Elasto-plastické chování pokročilé ADI litiny studované pomocí in-situ SEM tahové zkoušky

ELASTIC-PLASTIC BEHAVIOUR OF ADVANCED ADI STUDIED BY IN-SITU SEM TENSILE TEST

conference paper

en

In-situ SEM tensile tests at room temperature have been performed on flat specimen of advanced austempered ductile cast iron (ADI) alloyed with nickel with the aim to study elastic-plastic behavior together with the nucleation and growth of cracks. During tensile loading the systematic observation of selected locations was studied. The in-situ observation was used to elucidate the tensile curves in agreement with the deformation mechanisms. In the early stage of loading the stress-strain response is elastic. After exceeding elastic limit decohesion of graphite nodules from the matrix was observed. It can be related to the departure of the tensile curve from the elastic behavior. The cracks initiated preferably from interface of graphite nodule and the ausferrite matrix. Elastic-plastic region is connected with the plastic deformation of the matrix and growth and linking of short cracks. The tensile curves from in-situ stage and standard tensile test were compared and discussed.

Test in-situ SEM tahových zkoušek prováděný při pokojové teplotě na plochých vzorcích z tvárné litiny legované niklem. Na těchto vzorcích bylo studováno pružno-plastické chování spolu s nukleací a růstem trhliny.

In-situ SEM tensile tests at room temperature have been performed on flat specimen of advanced austempered ductile cast iron (ADI) alloyed with nickel with the aim to study elastic-plastic behavior together with the nucleation and growth of cracks. During tensile loading the systematic observation of selected locations was studied. The in-situ observation was used to elucidate the tensile curves in agreement with the deformation mechanisms. In the early stage of loading the stress-strain response is elastic. After exceeding elastic limit decohesion of graphite nodules from the matrix was observed. It can be related to the departure of the tensile curve from the elastic behavior. The cracks initiated preferably from interface of graphite nodule and the ausferrite matrix. Elastic-plastic region is connected with the plastic deformation of the matrix and growth and linking of short cracks. The tensile curves from in-situ stage and standard tensile test were compared and discussed.

ADI legování niklem, in-situ tahová zkouška; mechanické vlastnosti, deformace mechanismy, SEM-FEG

ADI with nickel alloying, in-situ tensile test; mechanical properties, deformation mechanisms, SEM-FEG

2013

10.05.2013

TANGER Ltd.

Brno

978-80-87294-39-0

Metal 2013

676–681

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