检索结果-南通市图书馆

cavitation erosion resistance of 316L stainless steel fabricated using selective laser melting

在线全文

学校读者我要写书评

暂无评论

Friction 2021年第6期9卷 1580-1598页

作者： Hongqin DING Qing TANG Yi ZHU Chao ZHANG Huayong YANG State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China Ningbo Research Institute Zhejiang UniversityNingbo 315100China

cavitation erosion degrades the performance and reliability of hydraulic *** laser melting(SLM)is a type of metal additive manufacturing technology that can fabricate metal parts directly and provide lightweight design in various industrial ***,the cavitation erosion behaviors of SLM-fabricated parts have rarely been *** this study,SLM 316L stainless steel samples were fabricated via SLM technology considering the scanning strategy,scanning speed,laser power,and build *** effect of the process parameters on the cavitation erosion resistance of the SLM-fabricated 316L stainless steel samples was illustrated using an ultrasonic vibratory cavitation *** mass loss and surface topography were employed to evaluate the surface cavitation damage of the SLM-fabricated 316L stainless steel samples after the cavitation *** cavitation damage mechanism of the SLM-fabricated samples was *** results show that the degree of cavitation damage of the sample fabricated via SLM with a few defects,anisotropic build direction,and columnar microstructure is significantly *** such as pores,which are attributed to low laser power and high scanning speed,may severely aggravate the cavitation damage of the SLM-fabricated *** sample fabricated via SLM with a low laser power and exposure time exhibited the highest porosity and poor cavitation erosion *** cellular structures are more prone to cavitation damage compared with the columnar structures.A sample with a high density of grain boundaries will severely suffer cavitation damage.

关键词： selective laser melting stainless steel cavitation erosion process parameters microstructure

cavitation erosion Behavior of CrMnN Duplex Stainless Steel in Distilled Water and 3% NaCl Solution

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2003年第4期19卷 346-350页

作者： Suzhen LUO, Yugui ZHENG, Wei LIU, Heming JING, Zhiming YAO and Wei KEState Key Laboratory for Corrosion and Protection, Institute of Metai Research, Chinese Academy of Sciences, Shenyang 110016, China Lab. for Corrosion and Protection Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The cavitation erosion (CE) behavior of CrMnIM ferrite-austenite duplex stainless steel in distilled water and 3% NaCI solution was investigated by using a magnetostrictive-induced CE facility. The damaged surfaces were observed by scanning electron microscope (SEM). It was found that the CE resistance of CrMnN steel was higher than that of OCrl3Ni5Mo steel. The mass loss rate of CrMnN steel in distilled water was similar to that in 3% NaCI except at the early stage of CE. The failure mode of ferrite phase was brittle fracture, which had adverse effect on the resistance to CE, while the failure of austenite phase was a ductile failure in CrMnN steel. The excellent resistance to CE was related to the good mechanical properties of austenitic phase and the consumption of CE energy by plastic deformation involving slip and twinning.

关键词： cavitation erosion CrMnN duplex stainless steel Microstructure Ferrite Austenite Plastic deformation

cavitation erosion Behavior of as-Welded Cu12Mn8Al3Fe2Ni Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2004年第3期20卷 304-306页

作者： XiaoyaLI YongguiYAN ZhenmingXU JianguoLI StateKeyLabofMetalMatrixComposites ShanghaiJiaoTongUniversityShanghai200030China StateKeyLabforMarineCorrosionandProtection LuoyangShipMaterialsResearchInstituteQingdaoBranchQingdao266071China

cavitation erosion behavior of as-welded Cu12Mn8Al3Fe2Ni alloy in 3.5% NaCl aqueous solution was studied bymagnetostrictive vibratory device for cavitation erosion. The results show that the cavitation erosion resistance ofthe as-welded Cu12Mn8Al3Fe2Ni alloy is much more superior to that of the as-cast one. The cumulative mass lossand the mass loss rate of the as-welded Cu12Mn8Al3Fe2Ni alloy are almost 1/4 that of the as-cast one. SEM analysisof eroded specimens reveals that the as-cast Cu12Mn8Al3Fe2Ni alloy is attacked more severely than the as-weldedone. Microcracks causing cavitation damage initiate at the phase boundaries.

