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Nano Research 2016年第7期9卷 2026-2033页

作者： Zhuo Wang Wei Jia menglei jiang Chen Chen Yadong Li Department of Chemistry & Collaborative Innovation Center for Nanomaterial Science and Engineering Tsinghua University Beijing 100084 China Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China

Multi-shelled CoFe2O4 hollow microspheres with a tunable number of layers （1-4） were successfully synthesized via a facile one-step method using cyclodextrin as a template, followed by calcination. The structural features, including the shell number and shell porosity, were controlled by adjusting the synthesis parameters to produce hollow spheres with excellent capacity and durability. This is a straightforward and general strategy for fabricating metal oxide or bimetallic metal oxide hollow microspheres with a tunable number of shells.

关键词： hollow spheres multi-shelled CoFe2O4 supercapacitor

Free-standing palladium-nickel alloy wavy nanosheets

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Nano Research 2016年第8期9卷 2244-2250页

作者： Weng-Chon Cheong Chuhao Liu menglei jiang Haohong Duan Dingsheng Wang Chen Chen Yadong Li Department of Chemistry and Collaborative Innovation Center for Nanomaterials Science and Engineering Tsinghua UniversityBeijing 100084 China

Two-dimensional nanomaterials （2DNMs） have attracted increasing attention due to their unique properties and promising applications. Unlike 2DNMs with lamellar structures, metal ultrathin 2DNMs are difficult to synthesize and stabilize because they tend to form close-packed crystal structures. Most reported cases consist of monometallic and heterogeneous nanostructures. The synthesis of metal alloy 2DNMs has been rarely reported. Here, we report the synthesis of PdNi alloy wavy nanosheets （WNSs） using an enhanced CO-confinement strategy. This strategy is also suitable to the synthesis of other Pd-based alloy WNSs such as PdCu, PdFe, and even a trimetallic PdFeNi.

关键词： Pd Ni alloy nanosheets carbon monoxide

Helium Bubble Growth in He^(+) Ions Implanted 304L Stainless Steel Processed by Laser Powder Bed Fusion During Post-Irradiation Annealing at 600℃

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Acta Metallurgica Sinica(English Letters) 2022年第9期35卷 1509-1518页

作者： Hui Liu Shiling Min menglei jiang Fuzhong Chu Ying Li Zhuoer Chen Kai Zhang Juan Hou Aijun Huang School of Materials Science and Chemistry University of Shanghai for Science and TechnologyShanghai200093China Department of Industrial and Materials Science Chalmers University of Technology41326GothenburgSweden Monash Centre for Additive Manufacturing(MCAM) Monash UniversityNotting HillVIC3168Australia State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment China Nuclear Power Engineering Co.Ltd.Shenzhen518172China

The abundancy of defect sinks in the microstructure of laser powder bed fusion(LPBF) processed austenitic stainless steels was found to be beneficial for helium *** the current study,the influence of the novel microstructure in LPBF processed 304 L on the helium bubble growth behaviour was investigated using transmission electron microscopy in samples implanted with He^(+) ion and post-irradiation annealing treated at 600℃ for 1 *** variants of LPBF processed 304 L samples were used,one in as-built condition and the other *** comparison between the two samples indicated that the helium bubble growth was inhibited and remained stable in the as-built sample but coarsened significantly in the solution-annealed *** sub-grain boundaries and oxide nano-inclusions acted as defect sinks to trap helium atoms and inhibited the growth of helium bubble in the as-built sample under the post-irradiation annealing conditions used.

