Nondestructive evaluation and real-time monitoring of laser surface hardening

Xu, Zhiyue; Leong, Keng H.; Reed, C. B.

doi:10.1016/j.jmatprotec.2007.12.030

Cited by 10 publications

(2 citation statements)

References 4 publications

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“…Schneider et al 10 correlated surface wave velocity to surface hardness of laser hardened turbine blades. Xu et al 11 correlated infrared emissions generated during LTH to estimate resultant case depth and hardness. Various numerical and analytical models have also been developed to estimate dimensions of laser transformation hardened zone, although a major limitation of these simulations is uncertainty regarding absorption of laser radiation 12…”

Section: Introductionmentioning

confidence: 99%

Microstructural characterisation of laser surface treated AISI 1040 steel with portable X-ray stress analyzer

Ganesh

Kumar

Kaul

et al. 2013

Surface Engineering

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An experimental study was performed for non-destructive microstructural characterisation of laser surface treated AISI 1040 steel specimens with a portable X-ray diffraction based residual stress analysis system. Laser treated specimens were characterised by residual stress and (211) ferrite peak width measurements, and results were compared with those obtained by optical microscopy. The techniques were sensitive enough to distinguish four different cases arising during laser surface treatment, namely, no transformation hardening, insufficient hardening, adequate transformation hardening and surface melting. On the laser treated surface, the extents of laser melted zone and various microstructural zones of solid state transformation hardened region could be clearly identified. Although both the techniques provided fair estimate of total width of laser treated region, ferrite peak width is a more sensitive parameter to record microstructural transitions involving change in tetragonality of martensite. The technique has a potential for in situ microstructural analysis of ferritic steel weldments.

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Section: Introductionmentioning

confidence: 99%

Microstructural characterisation of laser surface treated AISI 1040 steel with portable X-ray stress analyzer

Ganesh

Kumar

Kaul

et al. 2013

Surface Engineering

View full text Add to dashboard Cite

show abstract

“…The phase transformations, variations in microstructure, and the changes of hardness were characterized with the aid of differential interference contrast (DIC) images. Xu et al (2008) used a real-time infrared process monitoring technique and developed a process model. The model has the threshold laser processing values to determine a specified hardness of the heat treated material.…”

Section: Introductionmentioning

confidence: 99%