The role of metallurgical solid state phase transformations on the formation of residual stress in laser cladding and heating
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Date
2014-02
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Publisher
Trans Tech Publications
Abstract
There are two major types of solid state phase transformations in metallic materials; the formation of second phase particles during heat treatments, and the transformation of the matrix from one crystalline packing arrangement to another during either heating or cooling. These transformations change the spacing between adjacent atoms and can thus influence the residual stress levels formed. The heating and cooling cycles of materials processing operations using lasers such as cladding and melting/heating, can induce phase transformations depending on the character of the material being processed. This paper compares the effects of the different phase transformations and also the influence of the type of laser processing on the final residual stress formed. The comparisons are made between laser clad AA7075, laser clad Ti-6Al-4V and laser melted nickel-aluminium bronze using neutron diffraction and the contour method of measuring residual stress. © 2014 Trans Tech Publications.
Description
Keywords
Metallurgy, Solid state physics, Residual stresses, Cladding, Heating, Phase transformations, Neutron diffraction, Nickel, Aluminium
Citation
Cottam, R., Luzin, V., Thorogood, K., Wong, Y. C., & Brandt, M. (2014). The role of metallurgical solid state phase transformations on the formation of residual stress in laser cladding and heating. Paper presented to the MECA SENS 2013 : 7th International Conference on Mechanical Stress Evaluation by Neutron and Synchrotron Radiation, 10-12 September 2013, Sydney, Australia. In Thomas, M Holden, Onrej Muránsky & Corey J. Hamelin (Eds,), Mechanical stress evaluation by neutrons and synchrotron radiation VII : selected, peer reviewed papers from the 7th International Conference on Mechanical Stress Evaluation by Neutrons and Synchrotron Radiation (MECA SENS VII 2013), September 10-12, 2013, Sydney, Australia, Durnten-Zurich, Switzerland : Trans Tech Publications Ltd. (Materials Science Forum, 777, 19-244). doi:10.4028/www.scientific.net/MSF.777.19