• Title/Summary/Keyword: wear test

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Wear Behavior of Plasma Transferred Arc Deposited Layers for Ni - and Co - base Alloy (Ni계 및 Co계 합금 PTA 오버레이용접층의 마모거동에 관한 연구)

  • 윤병현;이창희;김형준
    • Journal of Welding and Joining
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    • v.19 no.5
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    • pp.540-547
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    • 2001
  • This study has evaluated the wear behavior of PTA (Plasma Transferred Arc) Inconel 625 and Stellite 6 overlays on Nimonic 80A substrate. Nimonic 80A alloy was also included for comparison. In order to evaluate the wear performance, three-body abrasive wear test and pin-on-disk dry sliding wear test were performed. Microstructural development during the solidification of deposits is also discussed. Wear test results show that the wear rate of Stellite 6 deposit is lower than that of Inconel 625 deposit and Nimonic 80A. The sliding wear resistance of overlay deposits follows a similar trend to the abrasive wear resistance, but for Nimonic 80A. The main wear mechanisms were abrasive wear for Inconel 625 deposit, adhesive wear and delamination for Stellite 6 deposit in pin-on-disk dry sliding wear test and ploughing in three-body abrasive wear test. Cross sectional examinations of the worn surface of pin specimens after pin-on-disk dry sliding wear test implies that the plastic deformation near worn surface has occurred during the wear testing.

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A Study on Friction and Wear Characteristics of Sintered W/C-35%Ni Tappets for Diesel Engine Application (디젤엔진용 소결(W/C35%Ni) 태핏의 마멸거동에 관한 연구)

  • 류병진;오세일;박맹로;양승호
    • Tribology and Lubricants
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    • v.16 no.1
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    • pp.33-38
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    • 2000
  • Abstract- In this paper tribological characteristics of solid and liquid phase sintered W/C-35%Ni tappets were investigated. Three test methods were performed to investigate the wear and surface damage mechanism of sintered tappets. First, block-on-ring wear test was performed to investigate the wear characteristics under pure sliding condition. Second, simplified cam and tappet tests (called component wear test hereafter) were carried out to simulate the real contact history of cam and tappet. Also, after the test, contact surfaces were analyzed with scanning electron microscope to study the wear mechanism. As a final screening, engine dynamo tests were performed. Results showed that in the block on ring sliding wear test, solid phase sintered specimens showed superior wear resistance to liquid phase sintered specimens. The component wear tests and engine dynamo tests also showed the same results. Therefore, in these tests, solid phase sintered tappet material revealed superior wear resistant properties to liquid phase sintered one.

Wear Life Prediction of CrN Coating Layer on the Press Tool for Stamping the Ultra High Strength Steel Sheet (초고강도강판 프레스성형용 금형의 CrN 코팅층 마모수명 예측)

  • Lee, J.H.;Bae, S.B.;Youn, K.T.;Heo, J.Y.;Kim, S.H.;Park, C.D.
    • Transactions of Materials Processing
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    • v.26 no.3
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    • pp.137-143
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    • 2017
  • In this study, a wear test method was proposed to predict the wear life of the CrN layer coated on the surface of the press tools for manufacturing the auto-parts with ultra high strength steel (UHSS) with a tensile strength of 1.5 GPa. The pin-on-disc type wear test was carried out to confirm the feasibility and the reproducibility of the wear amount according to the test conditions such as the normal force, the sliding velocity, and the sliding speed. The test conditions were obtained from the finite element stamping analysis and the wear simulation. With the wear amount from the wear test, a prediction model of the wear depth in the CrN coating layer was proposed according to the test conditions with the design of experiments such as Taguchi method and the response surface method. The derived prediction model was then compared to the result of the Archard wear model, fully describing that the proposed model can effectively predict the wear life of the press tools for the auto-parts with UHSS.

A Study on Tribological Characteristics of Powder Sintered Fe-base Alloy (SMF9060) (Fe계 합금 분말 소결품(SMF9060)의 마모 특성 연구)

  • Kim, Sang Youn;Kim, Dae Wook;Park, Yeong Min;Shin, Dong Chul;Kim, Tae Gyu
    • Journal of the Korean Society for Heat Treatment
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    • v.27 no.2
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    • pp.65-71
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    • 2014
  • SMF9060 material is a Fe-based powder sintered alloy that is used for several automobile components such as Synchronize Hub, oil pump and transmission. These components are required excellent wear resistance and durability. In this study, we have performed a dry wear test at the ambient air and Ar gas conditions in the room temperature, and a lubricant wear test at the room temperature and engine oil temperature of $100^{\circ}C$. The amount of wear volume and coefficient friction are measured by a Profilometer and a Ball on disk type wear tester. The wear volume in Ar gas condition was a little higher than that in the ambient air condition. However the wear volume in the lubricant wear condition was much lower than in the dry wear condition. XRD analysis of the debris in Ar gas condition showed that the oxide film was not formed.

