Influence of rolling on the hardness of carbon steel after quenching
DOI:
https://doi.org/10.31498/2225-6733.28.2014.33553Keywords:
density of dislocations, distortions of the second kind, size of coherent dispersion, tetragonal character of crystalline grateAbstract
The microstructure and phase elements distribution in Mg-modified complex-alloyed white cast iron (3.3 % C, 5.3 %V, 4.6 % Cr, 4.1 % Mn, 1.5 % Ni) are studied in present work. The investigation was carried out using metallographic and energy-dispersive spectroscopy analyzes. In as-cast condition the cast iron contains spheroidal carbides MeC (3 vol. %) and two types of carbide eutectics based on Ме7С3 and Ме3С carbides respectively (with total volume fraction is 22.4 vol. %). The matrix consists of troostite (44.6 vol. %) and martensite-austenite (30.0 vol. %) areas. It is found that nickel and silicon is almost entirely concentrated in the matrix. Vanadium primarily dissolved in carbides (in spheroidal and eutectics both), the concentration of vanadium in the solid solution does not exceed 1 %. Chromium and manganese are distributed in a metallic matrix and carbides, a greater segregation in the latter. It is shown that vanadium and chromium can replace each other in carbides MeC and Ме7С3: the concentration of chromium in vanadium carbides is 4.41 %, the vanadium content in chromium carbides is 9.83 %. The dissolution of approximately 10 % V in Ме7С3 carbides causes that the inverted eutectic “austenite+Ме7С3” was crystallized even at low total Cr content in cast iron
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