The embrittlement and de-embrittlement of grain boundaries in an Fe-Mn-Ni alloy due to grain boundary segregation of Mn

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Metallurgical Transactions, A

DOI:https://doi.org/10.1007/BF02649769· OSTI ID:250728

Heo, N H; Lee, H C ^[1]

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1. Seoul National Univ. (Korea, Republic of). Dept. of Metallurgical Engineering

A ductile-brittle-ductile (DBD) transition behavior in an age-hardenable Fe-8Mn-7Ni alloy has been analyzed in light of segregation and desegregation of alloying elements at prior austenite grain boundaries. The DBD transition in the alloy can be distinguished by two C-type curves: one corresponding to the start of zero tensile elongation and the other to the finish. The activation energies for ductile-to-brittle and brittle-to-ductile transitions are in close agreement with that for age hardening. Manganese content at the prior austenite grain boundaries was analyzed by Auger electron spectroscopy, and intergranular fracture strength at the brittle fracture region showed inverse trends with Mn concentration at the grain boundaries. All these observations strongly suggest that manganese segregation and its desegregation are responsible for the DBD transition of this alloy.

• Sponsoring Organization: USDOE
• OSTI ID: 250728
• Journal Information: Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 4 Vol. 27; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
AGE HARDENING
AUGER ELECTRON SPECTROSCOPY
BRITTLE-DUCTILE TRANSITIONS
CHEMICAL COMPOSITION
DUCTILE-BRITTLE TRANSITIONS
FRACTURE PROPERTIES
HARDNESS
IRON BASE ALLOYS
MANGANESE ALLOYS
NICKEL ALLOYS
PRECIPITATION
SCANNING ELECTRON MICROSCOPY
TENSILE PROPERTIES