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THE STUDY OF KINETIC RECRYSTALLIZATION OF HOT FORMED AUSTENITIC Ti STABILIZED STAINLESS STEEL

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Author(s): Jana Sobotová

Journal: Materials Engineering
ISSN 1335-0803

Volume: 16;
Issue: 4;
Start page: 15;
Date: 2009;
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Keywords: Recrystallization | Austenitic stainless steel | Plastimetric tests | Upsetting tests

ABSTRACT
The paper deals with the study of recrystallization of hot formed austenitic Ti-stabilized stainless steel X6CrNiTi18-10. Kinetic recrystallization was studied in the selected material by means of plastometric and upsetting tests. The effect of the strain temperature was studied in the temperature range 900-1250°C by plastometric tests. A drop hammer was used for the upsetting tests in the deformation temperature 1200°C. The height reduction in the tests was determined in a way that made it possible to compare specimens formed both by plastimetry and upsetting. Recrystallization was evaluated in the paper on the basis of stress-strain analysis, metallography (recrystallized fraction, grain size), hardness measurements (HV10), calculation of dehardening from values of hardness measurements and x-ray analysis (volume fraction of mosaic blocks larger than 10 µm). Parameter Z was determined for all conditions of strain, value of the activation energy of the tested material Q = 415 kJ/mol was used for the calculations. The monitored characteristics were compared after forming on a plastometer and upsetting at comparable strain intensity.
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