Journal ArticleDOI
Wear and corrosion resistance of laser surface hardened structural steel
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In this paper, a CO 2 laser surface treatment in solid state has been performed on a CK60 structural steel and wear tests revealed the improved wear resistance of the laser treated specimens in comparison with the untreated one.Abstract:
CO 2 laser surface treatment in solid state has been performed on a CK60 structural steel. The laser energy density was lower than the melting threshold and only caused surface hardening. The observed heat affected zone (HAZ) ranged in depths of 50–430 μm. Microstructure of the HAZ was composed of needle, fine-grained martensite and small amount of pearlite and retained austenite. Microhardness values changed in areas of overlapping successive laser passes. Wear tests revealed the improved wear resistance of the laser treated specimens in comparison with the untreated one. Specimens laser treated using 0 and 38% overlapping ratios exhibited improved wear resistance. The corrosion resistance exhibited a tendency to decrease with increasing overlapping ratios. Among all specimens studied the one, which was laser treated with 0% overlapping ratio presented the best wear and corrosion behaviour.read more
Citations
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Predictive modeling of multi-track laser hardening of AISI 4140 steel
TL;DR: In this article, a numerical model was developed to predict the back tempering in multi-track laser hardening of AISI 4140 steel, and the prediction and parameters optimized to obtain maximum case depth with the least variation along width of the hardened zone were experimentally verified.
Journal ArticleDOI
Predictive modeling and experimental results for residual stresses in laser hardening of AISI 4140 steel by a high power diode laser
TL;DR: In this article, a predictive model for residual stresses induced in a laser hardened workpiece of AISI 4140 steel with no melting has been developed and experimentally verified, where a transient three-dimensional thermal and kinetic model is first solved to obtain the temperature and solid phase history of the workpiece, which is then sequentially coupled to a threedimensional stress model to predict residual stresses.
Journal ArticleDOI
Predictive modeling and experimental results for laser hardening of AISI 1536 steel with complex geometric features by a high power diode laser
Stephen Skvarenina,Yung C. Shin +1 more
TL;DR: In this paper, a three-dimensional thermal model is used to predict the workpiece temperature distribution, which is coupled to a two-dimensional kinetic model to predict hardness and phase distribution.
Journal ArticleDOI
Experimental studies on the microstructure and hardness of laser transformation hardening of low alloy steel
TL;DR: In this article, an experimental investigation with Nd:YAG laser system was carried out to study the effects of laser hardening process parameters on the microstructure and hardness during laser harden of EN25 s.
Journal ArticleDOI
The influence of laser hardening on wear in the valve and valve seat contact
TL;DR: In this paper, a laser has been used to treat the valve seat area of a cast iron cylinder head and preliminary tests were carried out to investigate the fundamental wear characteristics of untreated cast iron and also cast iron with a range of laser treatments.
References
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Book
Laser Material Processing
TL;DR: In this paper, the effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1).
Journal ArticleDOI
Laser transformation hardening of iron-carbon and iron- carbon- chromium steels
John R. Bradley,Sooho Kim +1 more
TL;DR: In this article, a 2 kW CO2 laser was used to scan the steel surfaces at various rates, and the laser transformation hardening response of Fe 0.5C-0.8Mn and Fe- 0.8Cr steels was examined, and calculated and measured hardened depths yielded values of the effective coupling coefficient of the laser beam to the steel which varied as a function of beam interaction time.
Journal ArticleDOI
The corrosion behaviour of laser treated NiP alloy coatings on mild steel
TL;DR: In this paper, two Ni-P coatings of different thickness on a mild steel are submitted to laser surface melting at different scanning rates, and it is shown that the initial corrosion rates of the electroless Ni-p coatings submitted to the laser treatment are lower than those in electroless non-Ni-P coating without laser treatment.
Journal ArticleDOI
Wear behavior of anti-galling surface textured gray cast iron using pulsed-CO2 laser treatment
TL;DR: In this article, surface modification of BS300 gray cast iron, using high power pulsed-CO 2 laser irradiation, is adopted in order to establish an anti-galling surface texture and, therefore, to improve wear and friction behavior.
Journal ArticleDOI
Laser surface treatments to improve the intergranular corrosion resistance of 18/13/Nb and 304L in nitric acid
TL;DR: In this paper, surface melting of 18/13/Nb austenitic stainless steel, using a 2 kW continuous wave CO2 laser is shown to improve the resistance of the material to the propagation of localised, "intergranular, corrosion" (end grain attack).