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Tensile properties and deformation microstructure of highly neutron-irradiated 316 stainless steels at low and fast strain rate
Journal of Nuclear Materials ( IF 3.1 ) Pub Date : 2018-05-31 , DOI: 10.1016/j.jnucmat.2018.05.068
A. Renault-Laborne , J. Hure , J. Malaplate , P. Gavoille , F. Sefta , B. Tanguy

Post-irradiation deformation behavior of solution-annealed (SA) and cold-worked (CW) 316 austenitic stainless steel irradiated to doses from 9 to 39 dpa is examined as a function of strain rate and irradiation conditions (neutron spectrum, temperature). Tensile properties are found to be significantly higher for lower irradiation temperature and for CW material, for similar irradiation levels. The effect of strain rate on tensile properties is shown to be weak in the range [10−8s−1; 10−4s−1]. TEM investigations after deformation for levels of plastic strain of about 1% show on SA 316 the presence of deformation bands corresponding to one or even a mixture of twins, extended stacking faults, α′-martensite islands and ε-martensite nanobands. Bundles of crisscrossing bands, found to be a composite of overlapping stacking faults, nanotwins and ε-martensite nanolayers, are observed at TEM foils edges near the grain boundaries with α′-martensite islands decorating these edges. Except observation of a slight decrease of the number of deformation bands in the specimen deformed at slower strain rate, no qualitative microstructural differences appear between specimens tested at slow and fast strain rates.



中文翻译:

高中子辐照的316不锈钢在低应变速率和快速应变速率下的拉伸性能和变形显微组织

考察了固溶退火(SA)和冷加工(CW)316奥氏体不锈钢在9至39 dpa剂量下的辐照后变形行为,它是应变速率和辐照条件(中子谱,温度)的函数。对于较低的辐照温度和对于CW材料,在相似的辐照水平下,拉伸性能明显更高。应变率对拉伸性能的影响在[10 -8 s -1范围内]较弱。10 -4 s -1]。变形后TEM的塑性应变水平约为1%的TEM研究表明,在SA 316上存在对应于一个或什至是孪晶,扩展堆叠断层,α'-马氏体岛和ε-马氏体纳米带的变形带。在晶粒边界附近的TEM箔边缘观察到成束的交叉带,这些带是重叠的堆垛层错,纳米孪晶和ε-马氏体纳米层的复合物,并用α'-马氏体岛装饰这些边缘。除了观察到在较低应变速率下变形的试样中的变形带数量略有减少之外,在较低应变速率和快速应变速率下测试的试样之间没有出现定性的微观结构差异。

更新日期:2018-05-31
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