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By T. Ericsson

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Read or Download Computers in Materials Technology. Proceedings of the International Conference Held at the Institute of Technology, Linköping University, Sweden, June 4–5, 1980 PDF

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Additional resources for Computers in Materials Technology. Proceedings of the International Conference Held at the Institute of Technology, Linköping University, Sweden, June 4–5, 1980

Sample text

The martensite transformation is treated in the manner proposed by koistinen and Marburger in 1959 [ 2 ] . They showed that in contrast to the transformations treated above the martensite transformation is governed by the instantaneous temperature, not a time-temperature history. The calculations are made by a computer program, whose organization is shown schematically in the flow chart of Fig 4. CIMT e 56 Start a thermal expansion coefficient Temp. cale. * Cale, of phase* composition Need temperatures be recale, due to changed phase comp?

An induction coil. The boundary conditions are |± = 0 Xl Ws for r=0 = Q( V for r = r s (2) (3) where subscript s stands for the surface. Q(T ) defines the heat transport through the surface as a function or the temperature on the surface. It depends on cooling medium and agitation. The austenite decomposition at a certain location is calculated by dividing the temperature - time curve into small time steps. For each step the increment of transformation is evaluated from the IT-diagram of the steel by a technique described by Tzitzelkov (5).

The final stress state depends on the sequence of the transformations. The transformation behaviour of a steel is normally represented by the isothermal transformation (IT) diagram and the continous cooling transformation (CCT) diagram. Useful is also the Jominy diagram and empirical equations (1). The transformation diagrams must all be used with caution as they are valid for very specific cooling conditions 45 46 only. This is illustrated by fig. 1 where three different sets of cooling curves simulate water, oil and air quenching for a Cr-Mo steel (2).

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