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Research Papers

Machinability of AISI 316 Austenitic Stainless Steel With Cryogenically Treated M35 High-Speed Steel Twist Drills

[+] Author and Article Information
Adem Çiçek

Department of Mechanical Engineering,
Faculty of Engineering and Natural Sciences,
Yıldırım Beyazıt University,
Ankara, Turkey 06050
e-mail: adecicek@yahoo.com

Ilyas Uygur

Department of Mechanical Engineering,
Faculty of Engineering,
Düzce University,
Düzce, Turkey 81620
e-mail: ilyasuygur@duzce.edu.tr

Turgay Kıvak

e-mail: turgaykivak@duzce.edu.tr

Nursel Altan Özbek

e-mail: nurselaltan@duzce.edu.tr
Cumayeri Vocational School of Higher Education,
Düzce University,
Düzce, Turkey 81700

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received March 14, 2011; final manuscript received August 22, 2012; published online November 1, 2012. Assoc. Editor: Patrick Kwon.

J. Manuf. Sci. Eng 134(6), 061003 (Nov 01, 2012) (6 pages) doi:10.1115/1.4007620 History: Received March 14, 2011; Revised August 22, 2012

In this paper, machinability of AISI 316 austenitic stainless steel was investigated using cryogenically treated and untreated high-speed steel (HSS) twist drills. Machinability of AISI 316 austenitic stainless steel was evaluated in terms of thrust force, tool life, surface roughness, and hole quality of the drilled holes. Experimental results showed from 14% to 218% improvements for treated tool lives. Thrust force, surface roughness, and hole quality are better with treated drills when compared with untreated drills. These improvements were mainly attributed to formation of fine and homogeneous carbide particles and transformation of retained austenite to martensite. Microhardness and microstructure observations verified these formations.

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Figures

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Fig. 1

Details of experimental setup

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Fig. 2

Variation of microstructure of (a) untreated and (b) cryogenically treated samples

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Fig. 3

High magnification microstructures of (a) untreated and (b) cryogenically treated samples

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Fig. 4

The effects of cryogenic treatment on the thrust force at different cutting speeds

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Fig. 5

The effects of cryogenic treatment on the surface roughness at different cutting speeds

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Fig. 6

The effects of cryogenic treatment on the hole diameter error at different cutting speeds

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Fig. 7

The effects of cryogenic treatment on the roundness error at different cutting speeds

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Fig. 8

SEM photographs of the twist drills used at Vc = 18 m/min and f = 0.12 mm/rev (a) with cryogenic treatment (after 60 holes) and (b) without cryogenic treatment (after 22 holes)

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Fig. 9

Numbers of holes for treated and untreated drills until the catastrophic failure

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