• 한국기계가공학회지
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• 제10권2호
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• pp.117-123
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• 2011

The purpose of this study is to show the friction and wear characteristics on the vapor deposited coating layers on the SCM415 steel. In this research, frictional wear characteristic of coating materials such as Ti-series, Cr-series & WC/C and TiAlN+WC/C multilayer coating was investigated under room temperature, normal air pressure and no lubricating condition. Therefore, this study carried out research on the friction coefficient, micro hardness(Hv), surface roughness and wear quantity on the vapor deposited coating layers on the SCM415 steel. As the wear experimental result, the excellence of TiAlN+WC/C multilayer coating has been proven by high micro-hardness, low friction coefficient and wear quantity.

• 한국기계가공학회지
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• 제18권9호
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• pp.58-63
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• 2019

In this research, we examine the change of dimensional accuracy in the cutting process while changing cutting conditions such as feed rate and spindle rotational speed with chromium molybdenum steel (SCM415) material and TiCN- and TiAlN-coated end mill tools. According to dimensional accuracy measurement, TiCN-coated tool displays the most accurate dimensional tolerance at ${\varnothing}20mm$ at feed rates of 200 mm/min and 250 mm/min at a spindle rotation speed of 4,000 rpm. The largest dimension of the coating tool was able to make the TiAlN-coated tool suitable when comparing the smallest dimension.

• 한국기계가공학회지
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• 제18권7호
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• pp.77-82
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• 2019

In this study, we study the change of surface roughness during cutting machining by changing the cutting conditions such as feed rate and spindle velocity with chromium molybdenum steel (SCM415) material and TiCN and TiAlN coated end mill tools. The surface roughness value of the test specimen for SCM415, was found to be 3,000 rpm in TiCN coated end mill and $0.634{\mu}m$ in surface roughness at a feed rate of 100 mm/min. In the TiAlN coated end mill, 300 mm/min, the surface roughness was the best at $0.699{\mu}m$. The overall average surface roughness of each coating tool was better than that of TiAlN.

• 대한기계학회논문집A
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• 제40권10호
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• pp.873-878
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• 2016

컨트롤 밸브용 SCM415강은 밸브케이스와 밸브의 지속적인 운동을 통해 마멸이 발생한다. 마멸은 밸브의 성능을 저하시키고, 사용 수명을 단축시킨다. 본 논문은 컨트롤 밸브용 모재 및 침탄 처리된 SCM415강에 대하여 마멸 특성을 평가하였다. 마멸 시험은 다양한 온도 및 하중에서 왕복동 마모시험기를 이용하여 수행되었으며, 마멸량, 비마멸율 및 마찰계수를 분석하였다. 마멸 메커니즘은 SEM을 통하여 분석하였다. 마멸량에 대한 하중과 온도의 교호작용은 MINITAB을 이용한 분산분석을 수행하였다.

• 한국재료학회지
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• 제3권5호
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• pp.538-545
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• 1993

초음파의 표면파의 전파특성을 이용하여 SCM440강의 고주파열처리의 정도에 따른 표면경화층의 깊이를 측정, 조사하였으며 침탄속도는 동일조직에서는 주파수에 관계없이 일정하였으나, 경화조직에서 경화되지 않은 조직에 비하여 표면파의 속도는 59m/s 늦었다. 강의 유효경화층깊이(d)와 표면파파장($\lambda_{R}$)의 d/$\lambda_{R}$의 관계로부터 경화층의 \ulcorner이를 비파괴적으로 평가, 측정할 수 있었으며 침탄경화시킨 경우에서도 동일한 결과를 얻었다.

• 한국기계가공학회지
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• 제8권4호
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• pp.122-128
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• 2009

The purpose of this study is to show the friction and wear characteristics on the vapor deposited coating layers on the SCM415 steel. In this research, frictional wear characteristic of coating materials such as CrN, AlCrN, WC/C was investigated under room temperature, normal air pressure and nothing lubricating condition. Therefore this study carried out research on the friction coefficient, micro hardness(Hv), roughness, EPMA on the vapor deposited coating layers on the SCM415 steel.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 1994년도 특별강연 및 춘계학술발표 개요집
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• pp.215-218
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• 1994

• Tribology and Lubricants
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• 제26권3호
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• pp.162-166
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• 2010

The purpose of this study is to show the friction and wear characteristics on the vapor deposited Tiseries coating layers on the SCM415 steel. In this research, frictional wear characteristic of coating materials such as TiN, TiCN, TiAlN was investigated under room temperature, normal air pressure and dry lubricating condition. Therefore this study carried out research on the friction coefficient, micro hardness(Hv), roughness, SEM on the vapor deposited coating layers on the SCM415 steel.

• 열처리공학회지
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• 제17권6호
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• pp.327-335
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• 2004

Effect of spherodization of cementite on static and dynamic deformation behaviors of SCM415 steels was investigated in this study. Dynamic torsional test was conducted using torsional Kolsky bar with the strain rate of $1.6{\times}10^3/s$. Three type of specimens were used with different spherodization degree of cementite. Dynamic test results were analyzed comparing with static tensile results and microstructural changes. The obtained results are as follows; 1) All the specimens of static and dynamic tests showed a ductile fracture mode of dimple. Specimens of the dynamic test showed adiabatic shear bands on the beneath of fracture surface. 2) In static tensile test, decreased tensile strength and increased uniform and non-uniform elongations appeared as spherodization degree of cementite increased. 3) In dynamic torsional test, decreased shear strength and increased uniform elongation appeared as spherodization degree of cementite increased. 4) Due to the largest uniform elongation, superior cold forgeability at high speed is expected on high spherodization degree of cementite.

• 한국재료학회지
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• 제8권8호
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• pp.707-713
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• 1998

현재 자동차용 소재 및 기계부품에 폭넓게 이용되는 SCM415강의 플라즈마 침탄 특성을 연구하기 위해 가스조성, 압력, 전류밀도, 온도 및 시간을 변수로 사용하였다. 가스조성의 경우 저합금강에서는 수소 가스 효과보다 메탄가스에 의해 주로 침탄특성이 좌우되며 메탄가스 100%일 때 시편 내의 모든 방향에서 경화층 분포가 일정하고, 최대의 유효경화깊이를 얻을 수 있었다. 가스압력이나 플라즈마 전압이 상승할 때 전류밀도가 상승하게 되는데, 이에 따라 최표면의 탄소농도가 증가되어 강의 유효경화깊이는 증대되었다. 침탄 온도일 경우 적어도 85$0^{\circ}C$이상되어야 유효경화깊이를 얻을 수 있었고, 온도가 상승할수록 유효경화깊이의 증가를 나타내어 침탄 효과가 우수하였다. 탄소의 확산 깊이는 침탄 시간의 제곱근에 비례하는 것으로 나타났다. 플라즈마 치탄한 강의 피로강도를 평가한 결과 열처리하지 않은 시편이나 재가열처리한 시편에 비해 높은 피로강도를 나타내었다.