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Study of Microstructure and Property Changes in Irradiated SS316 Wrapper of Fast Breeder Test Reactor

机译：快速育种试验反应器辐照的SS316包装中的微观结构和性能变化研究

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This paper presents the results of a study on mechanical properties and microstructure in a SS316 wrapper irradiated in a 40MWt/13MWe fast breeder test reactor at Kalpakkam, India. Transmission electron microscopy (TEM) examination and mechanical property evaluation were carried out on the hexagonal wrapper subjected to different displacement damages up to a maximum of 83 dpa at an operating temperature of about 673 K. The steel irradiated to 83 dpa showed an increase in the yield strength and ultimate tensile strength, with a reduction in uniform elongation to about 8 %-10 % from about 20 % in the unirradiated material. Density measurements on the specimen from different portions of the irradiated wrapper showed a peak volumetric swelling of about 3.5 % at a damage of 83 dpa. TEM studies showed extensive void formation at 40 dpa and beyond in addition to extensive precipitation and formation of dislocation loops. The void density and size showed a progressive increase with displacement damage. The precipitates were identified to be of nickel and silicon enriched M6C type of -n phase, while radiation induced G phase was also observed at 83 dpa. The increase in strength and reduction in ductility with increase in dpa is attributed to irradiation hardening, which is supported by the increase in defect density as observed from the dislocation substructure and increase in the void density and size. The paper would discuss the degradation in mechanical property in terms of the microstructural changes.
机译：本文介绍了在印度的40MWT / 13MWE快速育种者试验反应器中辐照的SS316包装物中机械性能和微观结构研究的结果。在经过不同位移损伤的六边形包装物上进行透射电子显微镜（TEM）检查和机械性能评估在约673k的工作温度下最大为83dPa的六边形包装物上。辐照为83 dPa的钢，显示出增加的钢屈服强度和极限拉伸强度，在未照射材料中的均匀伸长率下降至约20％的约8％-10％。来自照射包装物的不同部分的样品上的密度测量显示出83dPa损伤的峰容量溶胀约3.5％。 TEM研究表明，在40 dPA和超越沉淀和脱位环的形成之外，外部的空隙形成。空隙密度和尺寸显示出逐渐增加，随着位移损坏。将沉淀物鉴定为镍和硅富集的M6C型-N相，而在83dPa下也观察到辐射诱导的G相。随着DPA的增加，延展性的强度和降低的增加归因于照射硬化，其通过从位错子结构观察到的缺陷密度的增加并增加空隙密度和尺寸而负载。本文将在微观结构变化方面讨论机械性质的降解。

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