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INFLUENCE OF THE STRUCTURE SUCCESSION ON THE VOLUME FRACTION OF MARTENSITE AND FERRITE MICROHARDNESS IN A DUAL-PHASE STEEL WITH LOW MANGANESE CONTENT
Abstract
The article presents results of the studies conducted by the authors for determining the influence of the structure succession on the volume fraction of martensite and ferrite microhardness in a dual-phase steel with low manganese content. For the research in discussion, an alloy with 0.094% C and 0.53% Mn (Si, Cr, Ni, Mo, Al, Cu, P, and S below 0.1%) was used. This alloy was subjected to several cycles of heat treatments (consisting of full annealing, normalizing, subcritical annealing, full quenching, intercritical quenching). The metallographic analyzes were performed with a LEXT OLS4100 Laser Microscope, (Olympus Corporation, Japan) and OLYMPUS Stream MOTION Image Analysis Software. The ferrite microhardness was determined with a MicroHardness Tester DuraScan 70 (Emco Prufmaschinen-Test GmbH, Austria), the test load of the Vickers indenter being 0.098 N (0.01 kgf). The full annealing, the normalizing, the cycle made up of normalizing and subcritical annealing led to obtaining ferrite-pearlite structures with different structural aspects and with different percentages of ferrite and pearlite, while the full quenching caused the formation of martensite and a small volume fraction of residual austenite. The intercritical quenching, which ended the cycles of the heat treatments, ensured the obtaining of ferrite-martensite structures specific to dual-phase steels. In this structures, the volume fraction of martensite (VM) was (depending on the cycle of the heat treatments) between 17.44 and 26.16%; this volume fraction, as well as the shape, size and distribution of the martensite were influenced by the heat treatments prior to the intercritical quenching. The ferrite microhardness was also influenced by the applied cycle of the heat treatments, the value being between 177.91 and 183.69 HV.
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References12
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