Laser nitriding of iron: Influence of the laser parameters on the nitriding efficiency

The influence of laser power and repetition rate on oxygen and nitrogen insertion into titanium using pulsed Nd:YAG laser irradiation

“…A study on the nitriding of iron [5] leads likewise to evidence of a threshold of nitriding, but in a nitrogen atmosphere. This threshold is close to 1.8 J/cm 2 .…”

“…The nitrogen dioxide in the air needs to be excited, even dissociated, before it can be inserted. That is the role of the plasma created on the surface of the target [5,17].…”

“….) [1][2][3][4][5][6][7]. Many studies have dealt with the influence of overlapping [8], of the nature of the surrounding gas [9], of the intensity of the laser beam on the morphology of the layers that are created [10], and on the nature of the phases that are formed [11].…”

Material transport during excimer-laser nitriding of iron

“…%. [13][14][15] The iron-nitrogen equilibrium phase diagram permits much higher nitrogen concentrations of up to 33 at. %.…”

Parametric study on laser nitriding of 1.5919 steel

“…In the last decade, several attempts were carried out to reveal the metallurgical phenomena that take place during reactive surface treatment of pure iron Illgner et al, 1995Illgner et al, , 1996Landry et al, 1999; with a pulsed excimer laser. Depending on the operational laser parameters (energy density, frequency, number of pulses and laser intensity distribution), nitrogen distribution reached a depth of about 300 nm, while the nitrogen content from 22 at.% at the surface was found to decrease to 4 at.% and the main phases identified within the treated zone were ␥-Fe(N), coexisting (␥ + ) and finally pure -Fe x N. Similar results were obtained in more recent studies on the excimer laser nitriding of steels (Schaaf et al, 1998 , the main difference being the formation of carbonitrides due to the presence of carbon.…”