TY - JOUR
T1 - Phase Transformations of 5Cr-0.5Mo-0.1C Steel after Heat Treatment and Isothermal Exposure
AU - Saucedo-Muñoz, Maribel L.
AU - Lopez-Hirata, Victor M.
AU - Dorantes-Rosales, Hector J.
AU - Villegas-Cardenas, Jose D.
AU - Rivas-Lopez, Diego I.
AU - Beltran-Zuñiga, Manuel
AU - Ferreira-Palma, Carlos
AU - Moreno-Palmerin, Joel
N1 - Publisher Copyright:
© 2022 by the authors.
PY - 2022/8
Y1 - 2022/8
N2 - This study consists of the experimental and numerical analysis of the phase transformations of 5Cr-0.5Mo.0.1C steel after heat treatment. The microstructure of the as-received steel comprised ferrite and bainite, which is in agreement with the microconstituents predicted by the Calphad-calculated TTT diagram. Calphad-based precipitation calculations show that the cooling stage of normalizing treatment did not cause carbide formation. In contrast, tempering at 700 °C for 15 min promotes the intergranular precipitation of Fe3C, M7C3 and M23C6 carbides, which is consistent with experimental results. Aging at 600 °C for short periods caused the precipitation of both M7C3 and M23C6 carbides; however, M23C6 is the dominant phase after prolonged aging. This is in agreement with experimental results. A rapid decrease in the steel hardness was observed after short aging, which is attributable to bainite transformation. Further reduction in hardness is associated with the diffusion-controlled coarsening of M23C6 carbide.
AB - This study consists of the experimental and numerical analysis of the phase transformations of 5Cr-0.5Mo.0.1C steel after heat treatment. The microstructure of the as-received steel comprised ferrite and bainite, which is in agreement with the microconstituents predicted by the Calphad-calculated TTT diagram. Calphad-based precipitation calculations show that the cooling stage of normalizing treatment did not cause carbide formation. In contrast, tempering at 700 °C for 15 min promotes the intergranular precipitation of Fe3C, M7C3 and M23C6 carbides, which is consistent with experimental results. Aging at 600 °C for short periods caused the precipitation of both M7C3 and M23C6 carbides; however, M23C6 is the dominant phase after prolonged aging. This is in agreement with experimental results. A rapid decrease in the steel hardness was observed after short aging, which is attributable to bainite transformation. Further reduction in hardness is associated with the diffusion-controlled coarsening of M23C6 carbide.
KW - C-Cr-Mo steels
KW - heat treatment
KW - mechanical properties
KW - phase transformations
KW - precipitation
UR - http://www.scopus.com/inward/record.url?scp=85137796461&partnerID=8YFLogxK
U2 - 10.3390/met12081378
DO - 10.3390/met12081378
M3 - Artículo
AN - SCOPUS:85137796461
SN - 2075-4701
VL - 12
JO - Metals
JF - Metals
IS - 8
M1 - 1378
ER -