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오윤희(YunHee Oh),변상호(SangHo Byun),최인혁(InHyuk Choi) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
The characteristics and durability of annulus Gears for Planetary Gear in Automatic Transmission are compared by nitride compound layer thickness and pore rate. Samples are made with SCr420H steel which is widely used as Gear for Automobile and treated Phase-Control-Nitriding method which is known for little distortion and better durability. We made three different compound layers of heat-treated samples (about 2, 10, 17㎛), by differing nitriding-potential and diffusion time. All three samples are tested under dynamometer and compared their durability. From Microstructure analysis, it shows that porous layer increases as compound layer increases. X-ray diffraction analysis, the amount of ε-nitride was gradually increased from single phase of γ"-nitride at the initial stage as thickness of compound layer. The result of durability tests indicated that 10 ㎛ compound layer specimen has better durability.
무전해 니켈도금 처리된 강재 부품의 마모 특성에 관한 연구
노재훈(Jaehun Roh),변상호(Sangho Byun),최인혁(Inhyuk Choi) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Wear characteristics of Electroless Nickel Plating on carbon tool steel were investigated to find out the effect of base material hardness and phosphorus contents in nickel plating layer. The tests were conducted by ball on plate type reciprocal wear tester under the 90 N vertical load and the ball speed 25 mm/s. Three kinds of specimens were prepared with different type of heat treatment (austempered/annealed) and Ni-P contents in plating layer. Experimental results show that the higher hardness base material specimens have inferior wear resistance to lower hardness base material specimens. The contents of Ni-P ratio in plating layer is more dominant parameter than hardness of base materials.