关键词： Laser powder bed fusion Stainless steel Helium bubble growth Irradiation tolerance Nano oxide inclusions

A Brief Review on He Ion Irradiation Research of Steel and Iron‑Based Alloys in Nuclear Power Plants

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Acta Metallurgica Sinica(English Letters) 2023年第4期36卷 529-551页

作者： Siyi Qiu Hui Liu menglei jiang Shiling Min Yanlin Gu Qingyan Wang Jing Yang Xuejun Li Zhuoer Chen Juan Hou School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai 200093China China Nuclear Power Engineering Co.Ltd Shenzhen 518124China Department of Industrial and Materials Science Chalmers University of Technology41326 GothenburgSweden State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment China Nuclear Power Engineering Co.LtdShenzhen 518172China

Nuclear power plays a key role as renewable energy in alleviating the worldwide energy *** material degradation caused by high-temperature and high-flux neutron irradiation is the most concerning issue for nuclear reactor safety.A large number of He atoms produced through the(n,α)transmutation reaction diffuse and migrate in metals and accumulate to form He bubbles because of the extremely low solubility of He atoms in metal *** helium bubbles gather at the grain boundary or grain to cause swelling,hardening,embrittlement,and other damages to the in-core structural *** paper mainly summarizes the research progress on He irradiation in steel and iron-based alloys,including the diffusion and accumulation of He atoms,the nucleation and growth of He bubbles,and the microstructure and macroscopic degradation of material performance caused by He *** mechanism of helium irradiation-induced corrosion in steel and iron-based alloys in recent years is reviewed as ***,the investigations on irradiation performance in additive manufactured stainless steels are summarized,and the mechanism of irradiation resistance is prospected.

关键词： Irradiation Helium bubbles Nuclear stainless steel Additive manufacture

Effect of Heat Treatment on the Microstructure,Mechanical Properties and Corrosion Resistance of Selective Laser Melted 304L Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2022年第10期35卷 1688-1702页

作者： Fan Yang Daigen Zhu menglei jiang Hui Liu Shiri Guo Qingyan Wang Hui Wang Kai Zhang Aijun Huang Juan Hou School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai200093China Institute for Advanced Study Chengdu UniversityChengdu610106China Monash Centre for Additive Manufacturing(MCAM) Monash UniversityNotting HillVIC3168Australia State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment Shenzhen518172China

The influence of heat treatment holding temperatures from 600 to 1300℃ on the microstructure,mechanical properties and corrosion resistance in selective laser melted(SLMed)304L stainless steel is investigated in this *** results reveal that there is no remarkable microstructure change after holding at 600℃ for 2 h,while recrystallization leads to a slight decrease in grain size in the temperature range of 700–900℃.The heat treatment at temperatures from 1000 to 1300℃ for 2 h obviously affects the morphology of grains in SLMed 304L stainless *** effects of grain coarsening,delta-ferrite(δ)phases reduction and residual stress release during heat treatment lead to the reduction of yield strength and an increasing *** elongation of the samples heat treated at 800℃ for 2 h is,however,significantly decreased due to the increase in the amount of sigma(σ)phase.A remarkable increase in the amount ofδferrite results in an increase in yield strength but a decrease in ductility after heat treatment at 1300℃ for 2 *** corrosion resistance of the samples heat treated at 1300℃ is significantly improved due to the substantial reduction of brittle phase(σ).There is no obvious effect of the presence ofδferrite on corrosion behavior.

关键词： Selective laser melting 304L stainless steel Heat treatment δferrite Mechanical properties Corrosion resistance

选区激光熔化成形304L不锈钢氦泡长大与辐照硬化行为

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材料导报 2024年第2期38卷 194-199页

作者：侯娟刘慧陈亮闵师领蒋梦蕾中广核工程有限公司核电安全技术与装备全国重点实验室广东深圳518172 上海理工大学材料与化学学院上海200093

采用350 keV He+离子束在300℃下对沉积态和固溶态选区激光熔化成形(Selective laser melting,SLM)304L不锈钢进行辐照,辐照剂量为5×10^(16)ions/cm^(2),随后进行600℃保温1 h退火处理。利用透射电子显微镜(TEM)、正电子湮灭和纳米压... 详细信息

