Modelling of temperature evolution on metals during laser hardening process

Yáñez, A.; Alvarez, J.C.; Díaz, Ana Jesús López; Nicolás, G.; Pérez, José Antonio; Ramil, A.; Saavedra, E.

doi:10.1016/s0169-4332(01)00696-1

Cited by 47 publications

(22 citation statements)

References 14 publications

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“…Beer's law fits the given values of fluence thresholds for stainless steel F th SS = 1.14±0.29 J/cm 2 and titanium alloy F th Ti64 = 1.08±0.83 J/cm 2 . These values are very close to the lowest values reported in metals, typically 1-10 J/cm 2 [21].…”

Section: Methodssupporting

confidence: 87%

Comparative study of surface structuring of biometals by UV nanosecond Nd:YVO4 laser

Fiorucci

Díaz

Ramil

2014

Int J Adv Manuf Technol

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The aim of this paper is to analyze the influence of the working parameters in the micromachining process of stainless steel 316L and Ti6Al4V by means of a 355nm Nd:YVO4 nanosecond laser. Our target is the surface texturing of biometallic implants to favor osseointegration. With this purpose, well-organized structures, a matrix of pits, and a pattern of grooves were created under different laser parameters and irradiation schemes on metallic surface. Processed metal surfaces were characterized by confocal microscopy and scanning electron microscopy to establish the most adequate processing parameters to generate textured sizes in a range suitable for biomedical applications.

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Section: Methodssupporting

confidence: 87%

Comparative study of surface structuring of biometals by UV nanosecond Nd:YVO4 laser

Fiorucci

Díaz

Ramil

2014

Int J Adv Manuf Technol

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“…El modelo utilizado, como ocurre en otros modelos de tratamiento térmico, tiene las siguientes entradas [2]:…”

Section: Modelado Del Procesounclassified

Modelización y monitorización de procesos de refusión láser de recubrimientos depositados por plasma

Amado¹,

Álvarez²,

Nicolás³

et al. 2004

Bol. Soc. Esp. Ceram. Vidr.

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Este artículo describe un estudio teórico y experimental del proceso de refusión, por láser de CO 2 , de recubrimientos depositados por plasma. Se trata de lograr mediante el proceso de refusión una buena unión metalúrgica entre recubrimiento y sustrato, entre las diferentes partículas que componen el recubrimiento y de este modo evitar que el recubrimiento sea frágil y tenga una baja adherencia con el sustrato. En una primera aproximación la modelización sirvió de ayuda para lograr los parámetros adecuados que permitiesen fundir toda la capa proyectada junto con una mínima porción del sustrato para minimizar el grado de dilución. La modelización presentada incluye algunos aspectos que ayudan a describir el cambio de fase asociado a la refusión, estos son la utilización de las propiedades termofísicas adecuadas y la variación del coeficiente de absorción en el paso de la fase sólida a la fundida. Los resultados de la monitorización refuerzan el conocimiento del proceso y ayudan a la validación del modelo. Los resultados consisten en la predicción, con bastante precisión, de la forma y tamaño de las regiones fundidas para diferentes condiciones del proceso, lo que permite realizar el estudio paramétrico con la ayuda del computador, minimizando pruebas experimentales. Palabras Clave: Refusión por láser, Modelo de elementos finitos, Transmisión de Calor, Monitorización en Tiempo Real. Modelling and monitoring of laser refusion processes of coatings obtained by plasmaThis paper shows a theoretical and experimental study of the CO2 laser remelting of plasma sprayed coatings. The aim of the process is the decrease of the porosity to improve the layer properties. In a first approach simulation helps in finding the right process parameters, those parameters allow the melting of the sprayed layer and a minimal amount of substrate material to minimize dilution. The presented modelling includes several features allowing the description of phase transition in the remelting process, the main point is the use of different absorption coefficient in the two phases. Monitoring results gave additional information about the process and another way of doing process validation. The main result are is the prediction size and shape of the remelted layers and due to that the simulation code can be used in the parameter finding and plays an important role in the complete understanding of the process. Keywords: Laser remelting, Finite Element Modelling, Heat Transfer, On-line Monitoring IntroduccIónLos procesos industriales de tratamiento de materiales con láser más tradicionales son el corte, la soldadura, el taladrado y los tratamientos superficiales, todos ellos han sido ya estudiados tanto de manera teórica como experimental, como denominador común a todos ellos es necesario hacer notar que los parámetros experimentales que han de ser ajustados son la potencia incidente, la velocidad relativa entre la pieza y el haz y el diámetro de este último.Entre los tratamientos térmicos superficiales se encuentra la refusión por láser, en este ...

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“…This process depends highly on the properties of the processed material and the laser itself, therefore modeling and simulation of this phenomenon plays a key role in proper selection of these properties. Analytical methods can be used to simulate these problems (Brugger, 1972;Warren and Spark, 1990; Al-Nimr et al, 2002; Yanez et al, 2002), but they are rather used to solve problems defined with elementary shape areas and elementary boundary conditions. In more complex cases numerical methods are used.…”

Section: Introductionmentioning

confidence: 99%

Parametric Integral Equations Systems Method In Solving Unsteady Heat Transfer Problems For Laser Heated Materials

Sawicki

Zieniuk

2015

Acta Mechanica Et Automatica

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Abstract:One of the most popular applications of high power lasers is heating of the surface layer of a material, in order to change its properties. Numerical methods allow an easy and fast way to simulate the heating process inside of the material. The most popular numerical methods FEM and BEM, used to simulate this kind of processes have one fundamental defect, which is the necessity of discretization of the boundary or the domain. An alternative to avoid the mentioned problem are parametric integral equations systems (PIES), which do not require classical discretization of the boundary and the domain while being numerically solved. PIES method was previously used with success to solve steady-state problems, as well as transient heat transfer problems. The purpose of this paper is to test the efficacy of the PIES method with time discretization in solving problem of laser heating of a material, with different pulse shape approximation functions.

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Modelling of temperature evolution on metals during laser hardening process

Cited by 47 publications

References 14 publications

Comparative study of surface structuring of biometals by UV nanosecond Nd:YVO4 laser

Comparative study of surface structuring of biometals by UV nanosecond Nd:YVO4 laser

Modelización y monitorización de procesos de refusión láser de recubrimientos depositados por plasma

Parametric Integral Equations Systems Method In Solving Unsteady Heat Transfer Problems For Laser Heated Materials

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