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宋代铁钱的中子衍射研究 被引量:3
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作者 黄维 winfried kockelmann +2 位作者 Evelyn Gordfrey David A Scott 吴小红 《北京大学学报(自然科学版)》 EI CAS CSCD 北大核心 2010年第2期245-250,共6页
利用飞行时间法中子衍射技术(time of flight neutron diffraction)对3枚陕西出土的宋代铁钱进行了无损的相分析,采用英国卢瑟福实验室的高分辨率中子衍射仪GEM(General Materials Diffractometer),定量地揭示了铁钱的相组成、合金成分... 利用飞行时间法中子衍射技术(time of flight neutron diffraction)对3枚陕西出土的宋代铁钱进行了无损的相分析,采用英国卢瑟福实验室的高分辨率中子衍射仪GEM(General Materials Diffractometer),定量地揭示了铁钱的相组成、合金成分与主要锈蚀产物的成分。分析结果表明铁钱的主要物相为铁素体、渗碳体(还含有Fe3P),主要锈蚀产物为棕黄色针铁矿(α-FeOOH),没有发现铁素体晶粒的织构化,表明铁钱系铸造而成。中子衍射这种完全无损且量化的物理实验技术在中国文化遗产的科学分析与保护研究中具有广阔的应用前景。 展开更多
关键词 中子衍射 宋代铁钱 飞行时间法
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Revealing the residual stress distribution in laser welded Eurofer97 steel by neutron diffraction and Bragg edge imaging 被引量:1
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作者 Bin Zhu Nathanael Leung +6 位作者 winfried kockelmann Saurabh Kabra Andrew JLondon Michael Gorley Mark JWhiting Yiqiang Wang Tan Sui 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第19期249-260,共12页
Eurofer97 steel is a primary structural material for applications in fusion reactors. Laser welding is a promising technique to join Eurofer97 plasma-facing components and overcome remote handling and maintenance chal... Eurofer97 steel is a primary structural material for applications in fusion reactors. Laser welding is a promising technique to join Eurofer97 plasma-facing components and overcome remote handling and maintenance challenges. The interaction of the induced residual stress and the heterogeneous microstructure degrades the mechanical performance of such fusion components. The present study investigates the distribution of residual stress in as-welded and post-heat treated Eurofer97 joints. The mechanistic connections between microstructure, material properties, and residual stress are also studied. Neutron diffraction is used to study the through-thickness residual stress distribution in three directions,and neutron Bragg edge imaging(NBEI) is applied to study the residual strain in high spatial resolution.The microstructures and micro-hardness are characterised by electron backscatter diffraction and nanoindentation, respectively. The M-shaped residual stress distribution through the thickness of the as-welded weldment is observed by neutron diffraction line scans over a region of 1.41 × 10 mm^(2). These profiles are cross-validated over a larger area(∼56 × 40 mm^(2)) with the higher spatial resolution by NBEI. The micro-hardness value in the fusion zone of the as-welded sample almost doubles from 2.75 ± 0.09 GPa to 5.06 ± 0.29 GPa due to a combination of residual stress and cooling-induced martensite. Conventional post weld heat treatment(PWHT) is shown to release ∼90% of the residual stress but not fully restore the microstructure. By comparing its hardness with that of stress-free samples, it is found that the microstructure is the primary contribution to the hardening. This study provides insight into the prediction of structural integrity for critical structural components of fusion reactors. 展开更多
关键词 Laser-welded Eurofer97 steel Residual stress Neutron diffraction Neutron Bragg edge imaging Nanoindentation EBSD
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