃ and absorption energy showed 1,170℃ in the case of 1,100℃. Ion nitrided specimen, under these experimental condition, shows the existence of the area of two phases with matrix and carbides and also shows the value of W, Mo, Cr and V components higher in these area. The ruling wear mechanism turned out to be adhesion wear before ion nitriding specimen to be tempered repeatedly twice after quenching and sub-zero treatment but it is abrasive wear and the wear resistance is more enhanced after that process.

목차 (Table of Contents)

• Ⅰ. 서 론
• Ⅱ. 실험방법
• Ⅲ. 실험결과 및 고찰
• Ⅳ. 결 론