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Phase‐Specific Precipitation of Intermetallic Phases in Fe Al Mn Ni C Duplex Steels
Author(s) -
Drouven Carsten,
Song Wenwen,
Bleck Wolfgang
Publication year - 2019
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201800440
Subject(s) - intermetallic , materials science , austenite , alloy , microstructure , precipitation , atom probe , metallurgy , annealing (glass) , calphad , duplex (building) , nial , ferrite (magnet) , phase (matter) , phase diagram , composite material , chemistry , dna , biochemistry , physics , organic chemistry , meteorology
A Fe–Al–Mn–Ni–C steel is designed explicitly to precipitate intermetallic phases in specific phases of a duplex steel. CALPHAD‐assisted alloy design is carried out with respect to an innovative “solublility‐assisted precipitation” (SAP) mechanism. A four phase equilibrium comprising of ferrite, austenite, κ‐phase (Fe 3 AlC), and B2‐phase (NiAl) is stabilized in a suitable annealing window. The processing conditions are adjusted according to elemental partitioning and consequential stabilization of κ‐phase in austenite and B2‐phase in ferrite. The feasibility of the SAP mechanism is validated by investigation of microstructure and precipitation evolution using electron microscopy and site‐specific atom probe tomography.