{"title":"Influence of Composition and Austempering Temperature on Machinability of Austempered Ductile Iron","authors":"Jagmohan Datt, Uma Batra","volume":74,"journal":"International Journal of Materials and Metallurgical Engineering","pagesStart":132,"pagesEnd":138,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/9996961","abstract":"
Present investigations involve a systematic study on the machinability of austempered ductile irons (ADI) developed from four commercially viable ductile irons alloyed with different contents of 0, 0.1, 0.3 and 0.6 wt.% of Ni. The influence of Ni content, amount of retained austenite and hardness of ADI on machining behavior has been conducted systematically. Austempering heat treatment was carried out for 120 minutes at four temperatures- 270o<\/span>C, 320o<\/span>C, 370o<\/span>C or 420o<\/span>C, after austenitization at 900oC for 120 min. Milling tests were performed and machinability index, cutting forces and surface roughness measurements were used to evaluate the machinability. Higher cutting forces, lower machinability index and the poorer surface roughness of the samples austempered at lower temperatures indicated that austempering at higher temperatures resulted in better machinability. The machinability of samples austempered at 420oC, which contained higher fractions of retained austenite, was superior to that of samples austempered at lower temperatures, indicating that hardness is an important factor in assessing machinability in addition to high carbon austenite content. The ADI with 0.6% Ni, austempered at 420°C for 120 minutes, demonstrated best machinability.<\/p>\r\n","references":"[1]\tM. N. Ahmadabadi, H. M. Ghasemi, and M. Osia, \"Effects of Successive Austempering on Tribological Behavior of Ductile Cast Iron,\u201d Wear, 1999, vol. 231, pp. 293\u2013300.\r\n[2]\tK. L. Hayrynen, D. J. Moore, and K. B. Rundman, \"Tensile and Fatigue Properties of Relatively Pure ADI,\u201d Trans. AFS, 1992, vol. 100, pp. 93\u2013104.\r\n[3]\tT. N. Rouns, K. B. Rundman, and D. J. Moore, \"On the Structure and Mechanical Properties of ADI,\u201d Trans. AFS, 1984, vol. 92, pp. 815\u201340.\r\n[4]\tT. S. Shih, C. S. Chang, and L. Z. 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