Surface Topography in Machining of AISI D2 Hardened Steel

Abstract:

Surface topography plays an important part in understanding the nature of machined surfaces. This study is focused on surface topography of AISI D2 hardened steel (58-62 HRC) under dry milling process. Roughness, surface morphology and defects analysis were investigated. This study achieved R_a in range of 0.18 to 0.30 µm which is acceptable in mould and die requirement. Moreover, surface roughness decreased as cutting speed increased. From the optical microscope observation shows that the milled surface is anisotropic in nature. The lay pattern is produced by the combination of tool movement during milling operation (cutting and feed speed directions). Meanwhile, the AFM images indicated that the milled surfaces are groovy constructed by low-amplitude topography (between peak and valley of the machined surface waves). Surface defects were found in this study were debris, groove and cavity, all of which affected the surface roughness value.

• Periodical: Applied Mechanics and Materials (Volume 315)
• Pages: 660-664
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.315.660
• Online since: April 2013
• Authors: N.A.H. Jasni, Mohd Amri Lajis
• Keywords: AISI D2 Hardened Steel, Hard Milling, Surface Roughness (SR), TiAlN/AlCrN Multilayer Coated Carbide

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