Assessment of parameters variations for treatment of CO2 laser carburizing over AISI 4340 steel

Renato Barros (1) , Karl Delbé (2) , Jean Denape (2) , Humberto Rodrigues (3) , Jorge Abdalla (4)

1 UNESP - Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University
2 LGP - Laboratoire Génie de Production
3 Faculdade de Tecnologia e Ciências - FATEC (BRAZIL)
4 Departamento de Ciência e Tecnologia Aeroespacial - DCTA (BRAZIL)

This study evaluated the best parameters for the carburizing treatment using a CO2 laser of low power over an AISI 4340 steel previously subjected to heat treatments of quenching and tempering. The coating process used a liquid dispersion of carbon black in ethanol and carboxyl methylcellulose. The laser power was kept constant at 125 W and the resolution is 600 dots per inch. The variable parameter of CO2 laser was the speed. Two speeds were selected for the coating preparation: 1200 and 2000 m/s. After treatment, metallographic preparation and optical microscopy observation were performed in addition to the evaluation of parameter variations through hardness measurements and microscratch tests.

Mots clés: AISI 4340 steel; Surface treatments; Laser carburizing; Microscratch tests

Domaines: Mécanique des matériaux [physics.class-ph]

Renato Barros, Karl Delbé, Jean Denape, Humberto Rodrigues, Jorge Abdalla. Assessment of parameters variations for treatment of CO2 laser carburizing over AISI 4340 steel. Journées Internationales Francophones de Tribologie, May 2015, Nantes, France. pp.1-2. ⟨hal-03662179⟩