Effect of Initial Processing on the Microstructure-Property Relationships in Bake-Hardened C-Mn-Si TRIP Steels

Ilana B. Timokhina; Elena V. Pereloma; Peter Hodgson

doi:10.4028/www.scientific.net/MSF.539-543.4315

Paper Titles

Methods of Tinplate Imperfection Analyses
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Role of Manganese and Chromium on the Segregation Kinetics of Carbon and Nitrogen to the Dislocations in Ferritic Steels
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Microstructure and Mechanical Properties of Ausformed Ultra High-Strength TRIP-Aided Steels
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Effect of Initial Processing on the Microstructure-Property Relationships in Bake-Hardened C-Mn-Si TRIP Steels
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Size Distribution of Retained Austenite in Phosphorus-Containing TRIP Steels
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Low-Carbon Manganese TRIP Steels
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On the Phase Transformations in Hot Rolled TRIP-Assisted Multiphase Steels
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Modelling the Transformations Kinetics from Work-Hardened Austenite in a TRIP Steel
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HomeMaterials Science ForumMaterials Science Forum Vols. 539-543Effect of Initial Processing on the...

Effect of Initial Processing on the Microstructure-Property Relationships in Bake-Hardened C-Mn-Si TRIP Steels

Abstract:

The effect of pre-straining (PS) and bake-hardening (BH) on the microstructure and mechanical properties has been studied in C-Mn-Si TRansformation Induced Plasticity (TRIP) steels after: (i) thermomechanically processing (TMP) and (ii) intercritical annealing. The steels were characterised before and after PS/BH by transmission electron microscopy (TEM), X-ray diffraction (XRD), and tensile tests. The main microstructural differences were the higher volume fraction of bainite and more stable retained austenite in the TMP steel. This led to a difference in the strain-hardening behavior before and after BH treatment. The higher dislocation density in ferrite and formation of microbands in the TMP steel after PS and the formation of Fe3C carbides between the bainitic ferrite laths during BH for both steels also affected the strain-hardening behavior. However, both steels after PS/BH treatment demonstrated an increase in the yield and tensile strength.

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Materials Science Forum (Volumes 539-543)

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4315-4320

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https://doi.org/10.4028/www.scientific.net/MSF.539-543.4315

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Online since:

March 2007

Authors:

Ilana B. Timokhina, Elena V. Pereloma, Peter Hodgson

Keywords:

Bake-Hardening, Pre-Strain, Retained Austenite, TRIP Steel

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