City Research Online

Abstract

The hot ductility of B-Ti-Nb-high Al (1.5%Al) containing TWIP steels having Ti/N ratios mainly in excess of 3.4/1 was obtained. After soaking at 1250°C, the tensile specimens were cooled at 12 or 60°C min−1 to the test temperature and then strained to failure at 3 × 10−3 s−1. Ductility was always good (reduction of area >40%), independent of Ti/N ratio or cooling rate. The good ductility is due to B segregation strengthening the grain boundaries and the low S level (0.005%S) limiting the volume fraction of MnS inclusions and restricting AlN precipitation to the matrix. Increasing the cooling rate, higher N levels and Nb resulted in a small improvement in ductility. An addition of V to the Nb-containing steels caused a slight deterioration in the hot ductility.

Publication Type:	Article
Additional Information:	This is an Accepted Manuscript of an article published by Taylor & Francis in Materials Science and Technology on 14 April 2017, available online: https://doi.org/10.1080/02670836.2017.1309097.
Publisher Keywords:	TWIP steel, hot ductility, B, Ti, Al, N, Nb, V, MnS
Departments:	School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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