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Stress Corrosion Cracking and Blue Brittleness of Rotor Steels in High Temperature Aqueous Solutions

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Journal of Materials Science & Technology 2000年第6期16卷 631-633页

作者： Wang, YB chu, wy Qiao, LJ Univ Sci & Technol Beijing Dept Mat Phys Beijing 100083 Peoples R China

The tensile behaviors of two bolt steels 20Cr12NiMoWV and 25Cr2MoV, and rotor steel 30Cr2Ni4MoV used in a nuclear power plant were studied at different temperatures up to 280℃ in air and aqueous solution. The results showed that blue brittleness occurred near 230℃ and 180℃ for steels 30Cr2Ni4MoV and 25Cr2MoV, respectively. No blue brittleness was found for the steel containing higher Cr content. Susceptibility to stress corrosion cracking (SCC) for the steels in aqueous solution at the test temperatures was very low except at the blue brittleness temperature. At the blue brittleness temperatures, however, the susceptibility to SCC was very high.

关键词： Steel

The in-situ TEM observation of chemisorption facilitating dislocation emission, multiplication and motion

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Chinese Science Bulletin 1997年第10期42卷 875-878页

作者： Su, YJ Wang, YB chu, wy Department of Marierals Physics University of Science and Technology of Beijing Beijing China

THE reduction in ductility and fracture stress of many metals tested in certain liquid metal envi-ronments is generally known as liquid metal embrittlement（LME）.The resistance to fractureR=（1-v2）KIC2（L）/E,calculated by the fracture toughness KIC（L）in LME,is often 1—3orders of magnitude greater than the surface energy of the material,γ.Orowan’s equationof R=2γeff=γ+γP must be used in considering LME rather than Griffith’s equation of R=2γ,where γP is plastic work *** experiments in LME showed that γP=（10—1 000）γ.It has been shown that there is localized plastic deformation in brittle failure induced bythe chemisorption of liquid metal.

关键词： Al liquid metal embrittlement chemisorption TEM.

In-situ TEM Observation of Dislocation Emission, Multiplication and Motion Induced by Anodic Dissolution in Type 310 Stainless Steel

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Journal of Materials Science & Technology 1996年第3期12卷 215-218页

作者： Huang, YZ Chen, QZ chu, wy Dept. of Materials Physics University of Science and Technology Beijing Beijing 100083 China

A special constant deflection device for TEM has been designed and then the dislocation configuration change ahead of a loaded crack tip after corrosion or anodic dissolution for some time but before the initiation of SCC can be observed in TEM. The results showed that anodic dissolution during SCC of a type 310 stainless steel in deionized water could promote dislocation emission, multiplication and motion before the initiation of SCC.

关键词： TEM In-situ TEM Observation of Dislocation Emission Multiplication and Motion Induced by Anodic Dissolution in Type 310 Stainless Steel

Investigation of stress corro-sion-enhanced plastic deformation using atomic force microscope

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Chinese Science Bulletin 2002年第12期47卷 1053-1056页

作者： Liang, S Qiao, LJ chu, wy Univ Sci & Technol Beijing Dept Mat Phys Beijing 100083 Peoples R China

Atomic force microscope (AFM) was used to study in situ the change in slip bands during stress corrosion of brass in the ammonia solution prior to initiation of stress corrosion crack. The result showed that additive slip bands appeared ahead of a loaded notch tip during stress corrosion prior to initiation of stress corrosion crack after the constant deflection specimen was precrept for 48 h and then polished. The average height and spacing of slip bands generated during stress corrosion were about three times less or larger, respectively, than those during loading in air.

关键词： brass stress corrosion atomic force microscope.

