한국표면공학회지 (49권6호 587-594)
The Effect of Nitriding/DLC Coating on the High Cycle Fatigue Properties of Fe-3.0Ni-0.7Cr-1.4Mn-X Steel
Fe-3.0Ni-0.7Cr-1.4Mn-X강의 고주기피로특성에 미치는 질화/DLC코팅의 영향
장재철;김송희;
Jang, Jae Cheol;Kim, Song-Hee;
서울대학교 재료공학부;강원대학교 나노응용공학과;
School of Materials Science and Engineering, Seoul National University;Department of Nano Applied Engineering, Kangwon National University;
Various surface treatments and thin film coating processes on the surface of injection die steel have been developed to extend the life. Most of previous studies were mainly focused on investigating the wear and static bonding behavior of thin films. In this study complex surface treatments of DLC coating combined with ion nitriding were applied to increase fatigue life and wear resistance. Ion nitriding, DLC coating, and DLC coating following nitriding on the surface of Fe-3.0Ni-0.7Cr-1.4Mn-X steel were investigated to uncover the beneficial effect which is applicable to injection die. The effect of various surface treatments and coating conditions on high cycle fatigue resistance was studied. Surface morphology change during fatigue tests were observed with AFM. Fatigue life of the die steel increased by 10 to 1,000 times at the various level of stress amplitudes in the condition of DLC coating following the ion nitriding for 3 hrs comparing with the only DLC coated condition.
DLC coating;Nitriding;High cycle fatigue resistance;Fractographic study;
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