Actual Problems in Machine Building. Vol. 12. N 1-2. 2025 Materials Science in Machine Building ____________________________________________________________________ 62 FINE STRUCTURE OF THE HEAT-AFFECTED ZONE FORMED BY PULSE ARC SURFACING OF ALLOY STEEL ON HIGH-CARBON STEEL Nikulina A.A., D.Sc. (Engineering), Associate Professor, e-mail: a.nikulina@corp.nstu.ru Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation Abstract The paper examines the microstructural features of the heat-affected zone formed during pulsed arc surfacing of dissimilar steels — high-carbon steel and chromium-nickel steel. The study employed methods of optical microscopy, scanning electron microscopy, and transmission electron microscopy, as well as micro-X-ray spectral analysis. Microstructural investigations revealed that the heat-affected zone exhibits a fine-grained structure compared to the original carbon steel due to rapid heat dissipation. In the ferrite-pearlite region of the heat-affected zone, the minimum thickness of cementite lamellae in pearlite is 20…30 nm, and the interlamellar spacing is 100 nm. Partial spheroidization of cementite is observed. Keywords Microstructure, dissimilar steels, pulsed arc surfacing, heat-affected zone, cementite.
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