caa a22 4500 463230310 CHVBK 20180405153240.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s10853-006-1275-1 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1275-1 Kinetics, mechanism and modelling of microstructural evolution during thermomechanical processing of a 15Cr-15Ni-2.2Mo-Ti modified austenitic stainless steel [Elektronische Daten] [Sumantra Mandal, P. Sivaprasad, R. Dube] The paper discusses the kinetics, mechanism and modelling of the microstructural evolution of a 15Cr-15Ni-2.2Mo-0.3Ti modified austenitic stainless steel (alloy D9) during dynamic recrystallization (DRX). The experimental methodology included different hot working operations employing industrial equipment such as forge hammer, hydraulic press and rolling carried out in the temperature range 1,173-1,473K to various strain levels. The kinetics of DRX has been investigated employing modified Johnson-Mehl-Avrami-Kolmogorov (JMAK) model. It has been found that the value of Avrami exponent varies in a close range of 1.17-1.34 which implies that D9 exhibits growth controlled DRX. Optical metallography has revealed that nucleation of DRX grains occurred along the prior grain boundaries by bulging mechanism. Microstructural characterization has shown that a significant correlation between microstructural features and processing parameters exists. However, this interrelation is ambiguous and fuzzy in nature. Therefore an artificial neural network model has been developed to predict the microstructural features, namely fraction of DRX and grain size, at different processing conditions. A good correlation between experimental findings and predicted results has been obtained. An instantaneous microstructure, therefore, can be designed in order to optimize the process parameters based on microstructural evolution. Springer Science+Business Media, LLC, 2007 Mandal Sumantra Materials Technology Division, Indira Gandhi Centre for Atomic Research, 603102, Kalpakkam, Tamilnadu, India aut Sivaprasad P. Materials Technology Division, Indira Gandhi Centre for Atomic Research, 603102, Kalpakkam, Tamilnadu, India aut Dube R. Department of Materials and Metallurgical Engineering, IIT Kanpur, 208016, Kanpur, UP, India aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/8(2007-04-01), 2724-2734 0022-2461 42:8<2724 2007 42 10853 https://doi.org/10.1007/s10853-006-1275-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1275-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mandal Sumantra Materials Technology Division, Indira Gandhi Centre for Atomic Research, 603102, Kalpakkam, Tamilnadu, India aut NATIONALLICENCE 700 1- Sivaprasad P. Materials Technology Division, Indira Gandhi Centre for Atomic Research, 603102, Kalpakkam, Tamilnadu, India aut NATIONALLICENCE 700 1- Dube R. Department of Materials and Metallurgical Engineering, IIT Kanpur, 208016, Kanpur, UP, India aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/8(2007-04-01), 2724-2734 0022-2461 42:8<2724 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer