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Iranian researchers from Sahand University of Technology in association with researchers from National Centre for Metallurgical Research in Madrid, Spain, studied the microstructural changes of a specific type of nanostructured bainitic steel at low temperature and succeeded in the thermal stabilization of the steel during low temperature thermal operation.
Microstructure stability is very important in low temperature nanostructured bainitic steel to identify its applicable limitations and to resolve them. Microstructure stability in this group of industrial alloys can be investigated in two mechanical and thermal aspects. The microstructure of nanostructured bainitic steel is thermodynamically instable due to its nature and bainitic evolution mechanism. Therefore, the importance of the subject becomes sensible when the mentioned steel is used at a specific range of temperature for a long time.
It is necessary to predict changes in the microstructure at operational temperature because these microstructure changes affect mechanical properties and their performance.
Unique mechanical properties of this type of steel are directly affected by the nanometric microstructure. That is why the present study is important. The prediction and control of mechanical properties can be possible by controlling the microstructure during the changes in parameters such as temperature and time. The aim of the present study was to study microstructure changes in a specific type of bainitic steel under the title low temperature nanostructured bainitic steel during austempering operation at low temperature (in the range of bainitic evolution) and in long time. Promising results were obtained in this research.
Generally speaking, low temperature nanostructured bainitic steel has various applications in different military industries, car-manufacturing, railways industries, etc due to its very desirable combination of strength and flexibility properties. This research will play an important role in the development of steel and its applications.
Latest results of the research have been published in Material Characterization, vol. 81, July 2013, pp. 105-110.
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