In this work the effect of the temperature on the growth of the shortness cracks and consequently on the mechanical properties of a 20Mn4 steel was studied. Uniaxial tensile tests were carried out on thermo-mechanical simulator Gleeble 3800TM in a range of temperatures between 1000° and 1280°C. Heat treatments at different temperatures and holding times were carried out in a tubular furnace. After tensile test and heat treatments, the samples were characterised by SEM in order to evaluate the effect of microstructural evolution on the hot shortness behaviour. The copper agglomeration at the metal/scale interface is the main responsible of the hot shortness: for a characteristic range of temperature, a liquid copper enriched phase penetrates along grain boundaries promoting crack formation and hot shortness behaviour.
Evaluation of the critical conditions for the hot shortness cracks formation in a 20Mn4 steel
BRUNELLI, KATYA;BRUSCHI, STEFANIA;GHIOTTI, ANDREA;DABALA', MANUELE
2012
Abstract
In this work the effect of the temperature on the growth of the shortness cracks and consequently on the mechanical properties of a 20Mn4 steel was studied. Uniaxial tensile tests were carried out on thermo-mechanical simulator Gleeble 3800TM in a range of temperatures between 1000° and 1280°C. Heat treatments at different temperatures and holding times were carried out in a tubular furnace. After tensile test and heat treatments, the samples were characterised by SEM in order to evaluate the effect of microstructural evolution on the hot shortness behaviour. The copper agglomeration at the metal/scale interface is the main responsible of the hot shortness: for a characteristic range of temperature, a liquid copper enriched phase penetrates along grain boundaries promoting crack formation and hot shortness behaviour.Pubblicazioni consigliate
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