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Carbides precipitation and their evolution of Cr15Co10Mo5-alloyed heat-resistant bearing steel after tempering at different temperatures

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Journal of Iron and Steel Research International 2019年第10期26卷 1096-1105页

作者： mao-guo Xiao Xin-yang Lü Dong-hui Li Shao-hong Li Kun-yu Zhao mao-sheng yang School of Material Science and Engineering Kunming University of Science and TechnologyKunming 650093YunnanChina Institute for Special Steels Central Iron and Steel Research InstituteBeijing 100081China

The carbides precipitation and their evolution at elevated tempering temperature in Crl5Col0Mo5-alloyed heat-resistant bearing steel were investigated by means of the transmission electron *** results show that there is no carbide precipitated from the martensitic matrix when the sample was tempered at 480℃.However,when the sample was tempered at 540℃,a large number of stable spherical M6C carbides precipitated in the test ***,there are three types of carbides precipitated from the matrix including M6C,M2C and M23C6 carbides when the tempering temperature reached 600℃.The mechanical properties also present a correlation with the evolution of carbides during tempering at different *** indicates that the strengthening mechanism of the steel is mainly attributed to the precipitation of carbides and their evolution,including the morphologies and types of carbides at different *** addition,the austenitic layers with a thickness of about 30 nm have been obtained between the martensite laths after tempering at 600℃.The austenitic layers will produce transformation-induced plasticity effects to improve the toughness of the steel.

关键词： High-temperature bearing steel Carbide evolution Phase diagram Diffusion coefficient Secondary hardening Austenitic layer

Wear Behavior and Mechanism of a Sliding Pair of 0.1C-3Cr-2W-V Nitrided Steel Rubbing against an Aluminum Bronze Alloy

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Journal of Iron and Steel Research International 2016年第3期23卷 281-288页

作者： Guang-hong WANG sheng-guan QU Zhi-hua XIONG Fu-qiang LAI Xiao-qiang LI mao-sheng yang School of Mechanical and Automotive Engineering South China University of Technology Institute of Special Steel Central Iron and Steel Research Institute

Wear behavior and mechanism of plasma nitrided steel oscillating against a heat-treated and an untreated aluminum bronze alloy were investigated using an Optimol SRV *** influence of heat treatment on the mechanical properties of the alloy was ***,the wear debris was also examined to understand the wear *** results show that a 220-230μm nitrided layer,which was harder than the substrate,was obtained on the steel *** tensile strength and hardness of the alloy are found to be significantly improved by the heat treatment associated with low impact *** heat treatment of the alloy did not obviously decrease the friction coefficient of the nitrided steel-bronze ***,the wear loss of the nitrided steel increased when it mated with the treated bronze by a severe three-body *** nitrided steel was mainly damaged by fatigue *** plane contact conditions,the wear debris was mainly generated from the bronze part and can escape from the interface before being oxidized,leading to the phase structure of all the debris being copper rather than copper oxides.

关键词： steel plasma nitriding aluminum bronze sliding wear three-body abrasion

Effects of traditional heat treatment and a novel deep cryogenic treatment on microstructure and mechanical properties of low-carbon high-alloy martensitic bearing steel

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Journal of Iron and Steel Research International 2021年第3期28卷 370-382页

作者： Dong-hui Li Wen-chao He Xu Zhang mao-guo Xiao Shao-hong Li Kun-yu Zhao mao-sheng yang School of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093YunnanChina Institute for Special Steels Central Iron and Steel Research InstituteBeijing100081China

The effects of traditional heat treatment(quenching and then tempering)and deep cryogenic treatment on the microstructure and mechanical properties of a low-carbon high-alloy martensitic bearing steel were studied by Rockwell hardness test,X-ray diffractometry,scanning electron microscopy and transmission electron *** results show that the deep cryogenic treatment promotes the transformation of the retained austenite to martensite during cooling,which leads to the hardness of the sample after deep cryogenic treatment higher than that at the quenched ***,the carbon content in the martensite matrix after different treatments was calculated and the results indicated that deep cryogenic treatment can promote the segregation of carbon atoms in martensite to *** segregated carbon atoms act as and grow into nuclei for the formation of fine carbide particles during subsequent *** this resulted in the fact that the hardness of the tempered experimental steel after deep cryogenic treatment is higher than that without deep cryogenic treatment.

