Influence of chemical composition and tempering treatment on toughness of bainitic 38MnV7 steel

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Defense date2012
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Abstract
This work studies the influence of Mn and the V/N ratio on the toughness
of 38MnV7 steel. Four steels with different Mn, N and
Ti contents were studied. Lowering the Mn content to approximately 1.5% considerably enhanced toughness by reducing Mn segregation
and consequently achieved a more uniform bainitic microstructure. Rais
ing the N content to reach a V/N ratio of close to 5 enhanced the
intragranular nucleation of bainite and thus also improved toughness. Isothermal transformation prevented the presence of retained
austenite and allowed a complete bainitic transformation. O
ne of the steels contained Ti to control austenite grain growth by the
precipitation of TiN particles. However, the results showed that the presence of
nanoparticles
TiN
did not improve the bainitic
microstructure. In sum, the work has allowed the obtainme
nt of a 38MnV7 steel with a toughness value (obtained in a Charpy V
-
Notch
impact test) of close to 40 J, and higher than 50 J after tempering at 600 ºC. The steel shows a toughness of close to 20 J at
-
40 ºC. The
optimal composition of the steel (in wt. %)
was approximately: C=0.38; Mn=1.53; V=0.11; N=0.0217
CitationRancel, Lucia [et al.]. Influence of chemical composition and tempering treatment on toughness of bainitic 38MnV7 steel. "Steel research international", 2012, vol. Special Issue, p. 1171-1174.
ISSN1611-3683
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