Abstract
A narrow temperature range of changes in the mechanism and kinetics of structural-phase transformations during mechanical alloying under deformation in rotating Bridgman anvils was determined by the methods of Mössbauer spectroscopy, electron microscopy, and mechanical tests in the high-nitrogen chromium-manganese steel FeMn22Cr18N0.83. The experimentally established temperature region is characterized by a change in the direction of nitrogen redistribution—from an increase in the N content in the metal matrix during cold deformation to a decrease with an increase in the temperature and degree of severe plastic deformation. The change in the direction of nitrogen redistribution is due to the acceleration of the decomposition of a nitrogen-supersaturated solid solution of austenite with the formation of secondary nanocrystalline nitrides. The presence of a transition region for the mechanism of structural-phase transitions is manifested in the abnormal behavior of the mechanical properties of steel.
Highlights
IntroductionHigh-nitrogen chromium-manganese austenitic steels have a number of favorable physical and chemical properties (corrosion resistance, tribological characteristics, etc.), which allow for offering these steels as new materials in mechanical engineering [1,2,3,4,5]
High-nitrogen chromium-manganese austenitic steels have a number of favorable physical and chemical properties, which allow for offering these steels as new materials in mechanical engineering [1,2,3,4,5]
We investigated the high-nitrogen chromium-manganese austenitic steel FeMn22Cr18N0.83 prepared by the technology of casting with nitrogen back pressure [2]
Summary
High-nitrogen chromium-manganese austenitic steels have a number of favorable physical and chemical properties (corrosion resistance, tribological characteristics, etc.), which allow for offering these steels as new materials in mechanical engineering [1,2,3,4,5]. The mechanical properties of nitride steels are largely determined by structural-phase transformations during various treatments [5,6,7]. This applies, first of all, to transformations in conditions of intense severe plastic deformation (SPD), such as impact and friction loading, extrusion, equal-channel angular pressing (ECAP), high pressure torsion (HPT), etc. An indirect confirmation for the formation of secondary nitrides in the austenite matrix can be presented by the transmission electron microscopy (TEM) data—on the formation of nanocrystalline nitrides—concerning high-nitrogen chromium-manganese steels under conditions of HPT deformation at room temperature and during processing in ball mills [9,10]
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