Segmented chips are known to form in machining of titanium alloys due to localization of heat in the shear zone, which is a function of machining environment. To investigate the correlation between machining environments and microstructural aspects of chip segmentation, orthogonal turning experiments were performed under three machining environments, viz., room, LN2, and 260 °C. Scanning electron and optical microscopy of chip roots show that the mechanism of chip segment formation changes from plastic strain and mode II fracture at room temperature, to predominant mode I fracture at LN2 and plastic strain leading to shear band formation at 260 °C. The chip segment pitch and shear plane length predicted using Deform™ matched well with the experimental values at room temperature. The microstructural analysis of chips show that higher shear localization occurs at room temperature than the other two temperatures. The depth of machining affected zone (MAZ) on work surfaces was lower at the two temperatures than that of at the room temperature at a higher cutting speed of 91.8 m/min.
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January 2015
Research-Article
Microstructural Characterization of Chip Segmentation Under Different Machining Environments in Orthogonal Machining of Ti6Al4V
Shashikant Joshi,
Shashikant Joshi
Department of Mechanical Engineering,
Indian Institute of Technology Bombay
,Powai, Mumbai 400 076
, India
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Asim Tewari,
Asim Tewari
Department of Mechanical Engineering,
Indian Institute of Technology Bombay
,Powai, Mumbai 400 076
, India
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Suhas S. Joshi
Suhas S. Joshi
1
Department of Mechanical Engineering,
e-mail: ssjoshi@iitb.ac.in
Indian Institute of Technology Bombay
,Powai, Mumbai 400 076
, India
e-mail: ssjoshi@iitb.ac.in
1Corresponding author.
Search for other works by this author on:
Shashikant Joshi
Department of Mechanical Engineering,
Indian Institute of Technology Bombay
,Powai, Mumbai 400 076
, India
Asim Tewari
Department of Mechanical Engineering,
Indian Institute of Technology Bombay
,Powai, Mumbai 400 076
, India
Suhas S. Joshi
Department of Mechanical Engineering,
e-mail: ssjoshi@iitb.ac.in
Indian Institute of Technology Bombay
,Powai, Mumbai 400 076
, India
e-mail: ssjoshi@iitb.ac.in
1Corresponding author.
Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received January 8, 2014; final manuscript received October 9, 2014; published online November 7, 2014. Assoc. Editor: Toshio Nakamura.
J. Eng. Mater. Technol. Jan 2015, 137(1): 011005 (16 pages)
Published Online: January 1, 2015
Article history
Received:
January 8, 2014
Revision Received:
October 9, 2014
Online:
November 7, 2014
Citation
Joshi, S., Tewari, A., and Joshi, S. S. (January 1, 2015). "Microstructural Characterization of Chip Segmentation Under Different Machining Environments in Orthogonal Machining of Ti6Al4V." ASME. J. Eng. Mater. Technol. January 2015; 137(1): 011005. https://doi.org/10.1115/1.4028841
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