TY - UNPB
T1 - Influence of precipitate and grain sizes on the brittle-to-ductile transition in Fe-Al-V Bcc-L21 ferritic superalloys
AU - Ferreirós, P.A.
AU - Sterin, U.A.
AU - Alonso, P.R.
AU - Knowles, A.J.
AU - Rubiolo, G.H.
PY - 2022/6/22
Y1 - 2022/6/22
N2 - The influence of grain and coherent precipitates sizes on strength and brittle-to-ductile transition temperature (BDTT) are studied in a Fe 78 Al 10 V 12 (A2+L2 1 ) ferritic superalloy, toward application in high-efficiency power plants. Additionally, the matrix behaviour was evaluated in a derived single-phase-bcc Fe 84 Al 8 V 8 alloy. Hot tensile tests for strength and Charpy impact tests for BDTT were carried out on samples with controlled precipitate and grain sizes. The increase in cleavage stress by precipitation strengthening follows the same behaviour that the increase in yield stress for coherent strengthened bcc-superalloys. Integration into a physical-based model, which identified a novel interplay with cleavage stress, provides enhanced BDTT predictive capability for ferritic superalloys.
AB - The influence of grain and coherent precipitates sizes on strength and brittle-to-ductile transition temperature (BDTT) are studied in a Fe 78 Al 10 V 12 (A2+L2 1 ) ferritic superalloy, toward application in high-efficiency power plants. Additionally, the matrix behaviour was evaluated in a derived single-phase-bcc Fe 84 Al 8 V 8 alloy. Hot tensile tests for strength and Charpy impact tests for BDTT were carried out on samples with controlled precipitate and grain sizes. The increase in cleavage stress by precipitation strengthening follows the same behaviour that the increase in yield stress for coherent strengthened bcc-superalloys. Integration into a physical-based model, which identified a novel interplay with cleavage stress, provides enhanced BDTT predictive capability for ferritic superalloys.
KW - Fe-Al-V
KW - Superalloy
KW - brittle-to-ductile transition
KW - ageing
KW - precipitate size
KW - impact test
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-85132869726&partnerID=MN8TOARS
U2 - 10.2139/ssrn.4143296
DO - 10.2139/ssrn.4143296
M3 - Preprint
BT - Influence of precipitate and grain sizes on the brittle-to-ductile transition in Fe-Al-V Bcc-L21 ferritic superalloys
PB - SSRN
ER -