Precipitation reactions in a Cu-Ni-Al medium carbon alloyed dual hardening steel
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In: Materials characterization, Vol. 160.2020, No. February, 110126, 09.01.2020.
Research output: Contribution to journal › Review article › peer-review
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T1 - Precipitation reactions in a Cu-Ni-Al medium carbon alloyed dual hardening steel
AU - Hofinger, Matthias
AU - Turk, Christoph
AU - Ognianov, Miroslav
AU - Leitner, Harald
AU - Schnitzer, Ronald
N1 - Publisher Copyright: © 2020 Elsevier Inc.
PY - 2020/1/9
Y1 - 2020/1/9
N2 - Dual hardening steels achieve secondary hardening through the combined precipitation of intermetallic phases and carbides. The early stages of precipitation of a Cu-Ni-Al medium carbon alloyed dual hardening steel with a low alloying ratio of Cu/NiAl were investigated. Phase separation during continuous heating with 20 K min − 1 was identified to occur in the temperature range from 360 °C to 620 °C by differential scanning calorimetry. The precipitates were characterized utilizing atom probe tomography. Different cluster search algorithms were used in order to determine the sequence of phase separation and thus identify the individual precipitation reactions. It was shown that phase separation starts with the formation of Cu (Ni, Al, Mn) clusters. At an ageing temperature of 580 °C, heterogeneous precipitation of VC-clusters at the interfaces between the Cu-precipitates and the iron matrix takes place. A phase separation of the Cu (Ni, Al, Mn) clusters into separate Cu and NiAl particles could not be observed up to an ageing temperature of 620 °C. The sequence of precipitation is thus determined to be Cu-VC-NiAl.
AB - Dual hardening steels achieve secondary hardening through the combined precipitation of intermetallic phases and carbides. The early stages of precipitation of a Cu-Ni-Al medium carbon alloyed dual hardening steel with a low alloying ratio of Cu/NiAl were investigated. Phase separation during continuous heating with 20 K min − 1 was identified to occur in the temperature range from 360 °C to 620 °C by differential scanning calorimetry. The precipitates were characterized utilizing atom probe tomography. Different cluster search algorithms were used in order to determine the sequence of phase separation and thus identify the individual precipitation reactions. It was shown that phase separation starts with the formation of Cu (Ni, Al, Mn) clusters. At an ageing temperature of 580 °C, heterogeneous precipitation of VC-clusters at the interfaces between the Cu-precipitates and the iron matrix takes place. A phase separation of the Cu (Ni, Al, Mn) clusters into separate Cu and NiAl particles could not be observed up to an ageing temperature of 620 °C. The sequence of precipitation is thus determined to be Cu-VC-NiAl.
UR - http://www.scopus.com/inward/record.url?scp=85077759005&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2020.110126
DO - 10.1016/j.matchar.2020.110126
M3 - Review article
VL - 160.2020
JO - Materials characterization
JF - Materials characterization
SN - 1044-5803
IS - February
M1 - 110126
ER -