Effect of Shot Peening on Microstructural Evolution of 500-7 Ductile Cast Iron
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Ductile cast iron is widely used for many automotive components due to its high wear resistance and fatigue resistance in addition to the low cost of fabrication. The improvement of wear resistance and fatigue properties is key to the life time extension and performance increase of the automobile parts. Surface nanocrystallization is a very efficient way of improving the performance of materials including the wear- and fatigue-resistance. Shot peening treatment, as one of the popular and economic surface modification methods, has been widely applied to various materials. In this study, ductile cast iron specimens were ultrasonic shot peening (USP) treated for 5 to 30 min using different ball size. The microstructures were then microscopically analyzed for determination of the microstructural evolution. After the USP treatment, the hardness of pearlite and ferrite increased, in which ball size is more effective than treatment time. With USP treatment, the graphite nodule count near the surface was decreased with grain refinement. The lager balls resulted in an increased deformation, whereas the smaller balls induced more homogenously refined grains in the deformation layer. In addition, formation of nanoparticles was formed in the surface layer upon USP.
Abstract
Ductile cast iron is widely used for many automotive components due to its high wear resistance and fatigue resistance in addition to the low cost of fabrication. The improvement of wear resistance and fatigue properties is key to the life time extension and performance increase of the automobile parts. Surface nanocrystallization is a very efficient way of improving the performance of materials including the wear- and fatigue-resistance. Shot peening treatment, as one of the popular and economic surface modification methods, has been widely applied to various materials. In this study, ductile cast iron specimens were ultrasonic shot peening (USP) treated for 5 to 30 min using different ball size. The microstructures were then microscopically analyzed for determination of the microstructural evolution. After the USP treatment, the hardness of pearlite and ferrite increased, in which ball size is more effective than treatment time. With USP treatment, the graphite nodule count near the surface was decreased with grain refinement. The lager balls resulted in an increased deformation, whereas the smaller balls induced more homogenously refined grains in the deformation layer. In addition, formation of nanoparticles was formed in the surface layer upon USP.
참고문헌 (20)
- Bang C W, "Atomically resolved cementite dissolution governed by the strain state in pearlite steel wires", Scr. Mater., 108, pp.151~155 (2015)[DOI]
- Berto F, "Fatigue strength of sharp Vnotched specimens made of ductile cast iron", Eng. Fail. Anal., 82, pp.308~314 (2017)[DOI]
- Fang F, "Deformation of cementite in cold drawn pearlitic steel wire", Mater. Sci. Eng., 608, pp.11~15 (2014)[DOI]
- Ganapathy T, "Experimental investigation of the residual stress and calculate average fatigue life and improved resistance to stress corrosion cracking on aluminum alloy 7075-T6 plates by using various shots through shot peening process", Int. J. Mod. Eng. Res., 5, pp.9~14 (2015)
- Yinsheng He, "Microstructural Characterization of SS304 upon Various Shot Peening Treatments", Applied Microscopy, 45(3), pp.155~169 (2015), 한국현미경학회
- Khameneh M J, "Evaluation of high-cycle bending fatigue and fracture behaviors in EN-GJS700-2 ductile cast iron of crankshafts", Eng. Fail. Anal., 85, pp.189~200 (2018)[DOI]
- Kumar H, "Modified shot peening process", Int. J. Eng. Sci. Emerg. Technol., 5, pp.12~19 (2013)
- Luo X, "Vibration damping using flexible graphite", Carbon, 38, pp.1499~1524 (2000)[DOI]
- Marsh K J, "Shot Peening: Techniques and Applications" (1993)
- Nam K, "Microstructural evolution of Super304H upon ultrasonic shot peening and subsequent annealing", J. Nanosci. Nanotechnol., 18, pp.6274~6277 (2018)[DOI]
- Ochi Y, "Effect of shot-peening treatment on high cycle fatigue property of ductile cast iron", Int. J. Fatigue, 23, pp.441~448 (2001)[DOI]
- Okabayasi K, "Wear resistance of spheroidal graphite cast iron: effect of the amount of ferrite in the matrix on wear resistance", Japan Foundarymen's Soc., 30, pp.866~873 (1958)
- Pan R, "Formation of nanocrystalline structure in pearlitic steels by dry sliding wear", Mater. Charact., 132, pp.397~404 (2017)[DOI]
- Radzikowska J M, "Metallography and microstructures of cast iron", Metallogr. Microstructur., 9, pp.565~587 (2004)
- Shukla P, "Laser shock peening and mechanical shot peening processes applicable for the surface treatment of technical grade ceramics: a review", Proc. MechE Part B: J. Eng. Manuf., 228, pp.639~652 (2013)
- Teshima T, "Local cementite cracking induced by heterogeneous plastic deformation in lamellar pearlite", Mater. Sci. Eng.: A, 679, pp.223~229 (2017)[DOI]
- Wang Y, "Microstructure evolution of cementite in cold drawn pearlitic steel wires", Trans. Mater. Heat Treat., 5, pp.022~ (2010)
- Watanabe Y, "Effect of ultrasonic shot peening on fatigue strength of high strength steel", 10th International Conference on Shot Peening (ICSP10), pp.305~310 (2002), Electronics Inc.
- William G, "Materials for Tribology" (1992), Elsevier
- 유대황, "Effect of Ultrasonic and Air Blast Shot Peening on the Microstructural Evolution and Mechanical Properties of SUS304", Journal of the Korean Physical Society, 54(3), pp.1161~1166 (2009), 한국물리학회