Microstructural evolution of a dual hardening steel during heat treatment
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in: Micron, Jahrgang 120.2019, Nr. May, 10.02.2019, S. 48-56.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - Microstructural evolution of a dual hardening steel during heat treatment
AU - Hofinger, Matthias
AU - Staudacher, Maximilian
AU - Ognianov, Miloslav
AU - Turk, Christoph
AU - Leitner, Harald
AU - Schnitzer, Ronald
PY - 2019/2/10
Y1 - 2019/2/10
N2 - Dual hardening steels combine precipitation of both secondary hardening carbides and intermetallic phases in a martensitic matrix. Due to this combination, the carbon content necessary to achieve high hardness levels can be reduced, resulting in a decreased amount of large and embrittling carbides. In this study, the influence of different heat treatments on microstructure evolution and secondary hardness is investigated. Different metallographic preparation methods were tested in order to visualize the microstructure. Carbides were characterized using spot-pattern electron backscatter diffraction. For light optical investigations, preparation with V2A-pickle lead to the best results. Preparation with colloidal silica suspension achieved the best results for investigations by scanning electron microscopy and for carbide characterization using electron backscatter diffraction. It was found that a homogenization treatment prior to austenitization was unable to increase the amount of dissolved carbides, and thus had no effect on secondary hardness. By increasing the austenitization temperature, the amount of carbides and secondary hardness could be increased significantly.
AB - Dual hardening steels combine precipitation of both secondary hardening carbides and intermetallic phases in a martensitic matrix. Due to this combination, the carbon content necessary to achieve high hardness levels can be reduced, resulting in a decreased amount of large and embrittling carbides. In this study, the influence of different heat treatments on microstructure evolution and secondary hardness is investigated. Different metallographic preparation methods were tested in order to visualize the microstructure. Carbides were characterized using spot-pattern electron backscatter diffraction. For light optical investigations, preparation with V2A-pickle lead to the best results. Preparation with colloidal silica suspension achieved the best results for investigations by scanning electron microscopy and for carbide characterization using electron backscatter diffraction. It was found that a homogenization treatment prior to austenitization was unable to increase the amount of dissolved carbides, and thus had no effect on secondary hardness. By increasing the austenitization temperature, the amount of carbides and secondary hardness could be increased significantly.
UR - http://www.scopus.com/inward/record.url?scp=85061450907&partnerID=8YFLogxK
U2 - 10.1016/j.micron.2019.02.004
DO - 10.1016/j.micron.2019.02.004
M3 - Article
VL - 120.2019
SP - 48
EP - 56
JO - Micron
JF - Micron
SN - 0968-4328
IS - May
ER -