关键词： Heat treatment High-alloy martensitic bearing steel Deep cryogenic treatment Carbide Retained austenite

Effect of deep cryogenic treatment on martensitic lath refinement and nano-twins formation of low carbon bearing steel

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Journal of Iron and Steel Research International 2020年第1期27卷 105-113页

作者： Xin-yang Lü Zhi-wei Wu Xiao He Jun Li Shao-hong Li mao-sheng yang Kun-yu Zhao Faculty of Material Science and Engineering Kunming University of Science and TechnologyKunming 650093YunanChina Institute for Special Steels Central Iron and Steel Research InstituteBeijing 100081China

The effect of heat treatment and deep cryogenic treatment on microstructural evolution of low carbon martensitic bearing steel was *** experimental results showed that the lath martensite was obtained by quenching and a few twins as substructures formed in some martensitic *** rudiment of sub-interfaces of martensitic lath was formed in the highdensity dislocation regions after deep cryogenic treatment;meanwhile,the number of twins increased,especially in the highdensity dislocation *** phenomenon is due to the increase in internal stress caused by cryogenic *** tempering,the rudiment of sub-interface further evolved into the martensitic lath boundary,and thus the original martensitic laths were *** twins formed by cryogenic treatment did not disappear after *** addition,small quantities of annealing twins formed in tempering *** laths morphology and substructures in different stages of the heat and deep cryogenic treatment were observed by tninsmission electron microscopy.

关键词： Low carbon bearing steel-Deep cryogenic treatment Internal stress Sub-interface Nano-twin

Arbuscular mycorrhizal fungi promote functional gene regulation of phosphorus cycling in rhizosphere microorganisms of Iris tectorum under Cr stress

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Journal of Environmental Sciences 2025年第5期151卷 187-199页

作者： Sixi Zhu Huan mao Suxia Sun Xiuqin yang Wei Zhao Luying sheng Zhongbing Chen College of Eco-environment Engineering Guizhou Minzu UniversityThe Karst Environmental Geological Hazard Prevention of Key Laboratory of State Ethnic Affairs CommissionGuiyang 550025China Department of Applied Ecology Faculty of Environmental SciencesCzech University of Life Sciences PragueKamycka 129Praha-Suchdol 16500Czech Republic

The mutualistic symbiotic system formed by clumping arbuscular mycorrhizal fungi(AMF)and plants can remediate heavy metal-contaminated ***,the specific mechanisms underlying the interaction between AMF and inter-root microbial communities,particularly their impact on organic phosphorus(P)cycling,remain *** study investigated the gene regulation processes involved in inter-root soil phosphorus cycling in wetland plants,specifically Iris tectorum,following inoculation with AMF under varying concentrations of chromium(Cr)*** macro-genome sequencing,we analyzed the composition and structure of the inter-root soil microbial community associated with Iris tectorum under greenhouse pot *** results demonstrated significant changes in the diversity and composition of the inter-root soil microbial community following AMF inoculation,with Proteobacteria,Actinobacteria,Chloroflexi,Acidobacteria,and Bacteroidetes being the dominant *** Cr stress,species and gene co-occurrence network analysis revealed that AMF promoted the transformation process of organic phosphorus mineralization and facilitated inorganic phosphorus ***,network analysis of functional genes indicated strong aggregation of(pstS,pstA,pstC,***,phoR,pp-gppA)genes,which collectively enhanced phosphorus uptake by *** findings shed light on the inter-root soil phosphorus cycling process during the co-remediation of Cr-contaminated soil by AMF-Iris tectorum symbiosis,providing valuable theoretical support for the application of AMF-wetland plant symbiosis systems to remediate heavy metal-contaminated soil.

