TY - GEN
T1 - Microstructure Evolution of HP40 and HK40 Steels After Isothermal Aging
AU - Lopez-Hirata, Victor M.
AU - Saucedo-Muñoz, Maribel L.
AU - Dorantes-Rosales, Hector J.
AU - Palma, Carlos Ferreira
AU - Pérez-Badillo, Eduardo
AU - Rivas-Lopez, Diego I.
N1 - Publisher Copyright:
© 2022, The Minerals, Metals & Materials Society.
PY - 2022
Y1 - 2022
N2 - Thermo-Calc and experimental analyses were carried out for the as-cast and heat-treated HK40 and HP40 steels. The as-cast steel specimens of about 1 × 1 × 1 cm were aged at 900 °C for times between 100 and 1000 h. As-cast and heat-treated specimens were characterized by X-ray diffraction, SEM, and Vickers hardness. Thermo-Calc Scheil analysis indicated an austenite matrix with the presence of Cr-rich M7C3, and M7C3 and (Nb,Ti)C carbides in the as-cast HK40 and HP40 steels, respectively, which is in agreement with X-ray diffraction, optical microscope, and scanning electron microscope results of present work. The aging treatment at 900 °C produces the precipitation of M23C6 carbides, and M23C6 and (Nb,Ti)C carbides in the austenite matrix of the as-cast HK40 and HP40 steels, respectively. This precipitation process promotes an increase in hardness. Thermo-Calc Prisma also predicted the precipitation of the same phases, and the fastest growth kinetics of precipitation was at 900 °C for the as-cast HK40 and 960 °C for the as-cast HP40 steel. In general, the aging response is better for the as-cast HK40 steel.
AB - Thermo-Calc and experimental analyses were carried out for the as-cast and heat-treated HK40 and HP40 steels. The as-cast steel specimens of about 1 × 1 × 1 cm were aged at 900 °C for times between 100 and 1000 h. As-cast and heat-treated specimens were characterized by X-ray diffraction, SEM, and Vickers hardness. Thermo-Calc Scheil analysis indicated an austenite matrix with the presence of Cr-rich M7C3, and M7C3 and (Nb,Ti)C carbides in the as-cast HK40 and HP40 steels, respectively, which is in agreement with X-ray diffraction, optical microscope, and scanning electron microscope results of present work. The aging treatment at 900 °C produces the precipitation of M23C6 carbides, and M23C6 and (Nb,Ti)C carbides in the austenite matrix of the as-cast HK40 and HP40 steels, respectively. This precipitation process promotes an increase in hardness. Thermo-Calc Prisma also predicted the precipitation of the same phases, and the fastest growth kinetics of precipitation was at 900 °C for the as-cast HK40 and 960 °C for the as-cast HP40 steel. In general, the aging response is better for the as-cast HK40 steel.
KW - HK40 steel
KW - HP40 steel aging
KW - Heat-resistant steels
KW - Mechanical properties
KW - Precipitation
UR - http://www.scopus.com/inward/record.url?scp=85125269631&partnerID=8YFLogxK
U2 - 10.1007/978-3-030-92381-5_137
DO - 10.1007/978-3-030-92381-5_137
M3 - Contribución a la conferencia
AN - SCOPUS:85125269631
SN - 9783030923808
T3 - Minerals, Metals and Materials Series
SP - 1442
EP - 1450
BT - TMS 2022 151st Annual Meeting and Exhibition Supplemental Proceedings
PB - Springer Science and Business Media Deutschland GmbH
T2 - 151st Annual Meeting and Exhibition of The Minerals, Metals and Materials Society, TMS 2022
Y2 - 27 February 2022 through 3 March 2022
ER -