Abstract
The effect of the pore size on the creep deformation behavior of new Ni-Fe-Cr-Al powder porous metal was investigated. Two different powdered porous metals having different average pore sizes of 580 μm and 800 μm were used. Creep tests were conducted at 1073 K under three different compressive stresses between 0.5 and 1.5 MPa. The Ni-Fe-Cr-Al porous metals mainly consisted of the three phases of γ′-Ni, γ′ and Ni1.1Al0.9. The materials exhibit secondary creep behavior following a power law characterized by creep exponents of 3.7 for the 580 μm and 2.5 for the 800 μm porous metals. The stress exponent values that appeared as two creep exponent values could be made to converge to one value, 3.06, using the new concept of the estimated stress (as determined by the area fraction of the porous metal). This study also presents a creep deformation analysis method that can be applied regardless of the pore size or the presence of a porous structure.
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