Laser nitriding an element made of titanium alloy by blowing nit

Details Laser nitriding an element made of titanium alloy by blowing nit Laser nitriding an element made of titanium alloy by blowing nit

1993-10-08

1995-05-09

Roy, Upendra

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148559, 148903, B23K 2600, B23K 2700

Patent

active

054136415

ABSTRACT:
A method of nitriding a piece made of titanium alloy, in which a laser beam is directed onto the piece to obtain a small amount of surface melting in the impact zone of the laser, nitrogen under high pressure is blown immediately behind the impact zone of the laser beam so that the nitrogen penetrates into the impact zone once it has become semi-solid, and an inert gas is blown around the nitrogen so as to cover and overlap the laser impact zone. The apparatus of the invention includes a central tube for conveying the nitrogen and a circularly symmetrical duct around the axis of the central tube having inside and outside walls that are conical and that serve to convey the inert gas. The invention serves to obtain a hard surface layer having a thickness of 1 mm to 2 mm.

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patent: 4825035 (1989-04-01), Moriyasu et al.
Akgun et al. Jour. Mat. Science, 27 (Mar. 1992) 1404.
Liu et al. Surface & Coating Tech. 57 (1993) 191.
D'Anna et al. Jour. Appl. Phys. 69 (1991) 1687.

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