关键词： Metagenome Arbuscular mycorrhizal fungi Phosphorus Iris tectorum Cr

MXene Hybridized Polymer with Enhanced Electromagnetic Energy Harvest for Sensitized Microwave Actuation and Self‑Powered Motion Sensing

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Nano-Micro Letters 2025年第3期17卷 265-279页

作者： Yu‑Ze Wang Yu‑Chang Wang Ting‑Ting Liu Quan‑Liang Zhao Chen‑Sha Li mao‑sheng Cao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China School of Materials Science and Engineering Peking UniversityBeijing 100871People’s Republic of China School of Mechanical and Material Engineering North China University of TechnologyBeijing 100144People’s Republic of China Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang UniversityHarbin 150080People’s Republic of China

Polymeric microwave actuators combining tissue-like softness with programmablemicrowave-responsive deformation hold great promise for mobile intelligentdevices and bionic soft robots. However, their application is challenged by restricted electromagneticsensitivity and intricate sensing coupling. In this study, a sensitized polymericmicrowave actuator is fabricated by hybridizing a liquid crystal polymer with Ti3C2Tx(MXene). Compared to the initial counterpart, the hybrid polymer exhibits unique spacechargepolarization and interfacial polarization, resulting in significant improvements of230% in the dielectric loss factor and 830% in the apparent efficiency of electromagneticenergy harvest. The sensitized microwave actuation demonstrates as the shortenedresponse time of nearly 10 s, which is merely 13% of that for the initial shape memory polymer. Moreover, the ultra-low content of MXene (upto 0.15 wt%) benefits for maintaining the actuation potential of the hybrid polymer. An innovative self-powered sensing prototype that combinesdriving and piezoelectric polymers is developed, which generates real-time electric potential feedback (open-circuit potential of ~ 3 mV) duringactuation. The polarization-dominant energy conversion mechanism observed in the MXene-polymer hybrid structure furnishes a new approachfor developing efficient electromagnetic dissipative structures and shows potential for advancing polymeric electromagnetic intelligent devices.

关键词： Microwave absorption Electromagnetic response Energy harvest Self-sensing Soft actuator

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肠道菌群微环境与结直肠癌的关系研究进展

世界华人消化杂志 2016年第36期24卷 4759-4765页

作者：秧茂盛周密吉首大学医学院转化医学研究中心湖南省吉首市416000 重庆医科大学附属第一医院药学部重庆市400016

肠道菌群是目前研究的热点领域,现有的研究结果提示:肠道菌群可能与代谢性疾病、免疫性疾病、神经系统疾病、认知与行为失常、癌症等多种疾病相关.本文检索和分析了近10余年来有关肠道菌群及其微环境与结直肠癌(colorectal cancer,CRC)... 详细信息

肠道菌群是目前研究的热点领域,现有的研究结果提示:肠道菌群可能与代谢性疾病、免疫性疾病、神经系统疾病、认知与行为失常、癌症等多种疾病相关.本文检索和分析了近10余年来有关肠道菌群及其微环境与结直肠癌(colorectal cancer,CRC)关系的研究成果,从肠道菌群及其微环境与CRC的定义、健康与CRC状态下的肠道菌群构成、肠道菌群的失调方式、肠道菌群微环境与CRC的相关性、肠道菌群微环境与CRC的病理生理机制等5个方面进行了综述,期望能够为揭示肠道菌群微环境在CRC的发生与发展病理机制中的作用,以及以肠道菌群微环境为靶向的、新的CRC预防和治疗手段的研发提供思路和线索.

