A Fundamental Study of Laser Transformation Hardening View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1983-03

AUTHORS

Sindo Kou, D. K. Sun, Y. P. Le

ABSTRACT

A theoretical and experimental study of heat flow and solid-state phase transformations during the laser surface hardening of 1018 steel was conducted. In the theoretical part of the study, a three-dimensional heat flow model was developed using the finite difference method. The surface heat loss, the temperature dependence of the surface absorptivity, and the temperature dependence of thermal properties were considered. This heat flow model was verified with the analytical solution of Jaeger and was used to provide general heat flow information, based on the assumptions of no surface heat loss, constant surface absorptivity, and constant thermal properties. The validity of each of these three assumptions was evaluated with the help of this heat flow model. In the experimental part of the study, on the other hand, a continuous-wave CO2 laser of 15 kW capacity was used in conjunction with a beam integrator to surface harden 1018 steel plates. The beam power and the travel speed of the workpiece were varied, and the onset of surface melting was determined. The configurations of the heat-affected zone observed were compared with those calculated using the heat flow model. The microstructure of the heat-affected zone was explained with the help of the calculated peak temperature, heating, and cooling rates. More... »

PAGES

643-653

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02643780

DOI

http://dx.doi.org/10.1007/bf02643780

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1013156214


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