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질소를 첨가한 Type 316L 스테인리스 강의 동적변형시효 거동
김대환,홍준화,최시경,류우석,국익현 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.3
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.
질소함량과 온도변화에 따른 Type 316L 스테인리스 강의 저주기 피로거동
김대환,홍준화,최시경,류우석,국일현 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.10
Strain controlled low cycle fatigue (LCF) tests were conducted in the temperature range between R.T. and 600℃ in type 316L stainless steels with different nitrogen contents. Fatigue life decreased and cyclic stress increased with increasing temperature due to dynamic strain ageing (DSA) at the temperature range of 300∼600℃. The dislocation structures were changed from cell to planar by increasing effect of DSA and short range order(SRO) with increasing temperature and nitrogen addition. Since nitrogen reduced the chromium diffusion coefficients, nitrogen retarded DSA, which resulted in decrease in LCF life at high temperature. So, fatigue life increased with nitrogen addition due to the retardation of DSA and planar slip by SRO.