ISSN 2594-5297
51º Seminário de Laminação - Processos e Produtos Laminados e Revestidos - Internacional — vol. 51, num.51 (2014)
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An experimental investigation was conducted using laboratory-processed, 0.12C–1.70Mn–0.2V steels with different Cr or Mo additions aiming to evaluate this influence on the microstructure and mechanical properties hot rolled steels. Steels were processed in a pilot rolling equipment, simulating a typical thermomechanical processing, with finishing rolling steps above Ar3, followed by accelerated cooling and 723 K (450 Celsius) coiling temperature. Microstructures and precipitates were analyzed using OM, SEM and TEM, while mechanical properties were evaluated by tensile and hole expansion tests. Since Cr and Mo increase hardenability of austenite, and as a consequence, the volume fraction of the acicular constituents increases with gradual additions of Cr or Mo. Moreover, Cr or Mo impacted V precipitation process, reducing average size of particles. At 0.50%Mo, V precipitation was inhibited. Effects of this microstructure evolution on the final mechanical properties were also analyzed, as well as a comparison between Cr and Mo effects, with Mo presenting more effective influence.
An experimental investigation was conducted using laboratory-processed, 0.12C–1.70Mn–0.2V steels with different Cr or Mo additions aiming to evaluate this influence on the microstructure and mechanical properties hot rolled steels. Steels were processed in a pilot rolling equipment, simulating a typical thermomechanical processing, with finishing rolling steps above Ar3, followed by accelerated cooling and 723 K (450 Celsius) coiling temperature. Microstructures and precipitates were analyzed using OM, SEM and TEM, while mechanical properties were evaluated by tensile and hole expansion tests. Since Cr and Mo increase hardenability of austenite, and as a consequence, the volume fraction of the acicular constituents increases with gradual additions of Cr or Mo. Moreover, Cr or Mo impacted V precipitation process, reducing average size of particles. At 0.50%Mo, V precipitation was inhibited. Effects of this microstructure evolution on the final mechanical properties were also analyzed, as well as a comparison between Cr and Mo effects, with Mo presenting more effective influence.
Palavras-chave
Microstructures; Precipitation; Thermomechanical processing; Effect of Cr and Mo; C-Mn-V Steel
Microstructures; Precipitation; Thermomechanical processing; Effect of Cr and Mo; C-Mn-V Steel
Como citar
Charles de Abreu Martins;
Nina M. Fonstein;
Leonardo Barbosa Godefroid.
EFFECTS OF Mo AND Cr ON MICROSTRUCTURES AND MECHANICAL PROPERTIES OF HOT ROLLED C-MN-V ADVANCED HIGH STRENGTH STEELS
,
p. 2986-2996.
In: 51º Seminário de Laminação - Processos e Produtos Laminados e Revestidos - Internacional,
Foz do Iguaçu - Brasil,
2014.
ISSN: 2594-5297
, DOI 10.5151/1983-4764-25338
