발간논문

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Vol.36, No.3, 342 ~ 348, 1998
Title
Dynamic Strain Aging Behaviors in Nitrogen Alloyed Type 316L Stainless Steel
김대환 , 류우석 , 홍준화 , 국익현 , 최시경 Dae Whan Kim , Woo Seog Ryu , Jun Hwa Hong , Il Hiun Kuk , Si Kyung Choi
Abstract
Tensile tests were conducted with varying strain rate (1×10^(-2)/sec∼2×10^(-4)/sec) at the test temperature range between room temperature and 750℃ to evaluate the effect of nitrogen on dynamic strain aging (DSA) behaviors in nitrogen added type 316L stainless steels. Yield and tensile strength increased without reduction of elongation with adding nitrogen. The temperature range and the critical strain for DSA increased with nitrogen addition. Types A and B serrations were observed at 600℃ and the strain for transition from type A to type B increased with nitrogen addition. Solute atoms for DSA were vacancies and chromium and the activation energy for DSA increased with adding nitrogen. The reason that nitrogen retarded DSA was explained by the fact that nitrogen reduced the chromium diffusion to dislocations due to the strong interaction between nitrogen and chromium.
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