关键词：结直肠癌肠道菌群肠道菌群微环境病理机制细菌毒素

Light-activated tautomeric transition enhanced buried heterointerface for highly efficient and ultraviolet robust perovskite solar cells

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Science China Chemistry 2025年第2期68卷 723-732页

作者： sheng Jiang Shaobing Xiong Shuaifei mao Yefan Zhang Dongyang Zhao Xiaomeng You Vladimir Gaishun Dmitry Kovalenk Qinye Bao School of Physics and Electronic Science East China Normal UniversityShanghai 200241China Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Institute of OptoelectronicsFudan UniversityShanghai 200433China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123China Shanghai Key Laboratory of Magnetic Resonance East China Normal UniversityShanghai 200241China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Department of Physics and Information Technologies Francisk Skorina Gomel State UniversityGomel 246028Belarus

The buried heterointerface of perovskite solar cells(PSCs)suffers from serious nonradiative recombination and ultraviolet(UV)light stress,relentlessly limiting further increase in their power conversion efficiency and operational ***,we develop an emerging strategy of incorporating a thin UV-activated tautomeric transition layer onto underlying charge transport layer and then depositing perovskite layer to construct an efficient hole-selective buried *** is revealed that the UV-activated tautomeric transition interlayer not only improves upper perovskite crystallinity,diminishes thermionic loss for collecting hole and passivates defect site at such buried contact that significantly promote charge transport and suppress nonradiative recombination,but also effectively protects adjacent perovskite from UV degradation through“UV sunscreen”*** a result,we report a remarkably enhanced efficiency of 24.76%compared to 22.02%of the control *** importantly,the achieved high-efficiency PSC features excellent resistance against UV radiation at 365 nm of 100 and 850 mW cm^(−2),which are approximately 21 and 184 times of UV flux(4.6 mW cm^(−2))under AM 1.5G solar *** work provides a promising approach of strengthening buried heterointerface for simultaneous realization of highly efficient and UV robust PSCs.

关键词： buried heterointerface energetics nonradiative recombination ultraviolet resistance perovskite solar cell

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World Journal of Gastroenterology 2025年第8期31卷 115-129页

作者： Han Ding Zhi-Guo Ding Song Liu Xu-Nan mao Xing-sheng Lu Department of Endoscopy Center and Endoscopy Research Institute Zhongshan HospitalThe Affiliated to Fudan UniversityShanghai 200032China Department of General Surgery Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092China Department of General Surgery The Third People’s Hospital of YangzhouYangzhou 225126Jiangsu ProvinceChina Department of General Surgery The Fourth Affiliated Hospital of Soochow UniversitySuzhou 215000Jiangsu ProvinceChina Medical College Yangzhou UniversityYangzhou 225009Jiangsu ProvinceChina

BACKGROUND Ras-related protein Rab24,which belongs to the small GTPase family,plays a crucial role in regulating intracellular protein *** of Rab24 has been recently identified in hepatocellular carcinoma(HCC).However,its clinical significance and tumor related effects remain to be further *** To explore the expression pattern of Rab24 and its role in HCC *** The expression profile of Rab24 was tested in HCC tissues together with adjacent tissues from transcriptional,mRNA,and protein *** prognostic role of Rab24 in HCC was assessed by univariate and multivariate *** outcomes were evaluated by the Kaplan-Meier analysis and log-rank *** effect of Rab24 on cell proliferation was tested through cellular experiments and xenograft *** Rab24 expression was elevated in HCC tissues compared to adjacent liver *** expression of Rab24 was significantly associated with larger tumor size and advanced tumor ***,HCC patients with high Rab24 expression showed poorer overall survival,and Rab24 was identified as an independent prognosis factor according to multivariate *** using overexpression and shRNA knockdown strategies in HCC cell lines,we found that Rab24 can promote HCC ***,we validated that silencing Rab24 significantly attenuated xenograft growth in *** Our study demonstrated that high expression of Rab24 was significantly correlated with poorer prognosis of HCC patients,indicating the potential of Rab24 as a novel clinical biomarker and therapeutic target.

关键词： Hepatocellular carcinoma Ras-related protein Rab24 Prognosis Proliferation