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Journal of Iron and Steel Research International 2021年第2期28卷 181-189页

作者： Bing-qian Jin nan-nan zhang Yue zhang De-yuan Li Department of Material Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina Provincial Key Laboratory of Advanced Welding Technology and Automation Shenyang 110870LiaoningChina

The low valence electron concentration(VEC)Al_(x)CoCrFeNiSi(x=0.5,1.0,1.5 and 2.0)high-entropy alloys(HEAs)were designed by the fundamental properties of the constituent elements and prepared by vacuum arc melting *** effects of Al addition on the crystal structure and microstructure were *** microhardness and wear property were also *** results showed that the microstructure transformed from dendritic crystal to equiaxed *** was found that FCC phase gradually decreased with the increasing Al content and disappeared until in a composition of 1.0 in Al_(x)CoCrFeNiSi *** FCC phase was found with continuously adding Al,while the phase fraction of BCC increased from 85.0% to 91.8%,and VEC decreased from 7.00 to *** microhardness was increased gradually from 598 up to 909 HV with addition of Al from 0.5 to *** was the same of the compressive strength results,which improved from 1200 to 1920 *** wear coefficient and mass loss were in line with mechanical properties evolution,which was attributed to the microstructure transformation into equiaxed crystal and the increase in BCC phase.

关键词： High-entropy alloy Valence electron concentration Microstructure Phase assemblage Wear resistance

Effect of vanadium addition on microstructure and properties of AI_(0.5)Cr_(0.9)FeNi_(2.5)multi-principal alloys

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Journal of Iron and Steel Research International 2021年第5期28卷 586-596页

作者： De-xi Hao nan-nan zhang Yue zhang De-yuan Li Department of Material Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina Provincial Key Laboratory of Advanced Welding Technology and Automation Shenyang 110870LiaoningChina

AI_(0.5)Cr_(0.9)FeNi_(2.5)V_(x)(x=0,0.2,0.4,0.6,0.8,1.0)multi-principal alloys were prepared by vacuum arc *** effect of vanadium addition on its microstructure and properties was *** results show that the alloys of all components exhibited an FCC single-phase *** the addition of vanadium,the microstructure of the alloy changed from dendrites to equiaxed crystals,the grains were remarkably refined,and the layered CrV phase was exhibited,which improved the properties of the *** yield strength of the alloy was slightly improved,and the alloys with various components presented good *** V content reached 0.8,the yield strength was 600 MPa,and no fracture ***-wear testing showed that the wear debris was reduced with the addition of V *** sample with V element content of 0.4 had the best friction and wear *** surface grooves became shallow,the worn debris was less,and the wear mechanism was mainly abrasive *** polarisation curve showed that the alloy with V element content of 0.2 has the best corrosion *** passivation interval reached 900 *** corrosion potential and the corrosion current density were-496.299 mV and 2.759μA/cm^(2),respectively.

关键词： Multi-principal alloy Vacuum arc melting CrV phase Adhesive wear Electrochemical testing

Tribological properties of FeCoCrNiAlB_x high-entropy alloys coating prepared by laser cladding

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Journal of Iron and Steel Research International 2017年第2期24卷 184-189页

作者： Dan-yang Lin nan-nan zhang Bin He Guang-wei zhang Yue zhang De-yuan Li Department of Material Science and Engineering Shenyang University of Technology Hardface Technology Institute Dalian Huarui Heavy Industrial Special Spare Parts Co.Ltd.

FeCoCrNiA1Bx（x=0, 0.25, 0.50, 0.75） coatings were prepared by laser cladding to study the effects of boron on the structure and properties of high-entropy alloys coatings. The microstructure, microhardness, and wear resistance properties of the samples were investigated by scanning electron microscopy, X-ray diffraction, metallographic micro-hardness test, and friction wear test, respectively, and the mechanism of the wear behavior was also analyzed. The results showed that the high-entropy alloys consisted of BCC phase and eutectic structure, which contained FCC phase and M2B. With boron addition, the content of BCC phase increased while that of eutectic structure decreased. The wear resistance of the high-entropy coatings was considerably improved with increasing addition of horon, and accordingly, the FeCoCrNiAlB0.75 coating showed the best wear resistance.

