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STRUCTURAL CHANGES IN Cr-V LEDEBURITIC STEEL DURING AUSTENITIZING AND QUENCHING

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Author(s): Peter Jurči

Journal: Materials Engineering
ISSN 1335-0803

Volume: 17;
Issue: 1;
Start page: 1;
Date: 2010;
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Keywords: PM ledeburitic steel | Microstructure | Carbides | Matrix saturation | Martensite | Bainite

ABSTRACT
The Vanadis 6 PM Cr-V ledeburitic steel was austenitized at temperatures from the range 1000 – 1200 oC and nitrogen gas quenched. Structural changes were investigated by light microscopy and SEM. Obtained result fixed that the M7C3-carbides underwent a complete dissolution in the austenite while MC-phase remained almost completely unaffected. The saturation of the austenite by chromium and partly vanadium induced formation of increased portion of non-martensitic structural components after quenching, due to decrease of MS and Mf temperatures. Undissolved part of MC-carbides, located mainly on the grain boundaries, hinders effectively the grains coarsening also at higher austenitizing temperatures.

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