Hot Deformation Characteristics of Si-Mn TRIP Steels with and without Nb Microalloy Additions

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概要

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• It has been long recognized that steels with high formability and strength can be produced with the aid of the deformation induced transformation of retained austenite to martensite. Selecting the steel composition and microstructure to obtain significant amounts of retained austenite has been the first step in designing TRIP steels. Thus, it is now well established that a significant amount of retained austenite can be obtained in steels containing high concentrations (>1%) of Si, where bainite is one of the main microconstituents. The effects of different intercritical annealing conditions on various aspects of Si-Mn TRIP steels have been extensively studied in other investigations. The present work was, however, conducted to investigate the influence of thermomechanical processing on the general behaviour of two Si-Mn TRIP steels, including a microalloyed Nb-bearing grade. The effects of microstructural features produced by dynamic recrystallization and pancaking of austenite, along with that of finishing temperature below tha <I>T<SUB>nr</SUB></I> (the austenite no-recrystallization temperature) on the subsequent transformations of the parent austenite, and the state of retained austenite at room temperature, were examined. It was found that, for microstructures comprised of polygonal ferrite, bainite and retained austenite, the variation of the retained austenite volume fraction with strain in the no-recrystallization region exhibits a maximum. Furthermore, the dynamically recrystallized austenite substructure, when retained to transformation temperatures, tends to retain more austenite.

• 社団法人 日本鉄鋼協会の論文
• 1995-03-15

著者

• Hodgson P

  Deakin Univ. Vic. Aus

• HODGSON P.

  School of Engineering and Technology, Deakin University

• Yue S

  Mcgill University Department Of Mining Metals And Materials Engineering

• YUE S.

  Department of Mining and Metallurgical Engineering, McGill University

• HODGSON P.

  BHP Research-Melbourne Laboratories

• Hodgson P.

  Bhp Research Melbourne Laboratories

• HANZAKI A.

  Department of Mining and Metallurgical Engineering, McGill University

• Hanzaki A.

  Department Of Mining And Metallurgical Engineering Mcgill University

• Yue S.

  Department Of Metallurgical Engineering Mcgill University

関連論文

• Modelling the Effect of Carbon Content on Hot Strength of Steels Using a Modified Artificial Neural Network
• Ultrafine Grained Ferrite Formed by Interrupted Hot Torsion Deformation of Plain Carbon Steel
• The Effect of Chemistry on the Formation of Ultrafine Ferrite in Steel
• The Effect of Thermal History on the Hot Ductility of Microalloyed Steels
• Effect of Thermomechanical Processing on the Hot Ductility of a Nb-Ti Microalloyed Steel
• Modelling the Thermomechanical and Microstructural Evolution During Rolling of a Nb HSLA Steel
• Hot Deformation Characteristics of Si-Mn TRIP Steels with and without Nb Microalloy Additions
• Continuous Cooling Transformation Temperature and Microstructures of Microalloyed Hypereutectoid Steels
• Kinetics of metadynamic recrystallization in microalloyed hypereutectoid steels
• Metadynamic and Static Recrystallization of Hypereutectoid Steel
• The Static and Metadynamic Recrystallization Behaviour of an X60 Nb Microalloyed Steel
• Spreadsheet Modelling of Grain Size Evolution during Rod Rolling
• The Influence of Bainite on Retained Austenite Characteristics in Si-Mn TRIP Steels
• The Kinetics of Static Recrystallization in Microalloyed Hypereutectoid Steels
• The Influence of Martensite on Line Broadening in Neutron Diffraction Spectra of a DP Steel
• The Application of Constitutive and Artificial Neural Network Models to Predict the Hot Strength of Steels
• Static Recrystallization of Nb and Nb-B Steels under Continuous Cooling Conditions
• Dynamic Recrystallization Behavior in Hypereutectoid Steels with Different Carbon Content
• Ferrite Formation Characteristics in Si-Mn TRIP Steels

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