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3 1998

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Internal variable model applied to the prediction of grain size during thermomechanical processing of C-Mn steel.

Pietrzyk M., Hodgson P.D.

Inżynieria Materiałowa

1998

R. XIX, nr 4

645-650

The objective of the work is a development of the internal variable model of grain size changes during hot plastic deformation and implementation of this model into finite-element thermal-mechanical-microstructural programs. Constants in the model are evaluated using the inverse technique and experimental data obtained in plastometric tests. The cost function in this technique is composed of the vector of differences between measured and calculated values of stress, fractional softening and grain size. The general concept of the approach assumes that a number of new grains per old grain after a cycle of recrystallization is included as a varying parameter in the inverse analysis. This enhanced description of the grain size improved the simulation of the multi-stage deformations, where the slope of stress strain curve and kinetics of recrystallization after reloading are very sensitive on the grain size.

Determination of carbon and nitrogen in rolled ferritic steel sheets.

Magalas L.B., Malinowski T., Rubianes J., Fantozzi G.

Inżynieria Materiałowa

1998

R. XIX, nr 3

356-359

This paper reports texture induced anisotropy of the carbon and nitrogen Snoek relaxation measured in a commercial carbon-manganese rolled steel. This phenomenon strongly influences determination of the concentration of C and N atoms dissolved in ferritic steel sheets. The relationship between the height of the Snoek peak and the concentration of foreign interstitial atoms (FIAs) in bcc single crystal is therefore reconsidered in the case of polycrystalline rolled steels. Anisotropy effect is observed in rolled steel sheets as well as in sheets subjected to various heat treatment. In all investigated cases the Snoek peak observed in samples cut at the angle of 45 degrees to the rolling direction (RD) is higher by around 45% than for perpendicularly or transversely cut specimens. Hence this effect is general. Strong anisotropy of the Snoek relaxation in rolled samples is explained by sensivity of the so-called Snoek orientation factor Gamma to texture components determined by the three-dimensional orientation distribution function ODF.

Decomposition of austenite formed at the temperature range of A3-A1 in A 0.2C-1.5Mn-1.5Si steel during isothermal annealing at 350-420 degrees centigrade.

Pietrzyk J., Osuch W., Kruk A., Michta G.

Inżynieria Materiałowa

1998

R. XIX, nr 3

307-314

The present study has been undertaken in order to examine the kinetics of the isothermal transformation of the austenitic region at temperature range of 350-420 degrees centigrade in low carbon silicon manganese steel after annealing in two-phase region (A1-A2). Carefully designed control-cooling and isothermal bainite transformation allows to obtain a multiphase steel containing retained austenite (8-12%) susceptible to transformation - induced plasticity (TRIP effect). Mechanical properties and microstructural studies of steel after various stages of isothermal transformation were performed.