질화포텐셜 제어 가스질화로 개발(III) : SCR420H 에널러스기어에 대한 제어질화 적용 및 내구성 평가 (Development of Controlled Gas Nitriding Furnace(III) : Application of Controlled Gas Nitriding Process and Evaluation of Durability for SCR420H Annulus gear)

서지정보

· 발행기관 : 한국열처리공학회
· 수록지 정보 : 열처리공학회지 / 36권 / 3호 / 161 ~ 173페이지
· 저자명 : 이원범, 정민재, 권민상, 김태환, 문철우

초록

This study investigated the effects of KN and process time on the formation of a compound layer at a nitriding temperature of 540oC for SCR420H material. As a result of controlled nitriding from 3 h to 20 h at KN 1.2 atm-1/2, compound layers were formed up to about 10 m, and an effective hardening depth of about 460 μm was obtained. Initially, an ε+γ′ complex phase was formed, and the phase fraction changed over time, and finally, the fraction of ε phase decreased to less than 1%. With higher KN, the compound thickness increased, a pore layer was formed on the surface, and the surface hardness decreased. By applying the controlled nitriding process, it was possible to produce annulus gears with a compound thickness of 12.8 m and an ε phase of 5% or less. The annulus gears made through controlled nitriding were mounted on a 6-speed transmission and tested for durability. As a result, the durability test of 250,000 km was satisfied, and the transmission efficiency was also confirmed to be expected.

영어초록

This study investigated the effects of KN and process time on the formation of a compound layer at a nitriding temperature of 540oC for SCR420H material. As a result of controlled nitriding from 3 h to 20 h at KN 1.2 atm-1/2, compound layers were formed up to about 10 m, and an effective hardening depth of about 460 μm was obtained. Initially, an ε+γ′ complex phase was formed, and the phase fraction changed over time, and finally, the fraction of ε phase decreased to less than 1%. With higher KN, the compound thickness increased, a pore layer was formed on the surface, and the surface hardness decreased. By applying the controlled nitriding process, it was possible to produce annulus gears with a compound thickness of 12.8 m and an ε phase of 5% or less. The annulus gears made through controlled nitriding were mounted on a 6-speed transmission and tested for durability. As a result, the durability test of 250,000 km was satisfied, and the transmission efficiency was also confirmed to be expected.

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