Dynamic Softening of Flow Stress during Dynamic Ferrite Transformation

Nokeun Park; Sunisa Khamsuk; Akinobu Shibata; Nobuhiro Tsuji

doi:10.4028/www.scientific.net/MSF.753.510

Paper Titles

Texture Formation in AZ91 Magnesium Alloy during High-Temperature Uniaxial Compression
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Texture Formation in AA5182 Aluminum Alloy by Hot Extrusion
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Effect of Fine Grain on Mechanical Properties of A6N01 Alloy
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Solid Phase Growth of some Metal and Metal Oxide Thin Films on Sapphire and Quartz Glass Substrates
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Dynamic Softening of Flow Stress during Dynamic Ferrite Transformation
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Ferrite Grain Coarsening from Hot Rolled Austenite in ODS Steels
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Nanocrystalline Twinning Induced Plasticity Steel with Superior Mechanical Properties Fabricated by Cold Rolling and Annealing
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Effect of Inter-Pass Ageing during Cold Rolling on Magnetic Properties of Fe-3%Si
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Development of Very Tough Ferritic Stainless Steels by Optimizing the Recrystallized Microstructure
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HomeMaterials Science ForumMaterials Science Forum Vol. 753Dynamic Softening of Flow Stress during Dynamic...

Dynamic Softening of Flow Stress during Dynamic Ferrite Transformation

Abstract:

This study using a 6Ni-0.1C steel confirmed the relationship between the change in a fraction of dynamically transformed ferrite and the dynamic softening in stress-strain curve during dynamic transformation above ortho-equilibrium austenite-to-ferrite transformation temperature. Dynamic softening in stress-strain curve was well-fitted with a form of Avrami equation as a function of strain, and it corresponded with the change in fraction of ferrite. The slope of work-hardening rate was increased due to the additional softening phenomenon, i.e. dynamic transformation, to dynamic recovery of austenite. Dynamic softening of austenite, which has been considered as a typical evidence of dynamic recrystallization, could be interpreted as a response of dynamic transformation to ferrite.