Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Analysis Of The Effect Of Surface Oxidation On The Laser Transformation Hardening Of Cr-mo Steels
Year:2017
Research Areas
  • Mechanical engineering
Information
Abstract
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.
International
Si
Congress
13º Congresso Ibero-americano de Engenharia Mecânica
960
Place
Lisboa (Portugal)
Reviewers
Si
ISBN/ISSN
978-989-95683-4-1
Start Date
23/10/2017
End Date
26/10/2017
From page
107
To page
107
Atas do XII congressoIbero-Americano de Engenharia Mecânic
Participants
  • Autor: Francisco Cordovilla Baro (UPM)
  • Autor: Angel Garcia Beltran (UPM)
  • Autor: Jesus Domingez (Talens Group)
  • Autor: Paula Sancho (Talens-Group)
  • Autor: Jose Luis Ocaña Moreno (UPM)
Research Group, Departaments and Institutes related
  • 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
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