采用350 keV He+离子束在300℃下对沉积态和固溶态选区激光熔化成形(Selective laser melting,SLM)304L不锈钢进行辐照,辐照剂量为5×10^(16)ions/cm^(2),随后进行600℃保温1 h退火处理。利用透射电子显微镜(TEM)、正电子湮灭和纳米压痕仪研究氦泡的长大与材料硬化行为。系统对比了沉积态和固溶态两种状态的SLM 304L样品,结果表明:600℃退火处理时,沉积态SLM 304L不锈钢表现出优异的抗氦泡粗化能力,主要是由于沉积态样品中高密度位错和纳米析出物-基体界面等作为缺陷阱,有效抑制氦泡生长。此外,沉积态样品比固溶态样品具有更高的抗辐照硬化性能,退火处理后两者的硬化率分别为19%和51%。Orowan模型的计算表明,氦泡粗化程度的差异是造成两种状态下SLM 304L不锈钢硬化率不同的主要原因。

关键词：选区激光熔化 304L不锈钢氦离子辐照氦泡长大辐照硬化

尺寸设计对选区激光熔化304L不锈钢显微组织与性能的影响

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金属学报 2023年第5期59卷 623-635页

作者：侯娟代斌斌闵师领刘慧蒋梦蕾杨帆中广核工程有限公司核电安全监控技术与装备国家重点实验室深圳518172 上海理工大学材料与化学学院上海200082

采用选区激光熔化(SLM)技术制备304L不锈钢样品,通过改变扫描道次(T)和打印层数(L)实现不同的温度梯度与凝固速率,研究尺寸效应对微观组织与力学性能的影响。具有不同T×L组合的SLM 304L不锈钢样品沿打印构建方向形成柱状晶组织,并且尺... 详细信息

采用选区激光熔化(SLM)技术制备304L不锈钢样品,通过改变扫描道次(T)和打印层数(L)实现不同的温度梯度与凝固速率,研究尺寸效应对微观组织与力学性能的影响。具有不同T×L组合的SLM 304L不锈钢样品沿打印构建方向形成柱状晶组织,并且尺寸效应影响柱状晶结构。随尺寸增大,凝固组织沿散热方向择优生长的程度高,柱状晶的连续性更好,由低长径比的“米粒形”向近等轴的“短窄形”、进而向高长径比的“长条形”过渡,晶粒粗化现象明显。在较大尺寸样品中,随着不断远离基板也观察到了类似现象。尺寸效应对力学性能的影响主要体现在随着打印尺寸增加,材料的屈服强度下降而塑性延伸率上升,但当尺寸增加至一定程度后力学性能变化趋于稳定。尺寸效应对SLM 304L不锈钢的析出相组成和含量无明显影响。结果表明,影响力学性能的主要影响因素为柱状晶的尺寸和分布,在较大尺寸的样品中,“长条形”柱状晶占比高,导致材料强度降低而塑性增加。结合ANSYS ADDITIVE对凝固速率和温度梯度的模拟仿真结果,对尺寸效应通过影响凝固过程进而对材料微观组织和力学性能产生影响的机理进行了阐述。

关键词：选区激光熔化 304L不锈钢尺寸效应凝固特征力学性能

选区激光熔化成形尺寸对304L不锈钢点蚀性能的影响

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材料研究学报 2023年第5期37卷 353-361页

作者：蒋梦蕾代斌斌陈亮刘慧闵师领杨帆侯娟上海理工大学材料与化学学院上海200093 核电安全监控技术与装备国家重点实验室中广核工程有限公司深圳518172

采用选区激光熔化(SLM)技术制备304L不锈钢样品,通过改变样品的宽度和厚度使其具有不同的成形尺寸。模拟复杂结构零部件在成形过程中不同部位的尺寸和厚度的差异,研究了不同成形尺寸304L样品的显微组织和点蚀行为。结果表明:随着成形尺... 详细信息