关键词： Laser cladding High-entropy alloys coating Tribological property FeCoCrNiAlBx

Wear Mechanism of Iron-based Alloy Coating by Arc Spraying

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Journal of Iron and Steel Research International 2016年第8期23卷 834-841页

作者： Zeng-rong LI De-yuan LI nan-nan zhang He HUANG Xin WANG School of Materials Science and Engineering Shenyang University of Technology School of Mechanical Science and Engineering Shenyang Ligong University

The arc spraying technique was adopted to prepare three types of iron-based coatings including 08Mn2 Si,4Cr13,and 65 ***,the metallurgical microscope and scanning electron microscope（SEM）were used to analyze the microstructure of these ***,a DPT-5dye penetrant was painted on the surface of the coatings to simulate the oil fluid,so as to observe its penetration in the pore *** MMU-5Gend-face hightemperature wear tester was used to carry out wear-resistance tests on these coatings and give comparison with grey cast *** experimental results showed that the 4Cr13 coating exhibited the best wear resistance under oil batch lubrication *** to the study of these coating structures,it was discovered that three coatings presented topology-like structures due to the accumulation of flat particles on the ***,it was found that zonal oxides were mixed in particles with some unmolten particles,pores,and ***,the larger pores were mutually connected by gap-like *** existence of FeO in the coating and the pore structures keep oil in acted antifriction effects.

关键词： spraying pores tester metallurgical topology hardness friction penetration prepare aluminium

Influence of laser re-melting and vacuum heat treatment on plasma-sprayed FeCoCrNiAl alloy coatings

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Journal of Iron and Steel Research International 2017年第12期24卷 1199-1205页

作者： Dan-yang Lin nan-nan zhang Bin He Bing-qian Jin Yue zhang De-yuan Li Fu-yu Dong Department of Material Science and Engineering Shenyang University of Technology Department of Pipeline Shenyang Institute of Special Equipment Inspection & Research

FeCoCrNiAl high entropy alloy coatings were prepared by supersonic air-plasma *** coatings were post-treated by vacuum heat treatment at 600 and 900°C,and laser re-melting with 300 W,respectively,to study the influence of different treatments on the structure and properties of the *** phase constitution,microstructure and microhardness of the coatings after treatments were investigated using X-ray diffraction,scanning electron microscopy and energy dispersive *** showed that the as-sprayed coatings consisted of pure metal and *** AlNi;phase was obtained after the vacuum heat treatment process.A body-centered cubic structure with less AlNi;could be found in the coating after the laser re-melting *** average hardness values of the as-sprayed coating and the coatings with two different temperature vacuum heat treatments and with laser re-melting were 177,227,266 and 682 HV,*** suggests that the vacuum heat treatment promoted the alloying process of the coatings,and contributed to the enhancement of the coating wear *** laser re-melted coating showed the best wear resistance.

关键词： Plasma spray High entropy alloy Vacuum heat treatment Laser re-melting FeCoCrNiAl alloy coating

In-flight particle characterization and coating formation under low pressure plasma spray condition

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Journal of Iron and Steel Research International 2017年第3期24卷 306-312页

作者： nan-nan zhang Dan-yang Lin Ya-li Li Yue zhang Marie-pierre Planche Han-lin Liao Christian Coddet Fu-yu Dong Department of Material Science and Engineering Shenyang University of Technology IRTES-LERMPS University of Technology of Belfort-Montbeliard

Yttria-stabilized zirconia（ YSZ） coatings were deposited by low pressure plasma spray（ LPPS） in 1.0× 10^4 Pa,1.5 × 10^4 Pa,and 2.5 × 10^4 Pa. Both in-flight particle diagnostic detected by DPV-2000 system and ANSYS-FLUENT software were used to study the connection between the parameters of flying particles and the coating formation,which might help to recognize the relationship between the operation parameters and the coatings quality. The results of simulation showed that particles in a lower spray pressure could achieve a higher velocity. The particle velocity was around 380 m/s at a distance of 35 cm from the nozzle at 1.0 × 10^4 Pa while only 300 m/s at 2.5 × 10^4 Pa in actual *** results showed that the velocity of particles increased with decreasing the spray pressure,which might enhance the flattening rate of coatings and thereby decreased the porosity. The deposited YSZ coating with the lowest porosity can be gained under 1.0 × 10^4 Pa condition.

