본 논문에서는 고속도 공구강중 특히 많이 사용하고 있는 Mo계 SKH51에 대하여 내구성 향상과 열처리에 의한 공구의 변형을 최소화하기 위한 최적의 tempering 온도 범위와 횟수를 조사하였으며, 전 처리된 SKH51에 대하여 Arc Ion Plation을 통한 TiN코팅을 하였으며 증착층의 성장과 물성에 크게 영향을 주는 N₂가스압력 의 증가, bias power supply감소, arc power supply 증가를 증착변수로 하여 TiN 증착층의 미세구조 변화 및 기계적 성질에 미치는 영향에 대해여 조사한 결과는 다음과 같다. 고속도강 SKH51의 가장 효과적인 tempering 공정은 1차 tempering은 560℃에서 시행하여 높은 경도값의 유지와 retained austenite의 많은 분해를 가져온 후 2차 tempering 부터는 560℃보다 낮은 520℃에서 행하여 높은 경도값의 유지와 결정립의 성장을 방지하며 retained austenite 분해에 따른 조직의 안정화를 가져오는 것이 적절한 tempering 공정이라고 판단된다. TiN Arc Ion Plating 증착시 N₂가스압력의 증가나 Arc power supply가 증가 보다 Bias power supply가 감소함에 따라 TiN 증착층은 치밀도가 아주 나빠지고 코팅층내의 closed pore가 존재하며 delamination이 일어나고 있다. 또한 미소 경도값, 증착두께도 큰 폭으로 감소하였다.
본 논문에서는 고속도 공구강중 특히 많이 사용하고 있는 Mo계 SKH51에 대하여 내구성 향상과 열처리에 의한 공구의 변형을 최소화하기 위한 최적의 tempering 온도 범위와 횟수를 조사하였으며, 전 처리된 SKH51에 대하여 Arc Ion Plation을 통한 TiN코팅을 하였으며 증착층의 성장과 물성에 크게 영향을 주는 N₂가스압력 의 증가, bias power supply감소, arc power supply 증가를 증착변수로 하여 TiN 증착층의 미세구조 변화 및 기계적 성질에 미치는 영향에 대해여 조사한 결과는 다음과 같다. 고속도강 SKH51의 가장 효과적인 tempering 공정은 1차 tempering은 560℃에서 시행하여 높은 경도값의 유지와 retained austenite의 많은 분해를 가져온 후 2차 tempering 부터는 560℃보다 낮은 520℃에서 행하여 높은 경도값의 유지와 결정립의 성장을 방지하며 retained austenite 분해에 따른 조직의 안정화를 가져오는 것이 적절한 tempering 공정이라고 판단된다. TiN Arc Ion Plating 증착시 N₂가스압력의 증가나 Arc power supply가 증가 보다 Bias power supply가 감소함에 따라 TiN 증착층은 치밀도가 아주 나빠지고 코팅층내의 closed pore가 존재하며 delamination이 일어나고 있다. 또한 미소 경도값, 증착두께도 큰 폭으로 감소하였다.
Recently, much emphasis places on coating technologies of ceramic materials, such as TiN on the high speed steel tools in order to improve machinability and lifes of steel tools. There has been, however, some difficulties that coating temperature must be limited within ∼500℃ because problems of soft...
Recently, much emphasis places on coating technologies of ceramic materials, such as TiN on the high speed steel tools in order to improve machinability and lifes of steel tools. There has been, however, some difficulties that coating temperature must be limited within ∼500℃ because problems of softening and phase trans formation of the steel arise at high temperature. Plasma assisted physical vapor deposition are considered to be most suitable process for TiN coating on high speed steel tools. TiN on steel substrate will be investigated with respect to the effects of deposition variables on the microstructure and composition of TiN, and mechanical properties. About effect that inspected tempering temperature dimension and number of times of most suitable to minimize transformation of tool by durability improvement and heat treatment about SKH51 that high speed steel is using much between specially in this treatise, and did TiN coating through arc ion plation about preprocessed SKH51 and do increase of N₂gas pressure, bias power supply decrease, arc power supply increase that influence deposition characteristic of TiN layers were investigated by various analysis methods. 1) the most effective tempering process of high-speed steel SKH51 after the first tempering brings interested person of tall hardness value and much disintegration of retained austenite enforcing in 560℃ the second tempering holding in lower 520℃ than 560℃ with interested person of tall hardness value growth of crystal grain prevent and it is judged that is proper tempering process that bring formation's stabilization by retained austenite disintegration. 2) The deposition characteristic of TiN layers section according to that increase of TiN arc ion plating N₂gas pressure can know that is some rough coarse. Also, increased to deposition characteristic although Micro hardness value became low. 3) Bias power supply TiN according to decrease density very grow worse and deposition characteristic closed pore exists and delamination is getting up. Also, decreased by width to Micro hardness value, deposition thickness. 4) Decreased to deposition according as Arc power supply increases but Micro hardness increased. 5) Increasing compositions of EDS experiment result stand condition, N₂gas pressure showed same spectrum but appeared by spectrum that compositions that increases bias power supply decrease and arc power supply differs. 6) Roughness could know that Increase continuously according as deposition increases in case evaporate by Arc ion plating method.
Recently, much emphasis places on coating technologies of ceramic materials, such as TiN on the high speed steel tools in order to improve machinability and lifes of steel tools. There has been, however, some difficulties that coating temperature must be limited within ∼500℃ because problems of softening and phase trans formation of the steel arise at high temperature. Plasma assisted physical vapor deposition are considered to be most suitable process for TiN coating on high speed steel tools. TiN on steel substrate will be investigated with respect to the effects of deposition variables on the microstructure and composition of TiN, and mechanical properties. About effect that inspected tempering temperature dimension and number of times of most suitable to minimize transformation of tool by durability improvement and heat treatment about SKH51 that high speed steel is using much between specially in this treatise, and did TiN coating through arc ion plation about preprocessed SKH51 and do increase of N₂gas pressure, bias power supply decrease, arc power supply increase that influence deposition characteristic of TiN layers were investigated by various analysis methods. 1) the most effective tempering process of high-speed steel SKH51 after the first tempering brings interested person of tall hardness value and much disintegration of retained austenite enforcing in 560℃ the second tempering holding in lower 520℃ than 560℃ with interested person of tall hardness value growth of crystal grain prevent and it is judged that is proper tempering process that bring formation's stabilization by retained austenite disintegration. 2) The deposition characteristic of TiN layers section according to that increase of TiN arc ion plating N₂gas pressure can know that is some rough coarse. Also, increased to deposition characteristic although Micro hardness value became low. 3) Bias power supply TiN according to decrease density very grow worse and deposition characteristic closed pore exists and delamination is getting up. Also, decreased by width to Micro hardness value, deposition thickness. 4) Decreased to deposition according as Arc power supply increases but Micro hardness increased. 5) Increasing compositions of EDS experiment result stand condition, N₂gas pressure showed same spectrum but appeared by spectrum that compositions that increases bias power supply decrease and arc power supply differs. 6) Roughness could know that Increase continuously according as deposition increases in case evaporate by Arc ion plating method.
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#Arc Ion Plating TiN 증착 공정변수
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