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미끄럼 속도변화에 따른 철강재료의 미끄럼 마모거동 (중마모 거동에 미치는 연마모 도입시험의 영향)
이한영 한국트라이볼로지학회 2020 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.36 No.3
In this study, the effect of the pre-mild wear mode test condition on the subsequent severe wear behavior of carbon steel has been investigated when the wear mode is varied according to the sliding speed change during sliding contact. Two sliding speeds of 0.3 m/s and 3 m/s for the mild wear mode test have been chosen and a sliding speed of 1 m/s for the severe wear mode test. A mild wear mode test at two different sliding speeds has been carried out during the severe wear mode test and total sliding distance of the mild wear mode test has been changed at this time. As a result, it could be found that the wear rate of carbon steel under the severe wear mode test after performing a pre-mild wear mode test is significantly reduced, compared with that before performing. However, its wear rate was slightly higher than that under the mild wear mode test. Oxides produced during the pre-mild wear mode test have been found to play a significant role in reducing the wear rate under the subsequent severe wear mode test. In particular, it was found that the effect of a pre-mild wear mode test performed at the sliding speed of 3 m/s has more rapid and the reduction in the wear rate was greater than thst at the sliding speed of 0.3 m/s.
이종 상대재 경도에 따른 철강재료의 미끄럼 마모 특성 해석
이한영(Han-Young Lee) 한국트라이볼로지학회 2016 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.32 No.6
This study examines the wear behavior of mild steel pins mated against alloyed tool steel discs in a pin-on-disc type sliding test machine and provides specific clarification regarding the effects of disc hardness on the wear behavior of a mating mild steel pin. The analysis confirms these effects through the observation of differences in the wear rates of the mild steel pins at low sliding speed ranges. These differences occur even though the hardness of the mating disc does not affect the wear characteristic curve patterns for the sliding speeds, regardless of the wear regime. In the running-in wear regime, increasing the hardness of the mating disc results in a decrease in the wear rates of the mild steel pins at low sliding speed ranges. However, in the steadystate wear region, the wear rate of a pin mated against the 42DISC is greater than the wear rate of a pin mated against the 30DISC, which has a lower hardness value. This means that the tribochemical reactivity of the mating disc, which is based on hardness value, influences the wear behavior of mild steel at low sliding speed ranges. In particular, oxides with higher oxygen contents, such as Fe₂O₃ oxides, form predominantly on the worn surface of the 42DISC. On the contrary, the wear behavior of mild steel pins at high sliding speed ranges is nearly unaffected by the hardness of the mating disc.
Han‑Young Lee 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.12
This study investigates the effect of a change in the sliding speed on the wear behavior of mild steel and, in particular, theinfluence of the original speed on the wear behavior at subsequent speeds, in order to utilize it for the tribosystems design. The sliding wear tests were conducted by using a combination of changing conditions between two of three different slidingspeeds in a pin-on-disc type wear testing machine: two sliding speeds with mild wear behavior and a sliding speed withsevere wear behavior. It was obvious that the wear behavior after the speed change was highly dependent on the formationof oxides on the worn surface at each speed. When the speed changed between two speeds at which a mild wear behavior isexhibited, there was no significant difference in the sliding wear behavior before and after the speed change. When the speedchanged from 0.3 and 3 m/s with a mild wear behavior to 1 m/s with a severe wear behavior, there was no significant increasein the wear rate. In contrast, the wear rate rapidly decreased at a subsequent speed change to 0.3 and 3 m/s. The time requireduntil the steady-state wear condition was attained at the sliding speed of 0.3 m/s was significantly longer than that at 3 m/s.
Tekkouk Nazih,Arbaoui Mohamed,Abdi Saîd,Rezzoug Amine 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.10
Aluminium alloys are gradually replacing grey cast iron in the automotive industry thanks to its low density. The purpose of this study is to evaluate tribological properties of 2024A anodized aluminium alloy under severe wear conditions. For this aim we are investigating the effect of the sliding speed and the anodic layer in order to improve the wear resistance and friction properties of 2024A aluminium alloy and this by using the latter with the hard metal chrome steel 100C6 in dry punctual contact. So we shall evaluate hardness, wear rate and friction properties after and before the anodizing process. The results have shown that the sliding speed affects a transition from severe wear to mild wear when u = 0.3 m/s for the alloy covered by hard anodic layer, as well as it was a significant decrease in wear rate.
상대재 내식성이 철강재료의 미끄럼마모 특성에 미치는 영향
이한영(Han-Young Lee) 한국트라이볼로지학회 2019 한국윤활학회지(윤활학회지) Vol.35 No.2
This study investigates the effects of corrosion resistance characteristics of opponent materials in relative motion on the sliding wear behavior of mild carbon steel. Pin specimens made of mild carbon steel are tested at several sliding speeds against mating discs made of two types of alloyed steels, such as type D2 tool steel (STD11) and type 420 stainless steel (STS420J2), with different corrosion resistance characteristics in a pin-ondisc type sliding wear test machine. The results clearly show that the sliding wear behavior of mild carbon steel is influenced by the corrosion resistance characteristics of the mating disc materials at low sliding speeds. However, the sliding wear behavior at high sliding speeds is irrelevant to the characteristics because of the rising temperature. During the steady state wear period, the sliding wear rate of mild carbon steel against the type 420 stainless steel at a sliding speed of 0.5 m/s increases considerably unlike against the type D2 tool steel. This may be because the better corrosion resistance characteristics achieve a worse tribochemical reactivity. However, during the running-in wear period at low sliding speeds, the wear behavior of mild carbon steel is influenced by the microstructure after heat treatment of the mating disc materials rather than by their corrosion resistance characteristics.
오스템퍼링 處理된 球狀黑鉛鑄鐵의 乾燥磨滅 特性에 관한 硏究
강명순,전태옥,김형자,박흥식 대한기계학회 1988 대한기계학회논문집 Vol.12 No.3
This paper is studied to know wear mechanism in variation of austempering temperature and holding time of austempered ductile cast iron against mating material SM45C hardened by heat treatment. The wear tests were carried out by rubbing the annular surface of two test pieces in dry sliding friction. The wear mechanism was investigated by scanning electron microscopy and the retained austenite volume fraction was investigated by X-ray diffractometer. The experimental results show that the wear characteristics depend largely on the oxidation of the testing materials which is influenced by the sliding velocity and distance. The retained austenite has a negative effect during frictional contact because it has increased severe wear by softened surface layer. It is shown experimentally that hard metals have lower frictional resistance and hence the resistance to adhesion is increased due to stronger interatomic linking bonds and increase in the surface energy. 본 연구에서는 오스템퍼링 처리된 구상흑연주철의 오스템퍼링 처리온도와 유 지시간을 변화시킨 후 대기중의 건조미끄름마찰실험을 하여 내마멸특성을 검토하는 것 을 목적으로 하였다.
Cr₂O₃와 ZrO₂ 플라즈마 용사한 코팅재의 마모 특성
김성익(Sung-Ig Kim),김희곤(Hee-Gon Kim),이봉길(Bong-Gil Lee),김귀식(Gui-Shik Kim) 한국트라이볼로지학회 2006 한국윤활학회지(윤활학회지) Vol.22 No.6
This paper reports the wear characteristics of two types of coating materials, which are Cr₂O₃ and ZrO₂, by coated plasma thermal spray method. The wear test was carried out under air, grease, and bearing fluid conditions. The wear testing machine of a pin-on disk type were used to measure friction forces, friction coefficients and the weight losses of the coating specimens on the various sliding velocity and loading condition. The wear surface of specimens were observed by scanning electron microscope (SEM) photographs.