Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 34A, Issue 11, Pages 2421-2428Publisher
MINERALS METALS MATERIALS SOC
DOI: 10.1007/s11661-003-0002-7
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In order to determine the mechanism of grain-boundary embrittlement and de-embrittlement in age-hardened Fe-Mn-Ni alloys, a detailed analysis on the grain-boundary precipitation behavior was conducted using electron diffraction and electron energy loss spectroscopy (EELS) techniques. The precipitation of theta-MnNi intermetallic particles as well as the precipitation of the austenite phase at prior austenite grain boundaries in association with the grain-boundary embrittlement was confirmed. Interlath fracture was also observed with the precipitation of theta-MnNi particles at the interlath boundaries. The de-embrittlement of these boundaries appears to be a result of the conversion of the theta-MnNi phase to a more ductile austenite phase after extended aging.
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