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An interesting seminar ...

16-03-2005

... by Prof. Dr. Graeme John Oliver from Cape Peninsula University of Technology, Cape Town, South Africa will be held Mar. 22nd, 3.00pm in room 215 WIM (Wołoska 141).

Te seminar will be devoted to:
DEVELOPING DEDICATED FINITE ELEMENT SOFTWARE FOR HEAT TREATMENT WITH MOVING HEAT SOURCES INCLUDING THE EFFECTS OF METALLURGICAL PHASE CHANGE

Abstract

There are a number of problems associated with surface heat treatments such as laser hardening and cladding which are difficult to solve by physical experimentation alone such as back tempering in overlapping tracks and insufficient thickness of the hardened layer. The finite element method is widely used to solve other engineering problems but commercially available software generally lacks the capability to model the metallurgical phase changes needed to solve this kind of problem.

A solution scheme to solve a fully coupled thermal, metallurgical and mechanical system using the finite element method was previously described by Ronda and Oliver. This was based on the solution of a transient thermal problem coupled with successive static mechanical solutions, which were both coupled to the time integration of a system of ordinary differential equations for modeling solid phase transformations. The current work focuses on developing a finite element package which contains the essential elements needed to solve problems in heat treatment or surface cladding using a moving heat source such as a CO2 or Yag laser or cladding systems based on arc welding or plasma spray.

Phase transformations are modeled to predict the volume fractions of austenite, ferrite, pearlite, bainite and martensite present in the material at a given instant in the heat treatment process. A simple graphical user interface, which acts as a guide as to the information that needs to be supplied to solve heat treatment problems as well as providing the output in the form of colour contours, is also developed as an essential element in making the solution of such problems more efficient.

The seminar language will be English.

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