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Effect of initial processing on the microstructure-property relationships in bake-hardened C-Mn-Si trip steels

Conference Paper


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.

Publication Date


  • 2007

Citation


  • Timokhina, I. B., Pereloma, E. V., & Hodgson, P. D. (2007). Effect of initial processing on the microstructure-property relationships in bake-hardened C-Mn-Si trip steels. In Materials Science Forum Vol. 539-543 (pp. 4315-4320). doi:10.4028/0-87849-428-6.4315

Scopus Eid


  • 2-s2.0-38349030868

Web Of Science Accession Number


Start Page


  • 4315

End Page


  • 4320

Volume


  • 539-543

Issue


  • PART 5

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.

Publication Date


  • 2007

Citation


  • Timokhina, I. B., Pereloma, E. V., & Hodgson, P. D. (2007). Effect of initial processing on the microstructure-property relationships in bake-hardened C-Mn-Si trip steels. In Materials Science Forum Vol. 539-543 (pp. 4315-4320). doi:10.4028/0-87849-428-6.4315

Scopus Eid


  • 2-s2.0-38349030868

Web Of Science Accession Number


Start Page


  • 4315

End Page


  • 4320

Volume


  • 539-543

Issue


  • PART 5