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学术报告:三维原子探针在核用钢材料中的应用
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报告题目:三维原子探针在核用钢材料中的应用
报告时间:8月27日(周一)9:00开始
报告地点:工艺楼403会议室
 
    报告人简介:叶丽古玛博士,2010年本科毕业于清华大学材料系并留校攻读硕士学位,2011年赴日本东京大学交流。2017年博士毕业于牛津大学材料系,后留校做博士后。主要用三维原子探针及其他辅助方法研究核电站用钢材料在热处理或辐照后的微观结构及性能变化。研究成果在Acta Materialia, Journal of nuclear materials, Philosophical Magazine等杂志发表。
 
    报告摘要:核电用钢材料需具备抗辐射、抗高温等性能。本研究主要用三维原子探针研究了17-4PH及T91两种钢材料在时效及辐照下的原子级微观结构变化。在17-4PH钢的热时效过程中,研究了富Cu团簇,富Nb,富Cr团簇及G-相的形成及发展,并讨论了析出相对机械性能的影响。作为英美合作项目的子项目,对比了T91钢在中子辐照及双离子辐照下的微观结构变化,讨论了离子辐照替代中子辐照的可行性。
 
    Abstract: Iron-based alloys, especially Fe-Cr based steels are widely used as structural materials in current reactors and are proposed as core materials in the design of the next generation of reactor systems. To this end, using atom probe tomography (APT), this study investigates the atomic-scale microstructural changes within two Fe-Cr based steels, 17-4PH steel and T91 steel, subject to heat treatment and irradiation.
 
    17-4PH steel is heat treated at different temperatures. The sequence of microstructural changes at the atomic scale in a 17-4PH steel is characterized by APT. The evolution in number density and fraction of the precipitates have been quantified and a simple model has been developed to estimate their respective contributions to the overall precipitation hardening of the material
 
    As part of a US-UK Integrated Research Project (IRP) project, another aim of this study is to demonstrate the capability to predict the in-reactor evolution of T91 microstructure at high doses, using ion irradiation as a surrogate for neutrons. APT has characterized the microstructural changes in T91 steel for different irradiation conditions, dual beam irradiation (Fe++ and He++) and BOR-60 reactor irradiation.

 

 

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