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Research Papers

Integrated Process of Laser-Assisted Machining and Laser Surface Heat Treatment

[+] Author and Article Information
Bin Shi

Aerospace Structure, Materials and
Manufacturing Laboratory,
National Research Council Canada (NRC),
5145 Avenue Decelles,
Montreal, PQ H3T 2B2, Canada
e-mail: bin.shi@nrc.ca

Helmi Attia

Aerospace Structure, Materials and
Manufacturing Laboratory,
National Research Council Canada (NRC),
5145 Avenue Decelles,
Montreal, PQ H3T 2B2, Canada
Department of Mechanical Engineering,
McGill University,
817 Sherbrooke Street West,
Montreal, PQ H3A 2K6, Canada
e-mail: helmi.attia@nrc.ca and helmi.attia@mcgill.ca

Manuscript received April 30, 2013; final manuscript received October 24, 2013; published online November 26, 2013. Assoc. Editor: Yung Shin.

J. Manuf. Sci. Eng 135(6), 061021 (Nov 26, 2013) (9 pages) Paper No: MANU-13-1196; doi: 10.1115/1.4025832 History: Received April 30, 2013; Revised October 24, 2013

A process is proposed for integrating the laser-assisted machining (LAM) and laser surface heat treatment (LSHT) in a single operation. Experimental and numerical investigations were carried out. LSHT tests were performed to investigate the effect of the process parameters on the microstructure evolution and hardenability. A methodology and an empirical model for prediction of hardened depth were proposed. A two-dimensional finite element (2D-FE) model was developed to predict the phase transformation during the LAM and LSHT processes. The optimization of the LAM process was also investigated using the developed finite element model.

Copyright © 2013 by ASME
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References

Figures

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Fig. 1

Flow chart of integrated LAM and LSHT operation

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Fig. 2

Experimental setup of LAM

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Fig. 3

(a) Experimental setup of LSHT and (b) laser scanning path on the workpiece

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Fig. 4

Optical micrographs of the microstructure in LSHT (Ccase 5: P = 500 W, Vs = 3.0 mm/s)

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Fig. 5

Process diagram of hardened depth versus power and scanning speed (Dl = 5 mm)

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Fig. 6

Plot of the empirical model of hardened depth

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Fig. 7

Mechanical and thermal processes coupled with microstructure evolution in the FE model

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Fig. 8

CCT diagram of AISI 1536

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Fig. 9

2D FE model of LAM and LSHT

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Fig. 10

Dependence of the flow stress on the temperature and strain (ε¯˙0 = 5 × 104  s−1)

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Fig. 11

Temperature history of a fixed point on the workpiece surface (P = 600 W and Vs = 25.0 mm/s)

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Fig. 12

Comparison of the force prediction with the conventional (C) and laser-assisted machining (LAM) experimental results

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Fig. 13

Predicted temperature field in LAM (P = 1050 W)

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Fig. 14

Laser power versus cutting force and temperature on the machined surface

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Fig. 15

FE simulation results for the LSHT under P = 500 W and Vs = 3 mm/s. (a) Predicted martensite; and (b) Martensitic volume fraction and temperature profiles in depth

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Fig. 16

Comparison of the predicted hardened depth with measurements

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Fig. 17

Comparison of the predicted hardness with experimental measurement

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