Effect of Thermomechanical Processing on the Hot Ductility of a Nb-Ti Microalloyed Steel

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概要

• 論文の詳細を見る

• Many attempts have been made to understand the problem of transverse cracking in continuous casting process. Much of this research has involved the study of hot ductility using conventional isothermal hot ductility testing. In these tests, the specimens were isothermally tensile tested to fracture, at temperatures achieved by cooling from a solutionizing temperature, close to the solidus, or above the liquidus. These studies showed that hot ductility at the test temperature is highly depended on the thermal path followed by the specimens. The thermal histories experienced by strands during continuous casting were found to be quite complex and invariably involve rapid cooling and heating cycles. This may therefore lead to high thermal gradients, which, in turn, can generate strains in the surface of the solidifying strand. This then may alter the microstructural evolution of the strand surface and the corresponding hot ductility, a possibility that has not been addressed in any previous studies. Thus, the purpose of this study was to consider the effect of the thermomechanical history on the hot ductility of steel.After in-situ melting and solidification, Nb–Ti microalloyed tensile specimens were subjected to a thermal history typical of a continuously cast billet. Different degrees of deformation were imposed on the specimens at selected stages of this thermal history, before tensile testing to fracture point at the time and temperature corresponding to the unbending stage of the billet casting. It was found that the hot ductility varied from 1 to 98%, depending on the stage in the thermal history at which deformation was executed. The microstructural evolution during the thermomechanical profile was followed to study the effect of thermomechanical history on the hot ductility.

• 社団法人 日本鉄鋼協会の論文
• 2001-11-15

著者

• Yue S

  Mcgill University Department Of Mining Metals And Materials Engineering

• AKHLAGHI Siamak

  Formerly Ph.D. Student at the Department of Mining and Metallurgical Engineering, McGill University

• YUE Steve

  Department of Mining and Metallurgical Engineering, McGill University

• Yue Steve

  Department Of Metals And Materials Engineering Mcgill University

• Yue Steve

  Department Of Mining And Metallurgical Engineering Mcgill University

• Akhlaghi Siamak

  Formerly Ph.d. Student At The Department Of Mining And Metallurgical Engineering Mcgill University

関連論文

• Effect of Thermomechanical Processing on the Hot Ductility of a Nb-Ti Microalloyed 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
• Improvement of Hot Ductility in the Nb-microalloyed Steel by High Temperature Deformation
• Mechanism for Loss of Hot Ductility Due to Deformation during Solidification in Continuous Casting of Steel
• Effect of Microstructure on Static and Dynamic Mechanical Property of a Dual Phase Steel Studied by Shear Punch Testing
• The Effect of Boron on Hot Ductility of Nb-microalloyed Steels
• Impact Toughness and Tensile Properties Improvement through Microstructure Control in Hot Forged Nb-V Microalloyed Steel

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