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Research Papers: FORMING

Generation of a Fine Grain Layer in the Vicinity of Frictional Interfaces in Direct Extrusion of AZ31 Alloy

[+] Author and Article Information
Sergei Alexandrov

A. Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Sciences,
101-1 Prospect Vernadskogo,
Moscow 119526, Russia e-mail: sergei_alexandrov@spartak.ru

Yeau-Ren Jeng

Department of Mechanical Engineering, Advanced Institute of Manufacturing With High-Tech Innovations,
National Chung Cheng University,
168, Sec. 1, University Road, Ming-Hsiung, Chia-Yi 621, Taiwan
e-mail: imeyrj@ccu.edu.tw

Yeong-Maw Hwang

Department of Mechanical and Electro-Mechanical Engineering,
National Sun Yat Sen University,
70, Lienhai Road,
Kaohsiung 80424, Taiwan e-mail: ymhwang@mail.nsysu.edu.tw

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received November 30, 2014; final manuscript received March 15, 2015; published online September 4, 2015. Assoc. Editor: Yannis Korkolis.

J. Manuf. Sci. Eng 137(5), 051003 (Sep 04, 2015) (9 pages) Paper No: MANU-14-1642; doi: 10.1115/1.4030267 History: Received November 30, 2014

The present paper deals with the generation of hard layers in the vicinity of frictional interfaces in metal forming processes. The primary objective of the paper is to introduce a general approach to relate the strain rate intensity factor and parameters that characterize the microstructure and thickness of such layers. This approach is used in conjunction with axisymmetric direct extrusion of an AZ31 alloy. The thickness of the hard layer is determined experimentally. Also determined is the distribution of average grain size and hardness near the friction surface. The strain rate intensity factor is found using an available semi-analytical solution.

Copyright © 2015 by ASME
Topics: Friction , Alloys , Extruding
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Figures

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Fig. 14

Distribution of hardness in the vicinity of the friction surface after extrusion through the die of φ=10deg. The thickness of the hard layer is about 32 μm.

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Fig. 15

Distribution of hardness in the vicinity of the friction surface after extrusion through the die of φ=15deg. The thickness of the hard layer is about 36 μm.

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Fig. 13

Distribution of hardness in the vicinity of the friction surface after extrusion through the die of φ=5deg. The thickness of the hard layer is about 26 μm.

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Fig. 12

Distribution of hardness along the radius of the sample after extrusion through the die of φ=15deg

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Fig. 11

Distribution of hardness along the radius of the sample after extrusion through the die of φ=10deg

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Fig. 10

Distribution of hardness along the radius of the sample after extrusion through the die of φ=5deg

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Fig. 9

Distribution of average grain size along the radius of the sample after extrusion through the die of φ=15deg

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Fig. 8

Distribution of average grain size along the radius of the sample after extrusion through the die of φ=10deg

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Fig. 7

Distribution of average grain size along the radius of the sample after extrusion through the die of φ=5deg

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Fig. 6

Microstructure of extruded material at the axis of symmetry (a) and near the friction surface (b) after extrusion through the die of φ=15deg

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Fig. 5

Microstructure of extruded material at the axis of symmetry (a) and near the friction surface (b) after extrusion through the die of φ=10deg

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Fig. 4

Microstructure of extruded material at the axis of symmetry (a) and near the friction surface (b) after extrusion through the die of φ=5deg

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Fig. 3

Initial microscrusture of AZ31 alloy (billet material) at center (a) and surface (b)

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Fig. 2

Design of sample for extrusion

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Fig. 1

Illustration of the extrusion die

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Fig. 16

Flow through infinite channel

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Fig. 17

Variation of the dimensionless strain rate intensity factor with X at several values of φ

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