Pulsed Nd: YAG laser shock processing effects on mechanical properties of 6061-T6 alloy
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Date
2014
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Abstract
The aim of this paper is to investigate effects of single and double shot Nd:YAG laser shock processing (LSP) on residual stress, micro-hardness and tensile properties of 6061-T6 aluminum alloy. The X-ray diffraction technique was used to measure surface residual stress in LSP-treated 6061-T6 samples. The magnitude and directional dependence of the surface residual stress after single shot and double shot LSP were investigated with the sin2 Ψ method. The results show that laser shock processing can significantly increase surface compressive residual stress. In addition, micro-hardness of the LSP-treated sample was measured using a Vickers diamond indenter depending on the depth. The tensile tests of the single shot and double shot LSP-treated and untreated samples were carried out by the Schimadzu tensile testing machine having a video extensometer. Experimental results show that the values of micro-hardness, tensile strength and uniform elongation increase by LSP. © 2013 Elsevier Ltd. All rights reserved.
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Keywords
Cerium alloys , Hardness , Materials testing apparatus , Residual stresses , Tensile strength , Tensile testing , X ray diffraction , 6061-T6 aluminum alloy , Compressive residual stress , Directional dependence , Investigate effects , Laser shock processing , Surface residual stress , Tensile testing machines , X-ray diffraction techniques , Neodymium lasers