The mechanism of tensile yield in an age-hardened steel containing γ′ (ordered Ni3Ti) precipitates
作者： L.K Singhal , J.W Martin
DOI: 10.1016/0001-6160(68)90061-8
关键词: Composite material 、 Materials science 、 Shearing (physics) 、 Yield (engineering) 、 Metallurgy 、 Alloy 、 Hardened steel 、 FOIL method 、 Deformation (engineering) 、 Ultimate tensile strength 、 Austenite
摘要: Abstract An alloy of composition 24% Ni, 17% Cr, 2% Ti (bal. Fe) was heat-treated to produce precipitation the γ′ (ordered Ni 3 Ti)-phase in austenite, and proof stress-ageing time curves were obtained for specimens aged at 725 750°C. Electron microscopy thin foil from test-pieces carried out, mechanism plastic yield identified: presence superdislocations, associated with particle-shearing observed under-aged specimens, Orowan loops overaged specimens. A transition behaviour between these mechanisms noted peak-hardened condition. The deformation during tensile 650°G similar those after room temperature deformation. theoretical estimate is made increment stress due dispersion produced on ageing two temperatures. experimental are reasonable agreement predictions, change shearing looping a particle-size approximately 50 725°C very good theory.
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