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Journal of Magnesium and Alloys 2021年第3期9卷 818-828页

作者： L.Y.Zhao H.Yan R.S.Chen en-hou han The Group of Magnesium Alloys and Their Applications Institute of Metal ResearchChinese Academy of Sciences62 Wencui RoadShenyang 110016China School of Materials Science and engineering University of Science and Technology of China72 Wenhua RoadShenyang 110016China

The grain growth process plays an important role in the texture formation in magnesium *** microstructural and micro-textural evolution of a cold-rolled Mg-Zn-Gd alloy during annealing at 350℃for 60-190 min were tracked by quasi-in-situ electron backscatter diffraction *** results show that grain growth takes place gradually with the annealing time ***,the TD-split texture maintains the texture type but alters in three aspects-the increased tilting angle,the decreased pole intensity and the widened distribution of high-intensity *** with their c-axis tilting 45-70°from normal direction show preferential growth which is closely associated with the texture *** original grain size advantage is one of the important factors leading to the growth advantage,some grain boundaries,such as 50-60°[1^(-)21^(-)0],50-60°[2750],60-70°[1^(-)21^(-)0](18b),and 70-80°[1^(-)01^(-)0](10)are also considered to be related to this preferential growth.

关键词： Grain growth Preferential growth Texture Static recrystallization Magnesium alloys

Orientations of nuclei during static recrystallization in a cold-rolled Mg-Zn-Gd alloy

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Journal of Materials Science & Technology 2021年第1期60卷 162-167页

The static recrystallization process of a cold-rolled Mg-Zn-Gd alloy was tracked by a quasi-in-situ electron backscatter diffraction method to investigate the orientations of *** results show that orientation distribution of nuclei is associated with nucleation *** continuous static recrystallization nuclei display similar orientations to the parent grains with TD ***,discontinuous static recrystallization nuclei formed within the parent grains(TD-45~0 orientation) show random orientations and a variety of misorientation angles but preferred axes or .Interestingly,a special oriented nucleation is *** static recrystallization nuclei originated from boundaries of the parent grain(TD-70° orientation) show concentrated TD orientations in another side due to the preferred misorientation relationship 70°(∑18 b).It is speculated that these two special misorientation relationships are related to the dislocation type.

关键词： Mg alloys Orientation Nucleation Quasi-in-situ EBSD Static recrystallization

Effects of thiosulfate and dissolved oxygen on crevice corrosion of Alloy 690 in high-temperature chloride solution

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Journal of Materials Science & Technology 2021年第7期66卷 163-176页

作者： Fangqiang Ning Jibo Tan Ziyu Zhang Xinqiang Wu Xiang Wang en-hou han Wei ke CAS Key Laboratory of Nuclear Materials and Safety Assessment Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear MaterialsInstitute of Metal ResearchChinese Academy of SciencesShenyang J10016China School of Materials Science and engineering University of Science and Technology of ChinaHefei 230026China

The crevice corrosion behavior of Alloy 690 was investigated in high-temperature chloride solution containing different concentrations of thiosulfate(S_(2)O_(3)^(2-)) and dissolved oxygen(DO). The S2O32- inhibited corrosion of Alloy 690 through consuming oxygen in aerated chloride solution. In deaerated chloride solution,the S_(2)O_(3)^(2-) was reduced to S° and S^(2-) and subsequently incorporated into the oxide films, which promoted the pitting corrosion at locations of both TiN inclusions and matrix inside the crevice during the crevice corrosion as well as influenced the composition and thickness of the oxide films. The effect mechanisms of S_(2)O_(3)^(2-) and DO on crevice corrosion in high-temperature chloride solution are discussed.

关键词： Alloy Crevice corrosion Pitting corrosion High-temperature corrosion Thiosulfate Oxidation

Effects of surface grinding for scratched alloy 690TT tube in PWR nuclear power plant:Microstructure and stress corrosion cracking

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Journal of Materials Science & Technology 2022年第18期113卷 229-245页

作者： Bin Wu Hongliang Ming Fanjiang Meng Yifeng Li Guangqing He Jianqiu Wang en-hou han School of Materials Science and engineering University of Science and Technology of ChinaShenyang 110016China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shanghai Nuclear engineering Research and Design Institute Ltd.Co. Shanghai 200233China Instrumental Analysis and Research Center Shanghai UniversityShanghai 200444China Department of Materials Science Fudan UniversityShanghai 200433China Shanghai Electric Nuclear Power Equipment Co. Ltd.Shanghai 201306China

Alloy 690TT tube samples with different scratch depths were repaired by grinding treatments using abra-sive papers of two different particle *** microstructure and stress corrosion cracking(SCC)behavior were studied in *** grinding,the plastic accumulation zone vulnerable to SCC was ***,some residual slip steps remained in the scratched *** tests lasting 1000,2000,3000,and 4000 h show that the sensitivity and risk of SCC in the scratched area are decreased by *** using abrasive particles of a smaller size is more ***,deep scratches remained hazardous even after the grinding.