关键词： In-flight particle detection Low pressure plasma spray Yttria-stabilized zirconia coating Flame simulation

Effect of Mg addition on temper embrittlement in 2.25Cr–1Mo steel doped with 0.056% P–Mg segregation behavior at grain boundary

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Journal of Iron and Steel Research International 2021年第10期28卷 1259-1267页

作者： Xiao-bing Li Xin Dong Peng-xiang Zhao Wei-wei Xing Lei-lei Ding nan-nan zhang Ying-che Ma Kui Liu Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of ScienceShenyang110016LiaoningChina CAS Key Laboratory of Nuclear Materials and Safety Assessment Shenyang110014LiaoningChina School of Materials Science and Engineering Shenyang University of TechnologyShenyang110870LiaoningChina School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026AnhuiChina

To verify the microalloying function and segregation behavior of trace Mg at grain boundary in steel,the 2.25Cr–1Mo steel doped with 0.056%P containing different Mg contents was refined with a vacuum-induction *** effects of trace Mg addition on the temper embrittlement susceptibility of 2.25Cr–1Mo steel were studied by step-cooling test and the segregation behavior of Mg at grain boundary was explored by Auger electron *** is shown that P-induced temper embrittlement susceptibility can be reduced after subjecting to step-cooling treatment with trace Mg addition,mainly benefited from the segregation of Mg at grain *** segregation can decrease the segregation amounts of P and S,especially for P,and increase the grain boundary cohesion,reducing the adverse effect on temper embrittlement caused by P and S.

关键词： 2.25Cr-1Mo steel Temper embrittlement Mg P Segregation Auger electron spectroscopy

Value of ultrasound and magnetic resonance imaging combined with tumor markers in the diagnosis of ovarian tumors

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World Journal of Clinical Cases 2023年第31期11卷 7553-7561页

作者： Qian Yang Hui zhang Pei-Qi Ma Bin Peng Gui-Tao Yin nan-nan zhang Hai-Bao Wang The First Affiliated Hospital of Anhui Medical University Hefei 230022Anhui ProvinceChina Taihe Hospital of Traditional Chinese Medicine Fuyang 236000Anhui ProvinceChina Fuyang People’s Hospital Fuyang 236000Anhui ProvinceChina No.2 People’s Hospital of Fuyang City Fuyang 236000Anhui ProvinceChina Linquan People’s Hospital Fuyang 236000Anhui ProvinceChina

BACKGROUND Compare the diagnostic performance of ultrasound(US),magnetic resonance imaging(MRI),and serum tumor markers alone or in combination for detecting ovarian *** To investigate the diagnostic value of US,MRI combined with tumor markers in ovarian *** The data of 110 patients with ovarian tumors,confirmed by surgery and pathology,were collected in our hospital from February 2018 to May *** dataset included 60 cases of benign tumors and 50 cases of malignant *** to surgery,all patients underwent preoperative US and MRI examinations,as well as serum tumor marker tests[carbohydrate antigen 125(CA125),human epididymis protein 4(HE4)].The aim of the study was to compare the diagnostic performance of these three methods individually and in combination for ovarian *** This study found statistically significant differences in the ultrasonic imaging characteristics between benign and malignant *** differences include echo characteristics,presence or absence of a capsule,blood flow resistance index,clear tumor shape,and blood flow signal display rate(Pnant tumors(Pnant tumors showed significant statistical differences(Pnant tumors(P<0.05).The combined use of US,MRI,and tumor markers in the diagnosis of ovarian tumors demonstrates higher accuracy,sensitivity,and specificity compared to using each method individually(P<0.05).CONCLUSION US,MRI,and tumor markers each have their own advantages and disadvantages when it comes to diagnosing ovarian ***,by combining these three methods,we can significantly enhance the accuracy of ovarian tumor diagnosis,enabling early detection and identification of the tumor’s natur

关键词： Ovarian tumors Ultrasound Magnetic resonance imaging Tumor markers Differential diagnosis

Clinical significance of skip lymph-node metastasis in pN1 gastric-cancer patients after curative surgery

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Gastroenterology Report 2019年第3期7卷 193-198,I0002页