Post-purchase Evaluation on the Maternity Wear on the Current Korean Market by Survey and Wear test

  • Park, Soon-Jee;Lee, Hee-Jung;Suh, Chu-Yeon
    • Journal of Fashion Business
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    • v.11 no.3
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    • pp.15-34
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    • 2007
  • This study was designed to collect a precise information concerning to the preference and evaluations after usage of pregnant Korean woman for the maternity wear bysurvey and wear tests. Through the survey, 212 respondents were asked to answer what type of maternity wear they prefer and what requirements for maternity wear design are important. According to the results of survey, the mostly preferred maternity wear items were pants and one-piece dress. Korean customers for maternity wear usually pay more for the one-piece dress than other items and they also usually put on medium price pants and low-price blouse. Concerning to the purchase criteria, it may be said that design and movability, fit factors are the buying decision criteria of great weight for Korean pregnant women. Special function most desired was thermal insulation, followed by buffer action, electromagnetic shield and quickly water-absorbent and dry property. Preferred maternity wear design details were flat collar, slightly fitted waist and empire style, gather skirt, rubber band waist. Wear test was performed for two kinds of blouse (BL) and one-piece dress (OP), and threekinds of pants (PT), which have different design details respectively. According to the wear test for ready-to-wear maternity garments, the garment which considers well the characteristics of Korean pregnant women body shape earned much higher score no matter of brands or prices. Generally, high-priced national brands received an excellent evaluation in design aspect, but not satisfied with comfort to move.

Effect of Deformation Properties at the Contact Surfaces on the Wear Rate (접촉면에서의 변형특성이 마멸속도에 미치는 영향)

  • 이영호;김인섭
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • pp.115-121
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    • 2001
  • The wear test has been performed to evaluate the wear mechanism of steam generator (SG) tube materials against ferritic stainless steel in water environment. The wear rates of SG tube materials depend on the change of mechanical properties between contact surfaces during wear test. From the subsurface hardness test, Inconel 690 is more work-hardened than Inconel 600 even though these materials have similar hardness values before the wear test. Main cause is due to the difference of stacking fault energy with the chromium content. In water environment, wear mechanism is closely related with the continuous formation and fracture of deformation layers at the contact surfaces.

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Morphological Anaylsis of Wear Debris for Lubricated Moving Machine Surfaces by Image Processing (화상처리에 의한 기계윤활 운동면의 마멸분 형태해석)

  • 박흥식;전태옥;서영백;김형자
    • Tribology and Lubricants
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    • v.12 no.3
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    • pp.72-78
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    • 1996
  • This paper was undertaken to analyze the morphology of wear debris generated from lubricated moving machine surfaces by image processing. The lubricati, ng wear test was performed under different experimental conditions using the wear test device made in our laboratory and wear test specimen of the pin on disk type wear rubbed in paraffme series base oil, by varying applied load, sliding distance. The four parameters (50% volumetric diameter, aspect, roundness and reflectivity) to describe the morphology have been developed and outlined in the paper. A system using such techniques promises to obviate the need for subjective, human interpretation of particle morphology in machine condition monitoring, thus to overcome many of the difficulties with current methods and to facilitate wider use of wear particle analysis in machine condition monitoring.

Wear and Friction Characteristics of SiC Reinforced Aluminium 6061 Alloy Composites (SiC 보강 A16061 복합재료의 마멸 및 마찰특성에 관한 연구)

  • 권재도;안정주
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.9
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    • pp.2122-2132
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    • 1995
  • There are some cases which require to grasp the abrasion resistance property in the fields of the high-technology to be required the high specific strength and modulus. In this study, wear test with the various test temperature and velocity were performed in the SiCw/A16061 composite and A16061 matrix using the wear test machine of the ring-on-disc type. As the results, the friction and wear properties by various test temperature and velocity were examined. The worn surface has observed by scanning electron microscope in order to examine the wear mechanism.

A Study on the Wear Resistance and Modification Condition for Laser Surface Modified Steel (레이저 표면개질강의 개질조건과 마멸저항에 관한 연구)

  • 옥철호
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.332-338
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    • 1999
  • Surface hardening of plain carbon steel (SM$%C) by Laser are usually much finer and stronger than those of the base metals. The present study was undertaken to investigate the wear resistance and a processing parameters such as, power density, pulse width, defocusing distance, and molten depth for surface modification of plain carbon steel. The wear test was carried out under experimental condition using the wear test device, and in which the annular surfaces of wear test specimens as well as mating specimen of alumina ceramics(Al2O3) was rubbed in dry sliding condition. It is shown that molten depth and width depend on defocusing distance. The wear loss on variation of sliding speed was much in lower speed range below 0.2m/sec and in higher speed range above 0.7m/sec, but wear loss was little in intermediate speed range. It depends on oxidation speed and wear speed.

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Laser hardening and Wear Characteristics of Surfaces hardening steel by YAG LASER (′YAG 레이저에 의한 표면경화강의 레이저 경화와 마멸특성)

  • 옥철호;서영백;조연상;배효준;박흥식;전태옥
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • pp.63-70
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    • 1999
  • Surface hardening of plain carbon steel (SM45C) by Laser are usually much finer and stronger than those of the base metals. The present study was under taken to investigate the wear resistance and a processing parameters such as, power density, pulse width, defocusing distance, and molten depth for surface modification of plain carbon steel. The wear test was carried out under experimental condition using the wear test device, and in which the annular surfaces of wear test specimens as well as mating specimen of alumina ceramics($Al_2O_3$) was rubbed in dry sliding condition. It is shown that molten depth and width depend on defocusing distance. The wear loss on variation of sliding speed was much in lower speed range below 0.2m/sec and in higher speed range above 0.7m/sec, but wear loss was little in intermediate speed range. It depends on oxidation speed and wear speed.

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