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Vol.33, No.11, 1431 ~ 1438, 1995

Title

Strengthening of Metastable Austenitic Stainless Steels by Reversion Treatment

김영환 , 안용식 , 정해용 , 강창용 , 정병호 , 김창규 Y . H . Kim , Y . S . Ahn , H . Y . Jeong , C . H . Kang , B . H . Jeong , C . G . Kim

Abstract

Austenite phase in metastable Fe-Cr-Ni ternary stainless steels was fully transformed to martensite(α`) phase by 90% cold rolling and this martensite single phase reverted to austenite again at temperature range from 773 to 1073K. The mixed phase structure consists of reversed ultra-fine austenite grains with the diameter of 0.5 ㎛ and remained α`. Their mechanical properties were investigated as a function of α` content and austenite stability. The main results may be summarized as follows : (1) The good combination of high yield strength over 800MPa and elongation near 20% was obtained from the mixed structure containing a higher content of α`, as Ni and Cr contents are lowered. (2) In the mixed structure, elongation was greatly affected by the TRIP behavior in the initial stage of deformation. (3) The ultra-fine graining of austenite more stabilized the mixed structure. (4) The abrupt drop of elongation in the mixed structure occurred at a limited content of α` in according to the difference of austenite stability. This phenomenon was well explained by the criterion equation of the plastic stability.

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