作者： Jin-Yuan Liu Jing-Yu Deng nan-nan zhang Hui-Fang Liu Wei-Lin Sun Wen-Ting He Yan Wang Li zhang Han Liang Department of Gastroenterology Tianjin Medical University Cancer HospitalCity Key Laboratory of Tianjin Cancer Center and National Clinical Research Center for CancerTianjinP.R.China Department of General Surgery The Affiliated Hospital of Nankai UniversityTianjinP.R.China

Background:In addition to the stepwise manner of lymph-node metastasis from the primary tumour,the skip lymph-node metastasis(SLNM)was identified as a low-incidence metastasis of gastric cancer(GC).So far,both the mechanism and outcome of SLNM have not been elucidated *** purpose of this study was to analyse the clinical significance and the potential mechanism of SLNM in GC patients who had lymph-node ***:Clinicopathological data and follow-up information of 505 GC patients who had lymph-node metastasis were analysed to demonstrate the significance of SLNM in evaluating the prognostic *** to the pathological results,all GC patients who had lymph-node metastasis were categorized into three groups:patients with the perigastric lymphnode metastasis,patients with the perigastric and extragastric lymph-node metastasis and patients with ***:Among the 505 GC patients who had lymph-node metastasis,24(4.8%)had pathologically identified *** location of lymph-node metastasis was not significantly associated with 5-year survival rate and overall survival(OS)(P=0.194).The stratified survival analysis results showed that the status of SLNM was significantly associated with the OS in patients with pN1 GC(P=0.001).The median OS was significantly shorter in 19 pN1 GC patients with SLNM than in 100 patients with perigastric lymph-node metastasis(P<0.001).The case–control matched logistic regression analysis results showed that tumour size(P=0.002)was the only clinicopathological factor that may predict SLNM in pN1 GC patients undergoing curative *** the 19 pN1 GC patients with SLNM,17(89.5%)had metastatic lymph nodes along the common hepatic artery,around the celiac artery or in the hepatoduodenal ***:SLNM may be considered a potentially practicable indicator for prognosis among various subgroups of pN1 GC patients.

关键词： Stomach neoplasm metastasis prognosis multivariate analysis

Molecular phylogenetic relationships based on mitochondrial genomes of novel deep-sea corals(Octocorallia:Alcyonacea):Insights into slow evolution and adaptation to extreme deep-sea environments

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Zoological Research 2024年第1期45卷 215-225页

作者： Zhan-Fei Wei Kai-Wen Ta nan-nan zhang Shan-Shan Liu Liang Meng Kai-Qiang Liu Chong-Yang Cai Xiao-Tong Peng Chang-Wei Shao National Key Laboratory of Mariculture Biobreeding and Sustainable Goods Yellow Sea Fisheries Research InstituteChinese Academy of Fishery SciencesQingdaoShandong 266071China BGI-Qingdao BGI-ShenzhenQingdaoShandong 266555China Institute of Deep-Sea Science and Engineering Chinese Academy of SciencesSanyaHainan 572000China

A total of 10 specimens of Alcyonacea corals were collected at depths ranging from 905 m to 1633 m by the manned submersible Shenhai Yongshi during two cruises in the South China Sea(SCS).Based on mitochondrial genomic characteristics,morphological examination,and sclerite scanning electron microscopy,the samples were categorized into four suborders(Calcaxonia,Holaxonia,Scleraxonia,and Stolonifera),and identified as 9 possible new cold-water coral *** of GC-skew dissimilarity,phylogenetic distance,and average nucleotide identity(ANI)revealed a slow evolutionary rate for the octocoral mitochondrial *** nonsynonymous(Ka)to synonymous(Ks)substitution ratio(Ka/Ks)suggested that the 14 protein-coding genes(PCGs)were under purifying selection,likely due to specific deep-sea environmental *** analysis of the median Ka/Ks values of five gene families and environmental factors indicated that the genes encoding cytochrome b(cyt b)and DNA mismatch repair protein(mutS)may be influenced by environmental factors in the context of deep-sea species *** study highlights the slow evolutionary pace and adaptive mechanisms of deep-sea corals.

关键词： Mitochondrial genome Alcyonacea Ka/Ks evolution Environmental factors