By T. Ericsson

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

Example text

Venugopalan, and J. S. V. Doane and J. S. ), Hardenability Concepts with Applications to Steel, AIME, 1978. 7. J. L. , 152 64 (1943). 8. R. H. Cobbett, Metal Progress,May 1977, p. 35. 9. G. , March 5, 1979, p. 17. 37 ON-LINE CONTROL OF CARBURIZATION ARBURIZATIONN RESPONSE AND KINETICS CASE DEPTH. CARBON AND HARDNESS ON-LINE CONTROL OF QUENCH AND TEMPER PROPERTIES MECHANICAL PROPERTIES. HARDNESS DISTRIBUTIONS OF | QUENCHED AND TEMPERED STEELS/ VARIOUS SHAPES ^WELDABILrnr COLD CRACKING PARAMETERS FOR VARIOUS CONSTRAINTS.

The temperature field is governed by the equation n n p C P 3T _ , 92Τ It - λ + κλ 8Τ , d\ 3T ^ 2 — 1Ξ + + 17 aï * * , (1) where λ is the thermal conductivity, C is the specific heat, p is the density, q is the heat generation rate inside the volume, T is the temperature and t is the time. Here λ, C and p are defined as functions of temperature and phase composition. Moreover, the density, p, is a function of the carbon content, κ is 0 for plates and 1 for cylinders. The heat generation, q, include the loss and gain in heat when phase transformation occur as well as the heat supplied of eg.

3 IT-diagram. (1) Transformation into ferrite, cementite, pearlite or bainite. A continuous cooling curve can be thought of as a series of small time segments, each with constant temperature, connected by instantaneous temperature changes. As the lines for constant volume fractions must be followed during the instantaneous temperature changes, such a path approximating a continuous cooling shown in Fig 3. The amounts of transformed phases are calculated for each segment of constant temperature from a formula presented by Avrami [1].

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Computers in Materials Technology. Proceedings of the by T. Ericsson
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