Residual stress, phase, microstructure and mechanical property studies of ultrafine bainitic steel through laser shock peening

Subramanian Prabhakaran , Kalainathan Sivapuram, Pratik Shukla, Vasudevan, Vijay. K

Research output: Contribution to journalArticle

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.
Original languageEnglish
Pages (from-to)447-458
Number of pages12
JournalOptics and Laser Technology
Volume115
Early online date4 Mar 2019
DOIs
Publication statusPublished - 1 Jul 2019

Fingerprint

bainitic steel
peening
Shot peening
Steel
residual stress
Laser pulses
Residual stresses
shock
Fatigue of materials
mechanical properties
Automotive engineering
Mechanical properties
microstructure
Microstructure
Shear bands
Lasers
Grain refinement
structural engineering
Structural design
Strain hardening

Keywords

  • Bainitic ferrites
  • Fatigue
  • Hardness
  • Laser shock peening (LSP)
  • Plastic deformation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this

Residual stress, phase, microstructure and mechanical property studies of ultrafine bainitic steel through laser shock peening. / Prabhakaran , Subramanian ; Sivapuram, Kalainathan; Shukla, Pratik; Vijay. K, Vasudevan,.

In: Optics and Laser Technology, Vol. 115, 01.07.2019, p. 447-458.

Research output: Contribution to journalArticle

Prabhakaran , Subramanian ; Sivapuram, Kalainathan ; Shukla, Pratik ; Vijay. K, Vasudevan,. / Residual stress, phase, microstructure and mechanical property studies of ultrafine bainitic steel through laser shock peening. In: Optics and Laser Technology. 2019 ; Vol. 115. pp. 447-458.
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