TY - JOUR
T1 - The role of silicon in carbon partitioning processes in martensite/austenite microstructures
AU - Kim Lee, B.N.
AU - Sietsma, J.
AU - Santofimia Navarro, Maria
PY - 2017
Y1 - 2017
N2 - Understanding carbon redistribution in steels is crucial in developing advanced high strength steels. For instance, Quenching & Partitioning (Q&P) processes rely on the partitioning of carbon from martensite into austenite, where at the end of the heat treatment the carbon-enriched austenite shows higher stability at room temperature. Recent literature gives increasing evidence of carbide precipitation occurring during partitioning despite the addition of silicon, conventionally thought to suppress carbide precipitation. The aim of the present study is to gain insight into carbon-competing processes by applying a series of Q&P heat treatments, with particular focus on the partitioning stage, where the role of silicon in the stability of austenite is evaluated. Various characterisation techniques are combined in order to unveil the microstructural changes. While carbide precipitation does appear to occur in the presence of silicon, it is found that silicon plays an active role in the stabilisation of the austenite during the partitioning reaction.
AB - Understanding carbon redistribution in steels is crucial in developing advanced high strength steels. For instance, Quenching & Partitioning (Q&P) processes rely on the partitioning of carbon from martensite into austenite, where at the end of the heat treatment the carbon-enriched austenite shows higher stability at room temperature. Recent literature gives increasing evidence of carbide precipitation occurring during partitioning despite the addition of silicon, conventionally thought to suppress carbide precipitation. The aim of the present study is to gain insight into carbon-competing processes by applying a series of Q&P heat treatments, with particular focus on the partitioning stage, where the role of silicon in the stability of austenite is evaluated. Various characterisation techniques are combined in order to unveil the microstructural changes. While carbide precipitation does appear to occur in the presence of silicon, it is found that silicon plays an active role in the stabilisation of the austenite during the partitioning reaction.
KW - Atom probe tomography (APT)
KW - Austenite stability
KW - Carbon
KW - Martensite
KW - X-ray diffraction (XRD)
UR - http://resolver.tudelft.nl/uuid:30c598a1-e4bd-4cfd-a7fd-bb0e191b274c
U2 - 10.1016/j.matdes.2017.04.080
DO - 10.1016/j.matdes.2017.04.080
M3 - Article
AN - SCOPUS:85018980275
SN - 0264-1275
VL - 127
SP - 336
EP - 345
JO - Materials & Design
JF - Materials & Design
ER -