Preprint Article Version 1 This version is not peer-reviewed

Residual Stress, Phase, Microstructure and Mechanical Property Enhancement of Ultrafine Bainitic Steel through Laser Shock Processing

Version 1 : Received: 27 April 2018 / Approved: 27 April 2018 / Online: 27 April 2018 (15:59:27 CEST)

How to cite: 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. Preprints 2018, 2018040362 (doi: 10.20944/preprints201804.0362.v1). 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. Preprints 2018, 2018040362 (doi: 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.

Subject Areas

Laser Shock Peening (LSP); bainitic ferrites; plastic deformation; hardness; fatigue

Comments (1)

Comment 1
Received: 27 April 2018
Commenter: Roland
The commenter has declared there is no conflict of interests.
Comment: Excellent paper. very neat and systematically investigated. Congratulations to the authors.
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