Dynamic Transformation of a Low Carbon Steel at Temperatures above the Ae_3

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概要

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• The dynamic transformation of austenite was studied in a 0.06%C low carbon steel by deforming to strains of 0.25–5.0 at strain rates of 0.04 and 0.4 s–1 over the temperature range 877–917°C. All these temperatures are at or above the conventional Ae3. Two critical strains were detected, the first (about ε=0.2) was for the formation of strain-induced ferrite; the second (about ε=1.5) was the critical strain for the reverse transformation, which was gradual and only observed in specimens deformed at the lower strain rate. After deformation, the strain-induced ferrite was stable for about 60 s of isothermal holding. However, after this time, the reverse transformation began to take place, approaching saturation in about 240 s. The influence of strain, strain rate and temperature on the dynamic transformation is described. The results indicate that reverse transformation is unlikely to take place in the finishing stands of strip mills due to the high strain rates and short interpass times involved. It is also suggested that conventional phase diagrams do not apply to austenite undergoing deformation in rolling mills.

• 2011-04-15

著者

• Jonas John

  Department Of Materials Engineering Mcgill University

• Basabe Vladimir

  Department Of Metals And Materials Engineering Mcgill University

• MAHJOUBI Hesameddin

  Department of Metals and Materials Engineering, McGill University

• Mahjoubi Hesameddin

  Department Of Metals And Materials Engineering Mcgill University

• Basabe Vladimir

  Department of Materials Engineering, McGill University

関連論文

• The Dynamic, Static and Metadynamic Recrystallization of a Nb-microalloyed Steel
• Effect of Chromium, Boron and Manganese Additions on the Deformation and Recrystallization Textures of Warm Rolled Low Carbon Steels
• The Deformation Microstructure and Recrystallization Behavior of Warm Rolled Steels
• Effect of alloying elements on the microstructure and texture of warm rolled steels
• Correlation between the Deformation and Post-deformation Softening Behaviours in Hot Worked Austenite
• Effect of Processing Schedule on the Microstructure and Texture of 0.78wt% Cr Extra-low-carbon Steel
• The Formation of Deformatio Induced Ferrite during Mechanical Testing
• Predicting the Critical Stress for Initiation of Dynamic Recrystallization
• Softening and Flow Stress Behaviour of Nb Microalloyed Steels during Hot Rolling Simulation
• Effect of Microstructure on the Cold Headability of a Medium Carbon Steel
• The Ferrite Transformation in Hot Deformed 0.036% Nb Austenite at Temperatures Above the Ae_3
• AIN Precipitation in Dual-phase 3% Si Electrical Steels
• The Hot Strip Mill as an Experimental Tool
• Effect of Finishing Temperature on Hot Band Textures in an IF Steel
• Effect of Silicon on the Kinetics of Nb(C, N)Precipitation during the Hot Working of Nb-bearing Steels
• Growth Rate and Phase Composition of Oxide Scales during Hot Rolling of Low Carbon Steel
• Effect of O_2 in Heating Atmosphere on Hydraulic Descaling in Hot Rolling of Low Carbon Steel
• Dynamic Transformation of a Low Carbon Steel at Temperatures above the Ae_3
• The Critical Strain for Dynamic Transformation in Hot Deformed Austenite
• Dynamic Transformation Behavior of a Deformed High Carbon Steel at Temperatures Above the Ae3
• The Critical Strain for Dynamic Transformation in Hot Deformed Austenite

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