In-situ Observation of Initiation and Propagation of Cleavage Microcrack in TiAl

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Journal of Materials Science & Technology 1995年第1期11卷 11-14页

作者： GAO, KW CHEN, QH chu, wy HSIAO, CM

Nucleating and propagating of nanocrack formed in dislocation free zone (DFZ) for the brittle TiAl alloy has been studied through in-situ tensile test in TEM and analyzed using microfracture mechanics. The results show that a lot of dislocations can be emitted from a crack tip when the applied stress intensity K-la is larger than the stress intensity for dislocation emission K-le = 1.4 MPa . m(1/2) and a dislocation free zone, which sometimes is a close zone, can form after reaching equilibrium. The DFZ is a elastic zone with large strain and then the stress in the DFZ might equal to the cohesive strength sigma(th) because the crack tip is still sharp. When K-la is larger than the stress intensity for nanocrack nucleation K-li = 2.4 MPa . m(1/2), the stress within a certain range in the DFZ would equal to sigma(th) and then a nanocrack initiates in the DFZ or sometimes at the notch tip. The nanocrack formed in the DFZ is stable and can propagate a small distance in cleavage mode through multiplication and movement of dislocation in the plastic zone, during keeping constant displacement. Increasing K-la, can make the crack stably propagate continuously or discontinuously and it means that the stress intensify for crack propagation, K-lp, is larger than K-li. Therefore, K-le [K-li [K-lp [K-lC.

关键词： TiAl Figure DFZ

Prediction and optimization of flue pressure in sintering process based on SHAP

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 346-359页

作者： Mingyu Wang Jue Tang Mansheng chu Quan Shi Zhen Zhang School of Metallurgy Northeastern UniversityShenyang 110819China Liaoning Low-Carbon Steelmaking Technology Engineering Research Center Northeastern UniversityShenyang 110819China Engineering Research Center of Frontier Technologies for Low-Carbon Steelmaking(Ministry of Education) Shenyang 110819China

Sinter is the core raw material for blast *** pressure,which is an important state parameter,affects sinter *** this paper,flue pressure prediction and optimization were studied based on the shapley additive explanation(SHAP)to predict the flue pressure and take targeted adjustment ***,the sintering process data were collected and processed.A flue pressure prediction model was then constructed after comparing different feature selection methods and model algorithms using SHAP+extremely random-ized trees(ET).The prediction accuracy of the model within the error range of±0.25 kPa was 92.63%.SHAP analysis was employed to improve the interpretability of the prediction *** effects of various sintering operation parameters on flue pressure,the relation-ship between the numerical range of key operation parameters and flue pressure,the effect of operation parameter combinations on flue pressure,and the prediction process of the flue pressure prediction model on a single sample were analyzed.A flue pressure optimization module was also constructed and analyzed when the prediction satisfied the judgment *** operating parameter combination was then *** flue pressure was increased by 5.87%during the verification process,achieving a good optimization effect.

关键词： sintering process flue pressure shapley additive explanation prediction optimization

Morphology engineering of ZnO micro/nanostructures under mild conditions for optoelectronic application

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 498-503页

作者： Liang chu Haoyu Shen Hudie Wei Hongyu Chen Guoqiang Ma Wensheng Yan Institute of Carbon Neutrality and New Energy&School of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018China School of Applied Physics and Materials Wuyi UniversityJiangmen 529020China

Zinc oxide(ZnO)serves as a crucial functional semiconductor with a wide direct bandgap of approximately 3.37 *** reaction is commonly used in the synthesis of ZnO micro/nanostructures,given its low cost,simplicity,and easy ***,ZnO morphology engineering has become desirable through the alteration of minor conditions in the reaction process,particularly at room *** this work,ZnO micro/nanostructures were synthesized in a solution by varying the amounts of the ammonia added at low temperatures(including room temperature).The formation of Zn^(2+)complexes by ammonia in the precursor regulated the reaction rate of the morphology engineering of ZnO,which resulted in various structures,such as nanoparticles,nanosheets,microflowers,and single ***,the obtained ZnO was used in the optoelectronic application of ultraviolet detectors.

