Memorias de investigación
Ponencias en congresos:
Analysis Of The Effect Of Surface Oxidation On The Laser Transformation Hardening Of Cr-mo Steels
Año:2017
Áreas de investigación
  • Ingenieria mecanica
Datos
Descripción
Laser surface hardening is a technology that enables important advantages to be obtained in comparison with conventional techniques in terms of accuracy of the heat affected zone and productivity. Nevertheless, the development of realistic and flexible models has to be fulfilled in order to control the effects of every set of process conditions. Despite many different models having been developed, very few of them deal with the increment of absorption related with the instantaneous value of the layer of oxide growth during the process in a non-protective atmosphere. This work analyzes, on one hand, the problem of oxide formation at the external surface using kinetic relations, whose parameters have been related with the process variables, considering non-equilibrium conditions. Then, the oxide thickness was associated with a value of absorption through an innovative formula that considers the path of the laser radiation in the interface oxide-base material. On the other hand, when the dimensions of the surface to be treated are larger than the cross section of the laser beam several overlapped tracks are needed, and the distance between consecutive tracks becomes a fundamental design parameter. This work aims to optimize such parameter with the purpose of fulfilling a set of initial requirements avoiding the softening of the martensite achieved in the previous track. The model, in conjunction with a convenient geometrical characterization of the heat affected zone, enables a design strategy to be implemented which, using metallurgical and hardness maps, has the capability of attending different criteria. All the conditions proposed in the design of a suitable overlapping distance have been reproduced empirically for the case of the 42CrMo4 steel.
Internacional
Si
Nombre congreso
13º Congresso Ibero-americano de Engenharia Mecânica
Tipo de participación
960
Lugar del congreso
Lisboa (Portugal)
Revisores
Si
ISBN o ISSN
978-989-95683-4-1
DOI
Fecha inicio congreso
23/10/2017
Fecha fin congreso
26/10/2017
Desde la página
107
Hasta la página
107
Título de las actas
Atas do XII congressoIbero-Americano de Engenharia Mecânic
Esta actividad pertenece a memorias de investigación
Participantes
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Grupo de Investigación en Ingeniería y Aplicaciones del Láser
  • Centro o Instituto I+D+i: Centro Laser
  • Departamento: Física Aplicada e Ingeniería de Materiales
  • Departamento: Automática, Ingeniería Eléctrica y Electrónica e Informática Industrial