%0 Journal Article %A Uglov, Vladimir V. %A Anishchik, V. M. %A Astashynski, V. V. %A Rumiantseva, Iryna N. %D 2004 %I Begell House %N 2 %P 233-243 %R 10.1615/HighTempMatProc.v8.i2.80 %T STRUCTURE OF SURFACE LAYERS OF IRON AND CARBON STEELS TREATED BY COMPRESSION PLASMA FLOWS %U https://www.dl.begellhouse.com/journals/57d172397126f956,6c962d843dc35b18,1bd1cd4c5ac86d31.html %V 8 %X Investigation on a surface structure of carbon steel (0.025-0.8 wt.% C) modified by the action of compression plasma flows, and determination of element and phase composition were carried out using X-ray diffraction analysis, Auger-electron spectroscopy, optical microscopy and scanning electron microscopy, along with studies on mechanical properties of the material. As a result of plasma action, the cellular structure composed of polygonal cells and the modified layer by thickness of tens micrometers immediately adjacent to a sample surface are formed. Its phase structure represents a superposition of following phases: ferrite, martensite, austenite (C, N), and e nitride phase. Concentration of nitrogen in the surface layer reaches 15-20 atomic percents. The final structure of near-surface area in the processed samples is formed from ε-domain due to eutectoid decomposition on cooling. %8 2004-06-01