The influence of different conditions of laser-beam interaction in laser surface hardening of steels

Grum, Janez; Kek, Tomaž

doi:10.1016/j.tsf.2003.11.177

Cited by 18 publications

(12 citation statements)

References 2 publications

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“…Factorial design is particularly useful when an influence of at least two factors to an output response of the experimental process is treated [38,39], Fig. 7 shows the response surface and contour plot diagram of micro-hardness in the longitudinal and transverse directions of the LSPwC surface scan, respectively.…”

Section: Micro-hardness and Residual Stressesmentioning

confidence: 99%

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Trdan

Porro

Ocaña

et al. 2012

Surface and Coatings Technology

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The influence of nanosecond laser pulses applied by laser shock peening without absorbent coating (LSPwC) with a Q-switched Nd:YAG laser operating at a wavelength of \ = 1064 nm on 6082-T651 Al alloy has been investigated. The first portion of the present study assesses laser shock peening effect at two pulse densities on three-dimensional (3D) surface topography characteristics. In the second part of the study, the peening effect on surface texture orientation and micro-structure modification, i.e. the effect of surface craters due to plasma and shock waves, were investigated in both longitudinal (L) and transverse (T) directions of the laser-beam movement. In the final portion of the study, the changes of mechanical properties were evaluated with a residual stress profile and Vickers micro-hardness through depth variation in the near surface layer, whereas factorial design with a response surface methodology (RSM) was applied. The surface topographic and micro-structural effect of laser shock peening were characterised with optical microscopy, InfiniteFocus® microscopy and scanning electron microscopy (SEM). Residual stress evaluation based on a hole-drilling integral method confirmed higher compression at the near surface layer (33 um) in the transverse direction (Omin) of laser-beam movement, i.e. -407 ±81 MPa and -346 ± 124 MPa, after 900 and 2500 pulses/cm 2 , respectively. Moreover, RSM analysis of micro-hardness through depth distribution confirmed an increase at both pulse densities, whereas LSPwC-generated shock waves showed the impact effect of up to 800 um below the surface. Furthermore, ANOVA results confirmed the insignificant influence of LSPwC treatment direction on micro-hardness distribution indicating essentially homogeneous conditions, in both I and T directions.

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Section: Micro-hardness and Residual Stressesmentioning

confidence: 99%

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Trdan

Porro

Ocaña

et al. 2012

Surface and Coatings Technology

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show abstract

“…The sample surface needs to be uniform and thus the application of graphite coating could be considered while it may enhance and equalize the absorptance. As Grum and Kek (2004) reported, the even application of the coating is, however, difficult and also too thick a coating can produce a barrier to heat conduction to the sample. In addition, the graphite coating thickness needs to be measured prior to laser processing.…”

Section: Discussionmentioning

confidence: 97%

Optimized laser processing of calibration blocks for grinding burn detection with Barkhausen noise

Santa-aho

Vippola

Sorsa

et al. 2012

Journal of Materials Processing Technology

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“…steels [23][24][25][26][27][28] and gray irons [29][30][31][32][33][34]. Nevertheless, other lasers like fiber [35] or Nd: YAG [36,37] can be applied to modify gray iron surface.…”

Section: Introductionmentioning

confidence: 99%

The evaluation of the influence of laser treatment parameters on the type of thermal effects in the surface layer microstructure of gray irons

Paczkowska

2016

Optics & Laser Technology

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The influence of different conditions of laser-beam interaction in laser surface hardening of steels

Cited by 18 publications

References 2 publications

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Optimized laser processing of calibration blocks for grinding burn detection with Barkhausen noise

The evaluation of the influence of laser treatment parameters on the type of thermal effects in the surface layer microstructure of gray irons

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