Analysis Of The Effect Of Surface Oxidation On The Laser Transformation Hardening Of Cr-mo Steels

Cordovilla Baró, Francisco and García Beltrán, Ángel and Domíngez, Jesús and Sancho, Paula and Ocaña Moreno, José Luis (2017). Analysis Of The Effect Of Surface Oxidation On The Laser Transformation Hardening Of Cr-mo Steels. In: "CIBEM 2017 - XIII Congresso Ibero-Americano de Engenharia Mecânica", 23-26 Octubre 2017, Lisboa (Portugal). pp. 1-8.

Description

Title: Analysis Of The Effect Of Surface Oxidation On The Laser Transformation Hardening Of Cr-mo Steels
Author/s:
  • Cordovilla Baró, Francisco
  • García Beltrán, Ángel
  • Domíngez, Jesús
  • Sancho, Paula
  • Ocaña Moreno, José Luis
Item Type: Presentation at Congress or Conference (Article)
Event Title: CIBEM 2017 - XIII Congresso Ibero-Americano de Engenharia Mecânica
Event Dates: 23-26 Octubre 2017
Event Location: Lisboa (Portugal)
Title of Book: CIBEM 2017 - XIII Congresso Ibero-Americano de Engenharia Mecânica
Date: October 2017
Subjects:
Freetext Keywords: Laser-Hardening; Annealing; Martensite; Oxidation; Steel
Faculty: E.T.S.I. Industriales (UPM)
Department: Física Aplicada e Ingeniería de Materiales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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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.

More information

Item ID: 50007
DC Identifier: http://oa.upm.es/50007/
OAI Identifier: oai:oa.upm.es:50007
Official URL: http://redenacionaldecombustao.org/13o-congresso-ibero-americano-de-engenharia-mecanica-cibem
Deposited by: Memoria Investigacion
Deposited on: 12 Jun 2018 15:27
Last Modified: 27 Oct 2018 22:30
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