关键词： Alloy 690TT Scratch Surface Stress corrosion High temperature corrosion Intergranular corrosion

Hydrogen-assisted fracture features of a high strength ferrite-pearlite steel

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Journal of Materials Science & Technology 2019年第6期35卷 1081-1087页

作者： Yuefengjiang Bo Zhang Dongying Wang Yu Zhou Jianqiu Wang en-hou han Wei Ke CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and engineering University of Science and Technology of China Shenyang 110016 China Shenyang Blower Works Group Corporation Shenyang 110869 China

Up to now, the exact reason of hydrogen-induced fracture for ferrite-pearlite(FP) steel is still not fully understood. This study presents detail observations of the feature beneath the fracture surface with the aim to reveal the hydrogen-induced cracking initiation and propagation processes. Slow strain rate tensile(SSRT) testing shows that the FP steel is sensitive to hydrogen embrittlement(HE). Focused ion beam(FIB)was used to prepare samples for TEM observations after HE fracture. The corresponding fractographic morphologies of hydrogen charged specimen exhibit intergranular(IG) and quasi-cleavage(QC) fracture feature. Pearlite colony, ferrite/pearlite(F/P) boundary and the adjacent ferrite matrix are found to be responsible for the initial HE fracture and the subsequent propagation. With increasing of the stress intensity factor, fracture mode is found to change from mixed IG and QC to entire QC feature which only occurs at the ferrite matrix. No crack is observed at the ferrite/cementite(F/C) interface. This may be mainly due to the limited pearlite lamella size and relatively low interface energy.

关键词： Ferrite-pearlite steel TEM Fracture Hydrogen embrittlement

Multilayer Graphene:A Potential Anti-oxidation Barrier in Simulated Primary Water

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Journal of Materials Science & Technology 2014年第11期30卷 1084-1087页

作者： Hongliang Ming Jianqiu Wang Zhiming Zhang Siyan Wang en-hou han Wei Ke Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of Sciences

Multilayer graphene as a potential anti-oxidation barrier to protect nickel foils from oxidation was studied in simulated primary water of pressurized water reactors （PWRs）. The results show that after immersion for 1000 h, the structure of the multilayer graphene remains unchanged and no obvious oxide film formed on the graphene coated nickel foils, indicating multilayer graphene can effectively act as the anti-oxidation barrier to protect the substrate from oxidation and hence can improve the heat transfer efficiency of the substrate in simulated primary water of PWRs.

关键词： Graphene Raman spectroscopy X-ray photoelectron spectroscopy Anti-oxidation barrier Simulated primary water

Effect of Hydrogen on Corrosion and Stress Corrosion Cracking of AZ91 Alloy in Aqueous Solutions

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Acta Metallurgica Sinica(english Letters) 2016年第1期29卷 1-7页

作者： Jian Chen Jian-Qiu Wang en-hou han Wei Ke D.W.Shoesmith Department of Chemistry Western University Surface Science Western Western University Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of Sciences

The effect of hydrogen on the corrosion and stress corrosion cracking of the magnesium AZ91 alloy has been investigated in aqueous solutions. Hydrogen produced by corrosion in water diffuses into, and reacts with the Mg matrix to form hydride. Some of the hydrogen accumulates at hydride/Mg matrix （or secondary phase） interfaces as a consequence of slow hydride formation and the incompatibility of the hydride with the Mg matrix （or secondary phase）, and combines to form molecular hydrogen. This leads to the development of a local pressure at the hydride/Mg matrix （or secondary phase） interface. The expansion stress caused by hydride formation and the local hydrogen pressure due to its accumulation result in brittle fracture of hydride. These two combined effects promote both the corrosion rate of the AZ91 alloy, and crack initiation and propagation even in the absence of an external load. Hydrogen absorption leads to a dramatic deterioration in the mechanical properties of the AZ91 alloy, indicating that hydrogen embrittlement is responsible for transgulanar stress corrosion cracking in aqueous solutions.

