Abstract
The microstructures, machinability and surface characteristics of Al–7Si and Al–7Si–2.5Cu cast alloys were studied after various melt treatments like grain refinement and modification. Results indicate that combined grain refined and modified Al–7Si–2.5Cu cast alloys have microstructures consisting of uniformly distributed α-Al grains, eutectic Al–silicon and fine CuAl2 particles in the interdendritic region. These alloys exhibited better machinability and surface characteristics in the cast condition compared with the same alloy subjected to only grain refinement or modification. Performances of the turning inserts (Un-coated, PVD and Polished CVD diamond coated) were evaluated in machining Al–7Si and Al–7Si–2.5Cu cast alloys under dry environment using a lathe. The Polished CVD diamond coated insert outperformed the Un-coated or PVD-coated cutting inserts which suffered from sizeable edge buildup leading to higher cutting force and poor surface finish. The Polished CVD diamond coated insert shows a very small steady wear without flaking of the diamond film during cutting. This paper attempts to investigate the influence of grain refinement, modification and combined action of both on the microstrutural changes in the Al–7Si and Al–7Si–2.5Cu cast alloys and their machinability and surface finish when different turning inserts used.
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References
Mondolfo (1979) Aluminium: structures and properties. Butter-Worth, England, p 756
ASM Hand book, casting (1989) ASM international. Metal Park, Ohio, p 785
Kori SA, Murthy BS, Chakraborthy M (2000) Materials Sci Eng A283:94–104
Basavakumar KG, Mukunda PG, Chakraborty M (2006) Trans Indian Inst Met 59(3):400
Lasa L, Ibabe JMR (2002) Scripta Mater 46:477
Hafiz ME, Kobayashi T (1994) Scripta Metallurgica et Mater 30(4):475
Brechet Y et al (1991) Acta Metall and Mater 39(8):1781
Hintermann HE, Chattopadhaya AK (1993) Ann CIRP 42:769
ASM Hand book (1989) Selection and properties of non-ferrous materials, ASM International, Vol 2. Metal Park, Ohio, p 1223
Arumugam PU, Malse AP, Batzer SA (2006) Int J Surface Coating Tech 200:3399–3403
Konig W, Erinski D (1983) Annals of CIRP 32(2):535–540
Murali S (1997) Mater Sci Technol 3:336–342
Shen CH (1994) Trans NAMRI/SME XXII:201
Malshe AP, Park BS, Brown WD, Naseem HA (1999) Int J Diamond Relat Mater 8:1198
Grum J, Kisin M (2005) Machine Tools and Manufacture 1–13
Chamberlain B (1979) Machinability of aluminium alloys Metals Handbook, Vol. 2. Properties and Selection: Nonferrous Alloys and Pure Metals, 9th ed. p 187
Grum J, Kisin M (2003) Int J Machine Tools Manufacture 43(15):1535–1543
Lasa L, Ibabe JMR (2003) Mater Sci Eng A 363:193
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Basavakumar, K.G., Mukunda, P.G. & Chakraborty, M. Influence of melt treatments and turning inserts on cutting force and surface integrity in turning of Al–7Si and Al–7Si–2.5Cu cast alloys. J Mater Sci 42, 8714–8724 (2007). https://doi.org/10.1007/s10853-007-1754-z
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DOI: https://doi.org/10.1007/s10853-007-1754-z