발간논문

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Vol.37, No.6, 663 ~ 672, 1999
Title
Research Paper / Mechanical Behavior : A Study on the Effect of Heat Treatment on Mechanical Properties and High Temperature Characteristics in Modified Precipitation Hardening Fe-15Cr-26Ni-1.25Mo Alloy Steel
송영석Young Seok Song, 강성태Sung Tae Kang, 김일봉Il Bong Kim
Abstract
The object of this study is to characterize the high temperature properties and the effect of aging treatment on mechanical properties in modified Fe-15Cr-26Ni-1.25Mo type precipitation hardening alloy containing Ti content of 1.1-1.3 wt%. It has been investigated mainly by tensile test, micro-vickers hardness test, scanning electron microscopy EDAX, charpy n-notch impact, low cycle fatigue, and combination smooth-notch stress-rupture test. The results obtained are summerized as follows; For modified Fe-15Cr-26Ni-1.25Mo type precipitation hardening alloy The optimum heat treatment condition are selected. It is clarified that an optimum Ti content of 1.1-1.3% meets the required mechanical properties of ultra supercritical steam turbine at 649℃. The charpy absorbed energy was almost stable at 13㎏-m∼12㎏-m from R.T to -140℃ The failure cycles(N_f) are 13,022 in Δε_t(%)=0.5 and 1,254 in Δε_t(%)=1 at 650℃. It appers lower notch sensitivity in combination smooth-notch stress-rupture test at 650℃, judging from not fractured at notched part but at smooth part.
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