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Stress－rupture Property and Microstructure of Yttria Dispersion Strengthened Alloy MA956

沙维

Rare metals, 1996-07, Vol.15 (3), p.214-221 [Periódico revisado por pares]

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Título:
Stress－rupture Property and Microstructure of Yttria Dispersion Strengthened Alloy MA956
Autor: 沙维
Assuntos: alloys ; and ; Deformation ; fracture ; Metals ; Microstructure
É parte de: Rare metals, 1996-07, Vol.15 (3), p.214-221
Notas: Sha Wei(Department of Civil Fngineering, The Qwen’s Uniwrsity of Belfast, U. K .)
11-2112/TF
ObjectType-Article-2
SourceType-Scholarly Journals-1
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Descrição: The stress-rupture property and corresponding deformed microstructures of an yttria dispersion strengthened alloy bar MA956 (Fe-20%, Cr-4.5%, Al-0.5%, Ti-0.5%, Y sub 2 O sub 3 (wt.%)) were investigated by using tensile stress-rupture testing, fractography (optical and scanning electron microscopy (SEM)), and optical metallography. It has been found that the longitudinal strength is much higher than the transverse strength, as a result of fracture occurring along grain boundaries in the latter orientation when the load direction is normal to the recrystallization grain growth direction. For the same reason, longitudinally tested samples fractured in a ductile manner while transversely tested ones had brittle fracture. It is also found that pre-anneal decreases the longitudinal strength, since it reduces the grain size and therefore increases the amount of grain boundaries. In addition, the effect of grain size on crack propagation was examined.
Idioma: Inglês

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