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The use of vanadium, as microalloying element in HSLA steels, is studied, and the results are compared to Nb and Ti steels.
It is shown that hot rolling is performed without any additional effort (rolling load) compared to C-Mn steels. This is the consequence of complete recrystallisation during interpass due to the lack of strain induced precipitation. This results in a larger grain size.
In microalloyed steels, precipitation is effective during phase transformation (from austenite to ferrite). Interphase precipitation depends on cooling rate. In Nb steels, coherent precipitation has been found very fast at high temperature in the ferrite. Complete precipitation is obtained in less than 10 s at 800 C.
Coiling temperature has a larger influence when high cooling rate is used on the runout table after rolling. In that condition, the precipitates are formed in the coiler, and the final precipitation hardening depends on the coiling temperature.
Precipitation hardening is detrimental for toughness. A higher balance between resistance and toughness has been obtained using high speed cooling and low coiling temperature (around 400 C) in view to keep the microalloying element in solution, and to avoid precipitation hardening. ng.

Additional information

Authors: LEROY V, Centre de Recherches Métallurgiques, Liège (BE);HERMAN J, Centre de Recherches Métallurgiques, Liège (BE)
Bibliographic Reference: EUR 15748 FR (1996) 48pp., FS, ECU 8.50
Availability: Available from the (2)
ISBN: ISBN 92-827-6517-2
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