SM45C재의 UNSM 처리에 의한 트라이볼러지 특성 변화
Variations in Tribology Factors of SM45C by UNSM Modification
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
The following results were obtained from a series of studies to accumulate data to reduce the coefficient of friction for press dies by performing tribological tests before and after the UNSM treatment of SM45C. The UNSM-treated material had a nano-size surface texture, high surface hardness, and large and deep compressive residual stress formation. Even when the load was doubled, the small amount of abrasion, small weight of the abrasion, and width and depth of the abrasion did not increase as much as those for untreated materials. When loads of 5 N, 7.5 N, and 10 N were applied to the untreated material of SM45C, the coefficient of friction was approximately 0.76–0.78. With the large specimen, a value of 0.72–0.78 was maintained at a load of 50 N despite the differences in the size of the wear specimen and working load. Tribological tests of large specimens of SM45C treated with UNSM under tribological conditions of 100 N and 50 N showed that the frictional coefficient and time constant stably converged between 0.7 and 0.8. The friction coefficients of the small specimens treated with UNSM showed values between 0.78 and 0.75 under 5 N, 7.5 N, and 10 N. The friction coefficients of the SM45C treated with UNSM were comparable to each other.
Abstract
The following results were obtained from a series of studies to accumulate data to reduce the coefficient of friction for press dies by performing tribological tests before and after the UNSM treatment of SM45C. The UNSM-treated material had a nano-size surface texture, high surface hardness, and large and deep compressive residual stress formation. Even when the load was doubled, the small amount of abrasion, small weight of the abrasion, and width and depth of the abrasion did not increase as much as those for untreated materials. When loads of 5 N, 7.5 N, and 10 N were applied to the untreated material of SM45C, the coefficient of friction was approximately 0.76–0.78. With the large specimen, a value of 0.72–0.78 was maintained at a load of 50 N despite the differences in the size of the wear specimen and working load. Tribological tests of large specimens of SM45C treated with UNSM under tribological conditions of 100 N and 50 N showed that the frictional coefficient and time constant stably converged between 0.7 and 0.8. The friction coefficients of the small specimens treated with UNSM showed values between 0.78 and 0.75 under 5 N, 7.5 N, and 10 N. The friction coefficients of the SM45C treated with UNSM were comparable to each other.
참고문헌 (13)
- Amanov, A., "Micro-dimpled Surface by Ultrasonic Nanocrystal Surface Modification and its Tribological Effects", Wear, pp.286~287 (2012)
- Amanov, A., "The Influence of DLC Coating on the Mechanical and Frictional Properties of Unpeened and Peened Cu-based Bimetal under Dry Sliding Conditions", Materials Chemistry and Physics, 143, pp.814~824 (2014)
- Chun, M. S., "Experimental Investigation on the Impact Behavior of Membrane Type LNG Carrier Insulation System", Journal of Loss Prevention in the Process Industries, 22(6), pp.901~907 (2009)
- Gim, J. S., "Introduction to PVD", PACVD Coating, 2007, pp.24(5), 7~13
- 전용준, "마모특성 및 유한요소해석을 이용한 프레스금형 손상 간접예측", 소성∙가공, 23(1), pp.29~34 (2014), 한국소성∙가공학회
- Kim, B. C., "Pressure Resistance of the Corrugated Stainless Steel Membranes of LNG Carriers", Ocean Engineering, 38, pp.592~608 (2011)
- Kim, H. S., "A Comparative Evaluation of Fatigue and Fracture Characteristics of Structural Components of Liquefied Natural Gas Carrier Insulation System", Journal of Pressure Vessel Technology, 135(2), pp.021405~ (2013)
- Kim, M. H., "Fatigue Strength Assessment of MARK-III Type LNG Cargo Containment System", Ocean Engineering, 37, pp.1243~1252 (2010)
- 이승철, "UNSM 기술을 이용한 초경의 기계적 특성변화", 한국트라이볼로지학회지, 31(4), pp.157~162 (2015), 한국트라이볼로지학회[DOI]
- Pyun, Y. S., "Fatigue Characteristics of SAE52100 Steel via Ultrasonic Nanocrystal Surface Modification Technology", Journal of Nanoscience and Nanotechnology, 12, pp.6089~6095 (2012)
- 서창민, "수소취화된 인코넬 718의 VHCF(Very High Cycle Fatigue) 피로특성에 관한 연구", 대한기계학회논문집 A, 40(7), pp.637~646 (2016), 대한기계학회
- Suh, C. M., "Fatigue and Mechanical Characteristics of Nanostructured Tool Steel by Ultrasonic Cold Forging Technology", Materials Science and Engineering: A, 443(1-2), pp.101~106 (2007)
- Yu, Y. H., "Cryogenic Reliability of the Sandwich Insulation Board for LNG Ship", Composite Structures, 95, pp.547~556 (2013)