关键词： morphology engineering low temperature ZnO nanosheets microflowers ultraviolet detector

Treadmill exercise in combination with acousto-optic and olfactory stimulation improves cognitive function in APP/PS1 mice through the brain-derived neurotrophic factor-and Cygb-associated signaling pathways

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Neural Regeneration Research 2025年第9期20卷 2706-2726页

作者： Biao Xiao Chaoyang chu Zhicheng Lin Tianyuan Fang Yuyu Zhou chuxia Zhang Jianghui Shan Shiyu Chen Liping Li Department of Physiology and Pharmacology Health Science CenterNingbo UniversityNingboZhejiang ProvinceChina Ningbo Key Laboratory of Behavioral Neuroscience Health Science CenterNingbo UniversityNingboZhejiang ProvinceChina Key Laboratory of Addiction Research of Zhejiang Province NingboZhejiang ProvinceChina

A reduction in adult neurogenesis is associated with behavioral abnormalities in patients with Alzheimer's ***,enhancing adult neurogenesis represents a promising therapeutic approach for mitigating disease symptoms and ***,nonpharmacological interventions aimed at inducing adult neurogenesis are currently *** individual non-pharmacological interventions,such as aerobic exercise,acousto-optic stimulation,and olfactory stimulation,have shown limited capacity to improve neurogenesis and cognitive function in patients with Alzheimer's disease,the therapeutic effect of a strategy that combines these interventions has not been fully *** this study,we observed an age-dependent decrease in adult neurogenesis and a concurrent increase in amyloid-beta accumulation in the hippocampus of amyloid precursor protein/presenilin 1 mice aged 2-8 *** deposition became evident at 4 months,while neurogenesis declined by 6 months,further deteriorating as the disease ***,following a 4-week multifactor stimulation protocol,which encompassed treadmill running(46 min/d,10 m/min,6 days per week),40 Hz acousto-optic stimulation(1 hour/day,6 days/week),and olfactory stimulation(1 hour/day,6 days/week),we found a significant increase in the number of newborn cells(5'-bromo-2'-deoxyuridine-positive cells),immature neurons(doublecortin-positive cells),newborn immature neurons(5'-bromo-2'-deoxyuridine-positive/doublecortin-positive cells),and newborn astrocytes(5'-bromo-2'-deoxyuridine-positive/glial fibrillary acidic protein-positive cells).Additionally,the amyloid-beta load in the hippocampus *** findings suggest that multifactor stimulation can enhance adult hippocampal neurogenesis and mitigate amyloid-beta neuropathology in amyloid precursor protein/presenilin 1 ***,cognitive abilities were improved,and depressive symptoms were alleviated in amyloid precursor protein/presenilin 1 mice

关键词： acousto-optic stimulation adult neurogenesis Alzheimer's disease amyloid precursor protein/presenilin 1 mice amyloid-beta deposition brain cell apoptosis cognitive impairment depression-like behavior involuntary treadmill exercise olfactory stimulation serum metabolites

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翻译课及其他——爱荷华大学作家工作坊见闻

当代文坛 2025年第1期 103-109页

作者：张楚天津市作家协会

通过作者参加爱荷华大学作家工作坊(Iowa Writers’Workshop)两堂英语翻译课的经历,真实、细致地记录了该校作家工作坊的授课方式和特点,进而延宕到作家工作坊的创办历史、招生方式、教学内容等具体情况。通过工作坊的课程安排与国内高... 详细信息

通过作者参加爱荷华大学作家工作坊(Iowa Writers’Workshop)两堂英语翻译课的经历,真实、细致地记录了该校作家工作坊的授课方式和特点,进而延宕到作家工作坊的创办历史、招生方式、教学内容等具体情况。通过工作坊的课程安排与国内高校创写专业课程的比较,从小切口反思了中外创意写作教学中存在的一些共性问题和个性问题,并对中外地域性写作做了剖析,一方面地域性写作的共性叙事主题与美学风格在不断彰显中呈现出新的气象,超越了个体表达的局限性。另外一方面,对写作者按地域分类忽略了小说作为一种艺术表达方式的个性。

关键词：作家工作坊创意写作地域性写作

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