关键词： AZ91 alloy Corrosion Hydrogen Secondary ion mass spectroscopy (SIMS) Transgulanarstress corrosion cracking (TGSCC)

Influence of Nano-Al Concentrates on the Corrosion Resistance of Epoxy Coatings

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Journal of Materials Science & Technology 2013年第4期29卷 353-358页

作者： Yongchun Liang Fu-Chun Liu Ming Nie Shuyan Zhao Jiedong Lin en-hou han The Electric Power Research Institute of Guangdong Power Grid Corporation State Key Laboratory for Corrosion and Protection Institute of Metal ResearchChinese Academy of Sciences

A two-stage process was used to produce nano-composite epoxy coatings. The first step involved preparing nano-AI concentrates with high concentration and low viscosity, and the second step produced nano- composite epoxy coatings by mixing the nano-AI concentrates and epoxy resin. Later, the coating was examined with immersion and salt spray tests. The coatings were characterized by electrochemical impedance spectroscopy （EIS）, scanning electron microscopy （SEM） and X-ray photoelectron spectroscopy （XPS）. The results showed that the 5% nano-AI significantly improves the corrosion resistance of the coatings. There are two effects of nano-AI on the coating. Nano-AI is corroded initially to protect the substrate from corrosion, and then the aluminum oxide and aluminum hydroxide were produced after corrosion of nano-AI, which hindered the transmission of corrosion fluid into the coatings.

关键词： Nanometer metal Organic coatings Salt spray test Electrochemical impedance spectroscopy

Transferred Monolayer Graphene as a Potential Anti-Oxidation Barrier for Alloy 690TT in Simulated Primary Water

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Journal of Materials Science & Technology 2015年第12期31卷 1171-1174页

作者： Hongliang Ming Siyan Wang Zhiming Zhang Jianqiu Wang en-hou han Wei Ke Key Laboratory of Nuclear Materials and Safety Assessment Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear MaterialsInstitute of Metal ResearchChinese Academy of Sciences

To explore the usage of monolayer graphene as an anti-oxidation barrier in simulated primary water of pressurized water reactors（PWRs）,we transferred the monolayer graphene synthesized by low pressure chemical vapor deposition（LPCVD） on Cu foil to Alloy 690 *** a 500 h immersion,strong oxidation resistance was obtained from the graphene coated Alloy 690 TT sample,indicating that the transferred monolayer graphene can act as an effective barrier to protect the substrate from oxidation in simulated primary water of PWRs.

关键词： Graphene Oxidation 690TT Simulated primary water

Corrosion resistance of tannic acid,d-limonene and nano-ZrO_(2)modified epoxy coatings in acid corrosion environments

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Journal of Materials Science & Technology 2021年第6期65卷 137-150页

作者： Junwei Chang Zhenyu W ang en-hou han Xinlei Liang Gang Wang Zuyao Yi Na Li School of Materials Science and engineering University of Science and Technology of ChinaHefei230026China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Huadian Zhengzhou Mechanical Design Institute Co. Ltd.Zhengzhou450000China

The protection of rusted carbon steel in acid corrosion environments is of great significance for equipment to keep safe *** this work,we presented a method to protect the rusted steel by ru st conversion treatment and epoxy *** acid was selected as rust conversion *** acid,D-limonene and nano-ZrO_(2)were used to improve the corrosion resistance of epoxy *** Raman spectra,Xray diffraction and 3 D confocal images were used to characterize the rust conversion *** hesion test showed that the loss of wet adhesion of the optimal coating was relatively low due to the addition of tannic acid,limonene and nano-ZrO(2).The corrosion resistance of five different coatings was investigated by scanning electron microscopy(SEM)and electrochemical *** show that after 264 h acid immersion,the low frequency resistance of the optimal coating consisting of rust conversion treatment and additives is 10^(7)Ωcm^(2),three orders magnitude higher than that of the pristine ***,SEM indicates that the optimal coating possesses a smooth surface and an unbroken interface between substrate and ***,the corrosion-resistant mechanism of the hybrid coating is proposed.

关键词： Epoxy coatings Corrosion resistance Rust treatment Tannic acid Synergistic inhibition effect