발간논문

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Vol.35, No.7, 816 ~ 825, 1997
Title
Effect of Heat Treatment on the Mechanical Properties of Multi-Pass Hot Rolled Zr-2.5wt%Nb alloy
최성배 , 권숙인 , 황선근 , 김명호 , 김영석 Sung Bae Choi , S . I . Kwun , S . K . Hwang , M . H . Kim , Y . S . Kim
Abstract
The effect of multi-pass hot rolling and subsequent heat treatments of Zr-2.5wt%Nb alloy on microstructures and mechanical properties was investigated in a view point of texture, impurity atoms and phase transformation using DSC, XRD and TEM The multi-pass hot rolled specimen showed high yield strength above 1000㎫ and low elongation below 3% due to strong interaction between dislocation substructures and impurity atoms of Fe and Cr during hot rolling. The stress relieve annealing induced some precipitation of Nb atoms resulting in still high strength and low ductility due to strain aging effect. However, the remarkable increase of elongation up to 20% with yield strength of 750㎫ after recrystallization heat treatment was caused by fine recrystallized grains with Zr(Cr,Fe)₂ precipitates. (Received January 30, 1997)
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