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Precipitation Upon Hot Strip Mill Conditions of a Ti-IF Steel

Published online by Cambridge University Press:  02 July 2020

W. Regone ,
A. M. 𝚓orge JĂșnior  and
O. Balancin
W. Regone
Affiliation:
Universidade Federal de SĂŁo Carlos - Departamento de Engenharia de Materiais Via Washington Luiz, km 235- , SĂŁo Carlos- , SĂŁo Paulo - CEP: 13565-905
A. M. 𝚓orge JĂșnior
Affiliation:
Universidade Federal de SĂŁo Carlos - Departamento de Engenharia de Materiais Via Washington Luiz, km 235- , SĂŁo Carlos- , SĂŁo Paulo - CEP: 13565-905
O. Balancin
Affiliation:
Universidade Federal de SĂŁo Carlos - Departamento de Engenharia de Materiais Via Washington Luiz, km 235- , SĂŁo Carlos- , SĂŁo Paulo - CEP: 13565-905
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Abstract

Upon hot strip mill of titanium Interstitial Free (IF) steels, during cooling from austenite to ferrite region, the level of interstitial elements not removed by steelmaking process is dropped down by Ti that combines with N, C and S. Some authors [1-3] have reported that the traditional precipitation sequence TiN, TiS, Ti4C2S2 and TiC occurs with freestanding particles formed by nucleation and growth processes. Other authors [4] have indicated that the transformation from TiS to Ti4C2S2 may be considered as a hybrid of shear and diffusion, i.e., faulted Ti8S9 (9R) + 10[Ti] + 9[C] → 41/2Ti4C2S2 (or H for its hexagonal crystal structure). At low temperature (≀930°C), the stabilization process continues through epitaxial growth of carbides on H phase. to study the evolution of precipitation upon hot strip mill conditions, samples of a Ti - IF steel were subjected to double straining tests [5] by means of a computerized hot torsion machine, at 1000 °C and 920 °C, with strain rate of 1 s-1 and interpass times ranging from 0.5 to 100 s.

Type
Microscopy in the Real World: Semiconductors and Materials
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 508 - 509
Copyright
Copyright © Microscopy Society of America 2001

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References

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