Study of the effect of helium, irradiation, and temperature on the embrittlement of Inconel X-750 CANDU garter spring spacers

氦气、辐照和温度对 Inconel X-750 CANDU 卡簧垫片脆化影响的研究

• 批准号: 469710-2014
• 负责人: Klassen, Robert
• 金额: $ 2.19万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=577447
• 关键词: Study; effect; helium; irradiation; temperature

This proposed project will use high energy ion irradiation combined with micro-mechanical testing and micro-structural analyses to assess the effect of irradiation damage, irradiation temperature, and helium accumulation on the strength, ductility, and tendency for grain-boundary embrittlement of Inconel X-750 CANDU garter spring spacers. Various amounts of helium ions will be implanted, at two temperatures, into Inconel X-750 samples followed by implantation of high energy nickel ions to invoke crystallographic damage similar to that resulting from neutron irradiation. Nano-indentation hardness testing will be used to assess the combined effect of the accumulated helium and ion-irradiation damage on the hardness of the Inconel alloy. Focused ion beam milling will be used to fabricate cantilever micro-beams, about 100 micrometers in length, across selected grain boundaries of the ion-implanted samples. These beams will then be tested by bending to assess the effect of the helium and irradiation damage on the strength of the grain boundaries. This project will present, for the first time, experimental evidence linking neutron irradiation damage and helium accumulation to the hardening and the onset of grain boundary embrittlement in Inconel X-750CANDU garter spring spacers. These data are currently of great importance since they impact the determination of fitness for service of fuel channel components that are currently in service in CANDU reactors.

该项目将使用高能离子辐照结合微观机械测试和微观结构分析，以评估辐照损伤、辐照温度和氦积累对Inconel X-750 CANDU合金吊链弹簧垫片的强度、延展性和晶界脆化趋势的影响。在两种温度下，将不同量的氦离子注入Inconel X-750样品中，然后注入高能镍离子，以引起类似于中子辐照引起的晶体损伤。纳米压痕硬度测试将用于评估累积氦和离子辐照损伤对Inconel合金硬度的综合影响。聚焦离子束铣削将被用来制造悬臂梁微梁，约100微米的长度，跨越选定的离子注入样品的晶界。 然后，这些光束将通过弯曲进行测试，以评估氦和辐照损伤对晶界强度的影响。 该项目将首次提出将中子辐照损伤和氦积累与Inconel X-750 CANDU夹簧垫片的硬化和晶界脆化的发生联系起来的实验证据。这些数据目前非常重要，因为它们影响到目前在CANDU反应堆中使用的燃料通道部件的适用性的确定。