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Investigating the machinability of austempered ductile irons with dual matrix structures

  • İsmail Ovalıa and Ahmet Mavib
Published/Copyright: August 17, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 104 Issue 2

Abstract

In this study, the machinability of austempered ductile iron with dual phase structure was investigated. Specimens were intercritically austenitized (partially austenitized) in the two phase region (α + γ) at various temperatures (810, 820 and 830 °C) for 90 min, then quenched in a salt bath held at austempering temperatures of 315 °C or 375 °C for 120 min and then air cooled to room temperature to obtain various ausferrite volume fractions and morphologies. Machinability tests were carried out at various cutting speeds (150, 180 and 210 m min−1), at a constant feed rate (0.30 mm rev−1) and depth of cut at 2 mm after austempering heat treatment. The experimental results showed that austempered specimens from the (α + γ) temperature range exhibited better machinability than as-cast samples. On the other hand, the cutting force was decreased with increasing proeutectoid ferrite fractions. The results also showed that continuity of ausferritic structure along intercellular boundaries plays an important role in determining machinability of austempered ductile iron with different ausferrite volume fractions. Another important result is that higher proeutectoid volume fraction has negative effects on surface roughness.

Keywords: Machinability; Microstructure; Surface treatments; Ductile Iron
* Correspondence address, İsmail Ovali, Mechanical Programs, Hacettepe University, 06800, Beytepe-Ankara, Turkey, Fax: +90 312 297 67 95, Tel.: +90 312 297 67 95, E-Mail:

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Received: 2011-7-19
Accepted: 2012-7-25
Published Online: 2013-08-17
Published in Print: 2013-02-15

© 2013, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110849
Keywords for this article
Machinability; Microstructure; Surface treatments; Ductile Iron

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Structure of composites consolidated from ball milled 7475 aluminum alloy and ZrO2 powders
  5. Isothermal section of the Al-Tb-V ternary system at 773 K
  6. Development of an atomic mobility database for disordered and ordered fcc phases in multicomponent Al alloys: focusing on binary systems
  7. Effect of additive and current density on microstructure and texture characteristics of copper electrodeposits
  8. Magnetic properties and microwave absorption properties of carbon fibers coated with FeCo alloy
  9. Effects of BN content on the structural and mechanical properties of a-SiBN ceramics
  10. Structural and relaxor characteristics of Ca0.18Sr0.226Ba0.594Nb2O6
  11. Study on the dielectric properties of CaCu3Ti4O12 ceramics using the one-dimensional Ising model
  12. Erosion wear performance of a surface diffusion alloyed coating on pure magnesium
  13. Evaluation of the quality of cladding deposited on continuous steel casting rolls
  14. Investigating the machinability of austempered ductile irons with dual matrix structures
  15. Simple preperation of CuO nanoparticles and submicron spheres via ultrasonic spray pyrolysis (USP)
  16. Fabrication of transparent Nd:YAG ceramic by vacuum sintering with CaF2 additive
  17. Synthesis and characterization of new Bi2FeNiO6 material using a citric acid assisted gel combustion technique
  18. Processing and characterization of up-converting Er3+ doped (Lu0.5Y0.5)2O3 nanophosphor
  19. People
  20. People
  21. DGM News
  22. DGM News
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