Grain Boundary Embrittlement and De-Embrittlement in Age Hardenable Iron Alloys
| Periodical | Materials Science Forum (Volume 710) |
|---|---|
| Main Theme | Advances in Metallic Materials and Manufacturing Processes for Strategic Sectors |
| Edited by | S.V.S. Narayana Murty |
| Pages | 11-18 |
| DOI | 10.4028/www.scientific.net/MSF.710.11 |
| Citation | Yoon Uk Heo et al., 2012, Materials Science Forum, 710, 11 |
| Online since | January, 2012 |
| Authors | Yoon Uk Heo, Hu Chul Lee |
| Keywords | Age Hardening, Embrittlement, Fe-Mn-Ni Alloy, Grain Boundary, Precipitate, Twinning |
| Price | US$ 28,- |
Grain boundary embrittlement and de-embrittlement observed in age hardening iron alloys were reviewed. Fe-Mn-Ni and Fe-Ni-Ti alloys show excellent hardening response during aging treatment. However these alloys all suffer grain boundary embrittlemnt and show no tensile ductility even after very short aging treatment. Precipitation of intermetallic phases, θ-MnNi in Fe-Mn-Ni alloys and η-Ni3Ti in Fe-Ni-Ti alloys, at grain or lath boundaries was suggested as the reason for the weakening of grain boundary strength. Grain boundary strength recovered when these precipitates transform to austenite after extended aging. Dislocation glide or dislocation climb did critical role in conversion of these grain boundary precipitates to austenite.