발간논문

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Vol.32, No.1, 120 ~ 128, 1994
Title
Influence of cold Deformation on the Creep Properties of Incolloy 800H
안용식Y . S . Ahn, 정해용H . Y . Jeong, 정원섭W . S . Chung
Abstract
The Influence of cold pre-deformation on the creep properties at 800℃ has been investigated on the Fe-based superalloy INCOLLOY 800H. The material was plastically deformed in tension or compression at room temperature. Then, creep specimens were machined with the axis either transverse or parallel to the direction of cold deformation. The predeformed specimens show significantly lower creep rate and lower creep strain than unpredeformed specimens. This effect was already found after 2% predeformation and became even more pronounced with increasing pre-deformation. At higher creep stresses, recovery is easier and the effect on the creep rate and ductility is reduced. All creep specimens after cold deformation failed by intergranular fracture, in contrast that the undeformed specimens show transgranular fracture mode for creep stresses higher than 70 MPa.
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