采用选区激光熔化(SLM)技术制备304L不锈钢样品,通过改变样品的宽度和厚度使其具有不同的成形尺寸。模拟复杂结构零部件在成形过程中不同部位的尺寸和厚度的差异,研究了不同成形尺寸304L样品的显微组织和点蚀行为。结果表明:随着成形尺寸的增大点蚀坑的数量和面积随之增加。点蚀加剧的主要原因,是晶粒尺寸的增大和残余应力的累积。根据对微观组织结构和NETFABB残余应力的模拟计算结果,揭示了SLM成形尺寸-微观组织-腐蚀行为之间的关系。

关键词：金属材料选区激光熔化 304L不锈钢尺寸效应腐蚀性能 NETFABB模拟

吐哈盆地鲁克沁构造带二叠系—三叠系油气成藏特征与主控因素

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中国石油勘探 2021年第4期26卷 137-148页

作者：武超李宏伟盛双占程甜师效飞姜萌蕾中国石油吐哈油田公司勘探开发研究院

吐哈盆地二叠系—三叠系油气资源潜力大、剩余资源量多,勘探程度低,托克逊凹陷、三堡凹陷、台北凹陷取得零星油气突破,目前勘探主要集中在库木凸起鲁克沁构造带。研究认为,鲁克沁大型复合鼻状凸起带是吐哈盆地二叠系—三叠系油藏最为富... 详细信息

吐哈盆地二叠系—三叠系油气资源潜力大、剩余资源量多,勘探程度低,托克逊凹陷、三堡凹陷、台北凹陷取得零星油气突破,目前勘探主要集中在库木凸起鲁克沁构造带。研究认为,鲁克沁大型复合鼻状凸起带是吐哈盆地二叠系—三叠系油藏最为富集的领域,该构造带构造地层格架复杂,油藏类型多。围绕古凸起的地层上超、断陷回返褶皱、不整合、断陷扇体等有利于形成多种复合圈闭,这些有利条件决定了鲁克沁大型鼻状凸起复式油气聚集带的成藏特征。通过梳理明确了紧邻台北凹陷桃东沟群主力生烃中心是其规模成藏的基础,古隆起为燕山早期油气聚集提供了良好构造背景,早期控制构造的深大断裂是油气纵向运移的主要通道,也是区带差异成藏的关键因素;二叠系梧桐沟组油藏主要受扇三角洲前缘相有利砂体展布控制,三叠系克拉玛依组油藏主要受断块等控制。

关键词：吐哈盆地鲁克沁构造带二叠系—三叠系复式油气聚集带成藏特征主控因素

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TC4合金热浸镀铝干滑动磨损性能的研究

钢铁钒钛 2018年第1期39卷 46-50页

作者：陈伟王浩浩郭孟蕾姜伟王树奇江苏大学材料科学与工程学院

选取TC4合金进行热浸镀铝及高温退火处理，采用SEM、XRD、EDS等微观分析手段表征了镀层形貌、物相和成分，采用销-盘式高速磨损机研究了TC4合金镀层和基体在不同速度和载荷下的干滑动磨损行为，并探讨其磨损机制。结果表明：扩散层以Ti... 详细信息

选取TC4合金进行热浸镀铝及高温退火处理，采用SEM、XRD、EDS等微观分析手段表征了镀层形貌、物相和成分，采用销-盘式高速磨损机研究了TC4合金镀层和基体在不同速度和载荷下的干滑动磨损行为，并探讨其磨损机制。结果表明：扩散层以TiAl3为主相，与基体结合良好，表面平整均匀。在同一载荷下，速度0.5～4 m/s时， TC4合金镀层的磨损率都要低于基体，耐磨性好。镀层和基体的磨损率均呈现出较为相似的变化趋势。0.5～0.75 m/s时，磨损率先降低，之后磨损率迅速上升，2.68 m/s时达到顶值，2.68～4 m/s时磨损率再次降低。0.75 m/s时主要为粘着磨损、磨粒磨损；2.68 m/s时为剥层磨损；4 m/s时以氧化轻微磨损为主。

关键词： TC4合金热浸镀铝磨损行为磨损机制