Subramaniyan, P.; Kalainathan, S.; Shukla, P.; Vasudevan, V.K. Residual Stress, Phase, Microstructure and Mechanical Property Enhancement of Ultrafine Bainitic Steel through Laser Shock Processing. Preprints2018, 2018040362. https://doi.org/10.20944/preprints201804.0362.v1
APA Style
Subramaniyan, P., Kalainathan, S., Shukla, P., & Vasudevan, V.K. (2018). Residual Stress, Phase, Microstructure and Mechanical Property Enhancement of Ultrafine Bainitic Steel through Laser Shock Processing. Preprints. https://doi.org/10.20944/preprints201804.0362.v1
Chicago/Turabian Style
Subramaniyan, P., Pratik Shukla and Vijay K Vasudevan. 2018 "Residual Stress, Phase, Microstructure and Mechanical Property Enhancement of Ultrafine Bainitic Steel through Laser Shock Processing" Preprints. https://doi.org/10.20944/preprints201804.0362.v1
Abstract
The 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 and nanomechanical properties were significantly enhanced. A fully reversed (R= -1) high-cycle fatigue tests extended the lifespan by an average of fifteen times than the untreated. Also, it has potential to repair the structural components effectively.
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Commenter: Roland
The commenter has declared there is no conflict of interests.