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Prabhakaran, Subramanian
in Cooperation with on an Cooperation-Score of 37%
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Publications (4/4 displayed)
- 2019Residual stress, phase, microstructure and mechanical property studies of ultrafine bainitic steel through laser shock peeningcitations
- 2018Enhanced surface and mechanical properties of bioinspired nanolaminate graphene-aluminium alloy nanocomposites through laser shock processing for biomedical implant and engineering applicationscitations
- 2018Laser shock peening without coating induced residual stress distribution, wettability characteristics and enhanced pitting corrosion resistance of austenitic stainless steelcitations
- 2018Laser cleaning of grey cast iron automotive brake disc
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article
Residual stress, phase, microstructure and mechanical property studies of ultrafine bainitic steel through laser shock peening
Abstract
The aimed study proposes laser shock peening without a coating of high strength ultrafine bainitic steel to mitigating the fatigue failures for automotive and structural engineering applications. Laser pulse density of 2500 pulses/cm2 (75% overlapping) was optimised based on the induced residual stresses for employing the wide range of characterisations. The roughness and topographic results showed that surface roughening was controlled by tuning the laser pulse density. The High-Resolution X-ray Diffraction analysis confirmed the lattice misorientation resulting peak shift and the trend towards martensite phase transformations. The electron microscopic micro/nanostructure analyses revealed the grain refinement features such as nano-twins, micro shear bands and shear cells. The work hardening depth analysis indicates the significant enhancement in the mechanical properties. Completely reversed (R = −1) high-cycle fatigue tests extended the lifespan by an average of five times than the untreated. Also, it has potential to repair the structural components effectively.<br/>