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Research Papers: Gas Turbines: Manufacturing, Materials, and Metallurgy

Evaluating the Machinability of Inconel 718 Using Polar Diagrams

[+] Author and Article Information
Pajazit Avdovic

 Siemens Industrial Turbomachinery AB, SE-612 83 Finspong, Sweden; Department of Materials and Manufacturing Technology, Chalmers University of Technology, SE-22100 Lund, Swedenpajazit avdovic@siemens.com

Linhong Xu

Division of Production and Materials Engineering, LTH,  Lund University, Sweden; Division of Mechanical and Electrical, China University of Geosciences (Wuhan), Wuhan 430074, Chinaxulinhong@cug.edu.cn

Mats Andersson

Division of Production and Materials Engineering, LTH, Lund University, SE-22100 Lund, Swedenmats.andersson@iprod.lth.se

Jan-Eric Ståhl

Division of Production and Materials Engineering, LTH, Lund University, SE-22100 Lund, Swedenjan-eric.stahl@iprod.lth.se

J. Eng. Gas Turbines Power 133(7), 072101 (Mar 21, 2011) (7 pages) doi:10.1115/1.4002679 History: Received May 19, 2010; Revised May 21, 2010; Published March 21, 2011; Online March 21, 2011

The use of a polar diagram method for describing and evaluating the machinability of Inconel 718 was explored. Five key parameters of the work material, representing the mechanical and physical properties, which have the strongest influence on its machinability, were employed in the diagrams. These five parameters were integrated into a single polar diagram, used to describe the machinability of Inconel 718. Variations in the machinability of Inconel 718 products or components of a given type produced in different batches were analyzed. Industrial experiments were conducted to test the relationship between the polar diagram of the work material, its carbon content, and the tool wear of the ceramic cutting tools used in machining it. Work materials of Inconel 718 in which the polar diagrams of machinability were similar in size and shape exhibited very similar behavior during the cutting process. The polar diagram method employed appeared to be useful for selecting suitable cutting data for the machining of new materials.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

The microstructure of Inconel 718 containing various TiC particles

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Figure 2

Polar diagram for evaluating the machinability of a work material

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Figure 3

Variation in the properties of product components produced from different batches of Inconel 718

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Figure 4

Workpiece geometry (the cutting position for case 1 and case 2)

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Figure 5

Polar diagram of the machinability of the workpieces that were tested, case1

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Figure 6

Energy dispersive spectroscopy mapping of the Ti contents of Inconel 718

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Figure 7

A general illustration of the wear on a ceramic tool that can occur

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Figure 8

Flank wear on the 1.1 workpiece after 5 min of machining

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Figure 9

Flank wear on the 1.4 workpiece after 5 min of machining

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Figure 10

Polar diagrams of the machinability of the 1.1 and the 1.4 workpiece

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Figure 11

Carbon content of Inconel 718 versus flank wear

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Figure 12

Chip shape obtained in machining the 1.1 workpiece

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Figure 13

Chip shape obtained in machining the 1.3 workpiece

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Figure 14

Polar diagrams of machinability for the materials tested in case 2

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Figure 15

Polar diagrams of machinability corresponding to the maximum and the minimum tool flank wears in case 2

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Figure 16

Carbon content versus tool flank wear in case 2

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