Phase and Structural Transformations of Welds in Metal upon High-Velocity Impact
T. I. Tabatchikova†, A. N. Morozov, N. A. Tereshchenko
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Ekaterinburg, 620137 Russia
Keywords: сталь, сварной шов, высокоскоростной удар, метастабильный аустенит, мартенсит, микротвердость, рентгенографические исследования, микроиндентирование, steel, weld, high-velocity impact, metastable austenite, martensite, microhardness, X-ray studies, microindentation
Abstract
The change in the structure of welds obtained using a new welding wire and subjected to high-velocity impact was investigated by optical and scanning electron microscopy and X-ray diffraction analysis. It is shown that after welding, a structure of martensite, ferrite, and a metastable austenite is formed in the weld metal. Subsequent intense exposure leads to hardening of the weld metal due to the transformation of metastable austenite into strain-induced martensite. Kinetic microindentation of the welds was performed.
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