Analysis of the elevated temperature deformation mechanisms and grain boundary strengthening of the alumina-forming austenitic stainless steel Fe–20Cr–30Ni–2Nb–5Al

Analysis of the elevated temperature deformation mechanisms and grain boundary strengthening of the alumina-forming austenitic stainless steel Fe–20Cr–30Ni–2Nb–5Al
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氧化铝奥氏体不锈钢Fe~20Cr~30Ni~2Nb~5Al高温变形机制及晶界强化分析

DOI:
10.1016/j.msea.2021.141219
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发表时间:
2021
期刊:
Materials Science and Engineering: A
影响因子:
--
通讯作者:
Baker, Ian
Baker, Ian
中科院分区:
--
文献类型:
--
作者:
Peterson, Andrew;Baker, Ian

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研究了Fe-20Cr-30Ni-2Nb-5Al奥氏体不锈钢的变形机理。%)在750°C下进行蠕变试验和应变速率跳变试验。结果表明,l12结构的纳米相是基体中主要的析出相,并提供了大部分的强化。这种行为可以用幂律蠕变方程中的阈值应力项来很好地模拟。此外,似乎存在一种晶界强化机制,其中沉淀覆盖的晶界作为位错运动的障碍。这可以再次使用幂律蠕变方程进行建模。除了阻挡位错外,晶界沉淀还可以防止蠕变过程中的晶界滑动。虽然晶界表现出多种强化机制,但所有试验最终都沿晶界失效。
The deformation mechanisms of an alumina-forming austenitic stainless-steel Fe–20Cr–30Ni–2Nb–5Al (at. %) were investigated at 750 °C using both creep tests and strain rate jump tests. It was found that nano-sized L12-structured precipitates were the dominant precipitate in the matrix and provided the majority of the strengthening. This behavior could be modeled well using a threshold stress term in a power law creep equation. Additionally, there appears to be a grain boundary strengthening mechanism in which the grain boundaries covered by precipitates act as barriers to dislocation movement. This could be again modeled using a power law creep equation. In addition to blocking dislocations, the grain boundary precipitates also prevent grain boundary sliding during creep. While the grain boundaries showed several strengthening mechanisms, all tests ultimately failed along the grain boundaries.
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