关键词： Cu12Mn8Al3Fe2Ni alloy Tungsten inert gas welding (TIG) cavitation erosion

cavitation erosion behavior of WC coatings on CrNiMo stainless steel by laser alloying

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2009年第2期16卷 203-207页

作者： Xiao-bin Zhang Chang-sheng Liu Xiao-dong Liu Jiang Dong Bo Yu School of Materials and Metallurgy Northeastern University Shenyang 110004 China School of Material Science and Engineering Chongqing Institute of Technology Chongqing 400050 China Shenyang Research Institute of Foundry Shenyang 110022 China

The WC powder was precoated on the surface of CrNiMo stainless steel and then made into an alloying layer by using the laser alloying technique. Phases in the layers were investigated by X-ray diffraction （XRD） analysis and surface morphologies after cavitation erosion were observed with the help of scanning electron microscopy （SEM）. The cavitation erosion behavior of the CrNiMo stainless steel and WC laser alloying layer in distilled water was tested with the help of ultrasonic vibration cavitation erosion equipment. The results showed that the thickness of the laser alloying layer was about 0.13 mm. The layer had a dense microstructure, metallurgically bonded to the substrate, and no crack had been found. The cavitation erosion mass loss rate of the laser alloying layer was only 2/5 that of the CrNiMo stainless steel. The layer had better cavitation resistance properties because of its metallurgical combination and the strengthening effects of the precipitate phases.

关键词： martensite stainless steel laser surface alloying cavitation erosion WC

Microstructure and cavitation erosion behavior of sputtered NiCrAlTi coatings with and without N incorporations

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第19期54卷 211-222页

作者： Zhengliang Liu Shenglong Zhu Mingli Shen Yixuan Jia Wen Wang Fuhui Wang School of Materials Science and Engineering University of Science and Technology of Chin1Hefei 230000China Corrosion and Protection Division Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China Corrosion and Protection Division Shenyang National Laboratory for Materials ScienceSchool of Materials Science and EngineeringNortheastern University110819 ShenyangChina

The NiCrAlTi coatings free of N and with N incorporations were deposited on austenitic stainless steel304 L by magnetron sputtering in Ar and in gas mixture of Ar and N2,*** N incorporated in the coatings existed as nitride precipitates(from^3 vol.%to^17 vol.%)after vacuum *** the NiCrAlTi coatings,whatever free of N or with N incorporations,exhibited better resistance against cavitation erosion than ion plating Ti N coating and the substrate 304 L in ultrasonic cavitation *** NiCrAlTi coating free of N incorporation presents superior cavitation erosion ***,the nitrogen incorporation within the NiCrAlTi coatings showed negative effects on the resistance against cavitation erosion.

关键词： cavitation erosion NiCrAlTi(N)coating Microstructure Nitride precipitate

Corrosion and cavitation erosion Behaviours of Cast Nickel Aluminium Bronze in 3.5% NaCl Solution with Different Sulphide Concentrations

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2019年第12期32卷 1470-1482页

作者： Qi-Ning Song Nan Xu Yao Tong Chen-Ming Huang Shou-Yu Sun Chen-Bo Xu Ye-Feng Bao Yong-Feng Jiang Yan-Xin Qiao Zhi-Yuan Zhu Zheng-Bin Wang College of Mechanical and Electrical Engineering Hohai University200 Jinling North RoadChangzhou 213022China College of Materials Science and Engineering Jiangsu University of Science and Technology2 Mengxi RoadZhenjiang 212003China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of Sciences62 Wencui RoadShenyang 110016China

The effect of sulphide(Na2S)concentration(SC)on the corrosion and cavitation erosion behaviours of a cast nickel aluminium bronze(NAB)in 3.5% NaCl solution is investigated in this *** results show that when the SC exceeds 50 ppm,the hydrogen evolution reaction dominates the cathodic process,and a limiting current region appears in the anodic branch of the polarisation curve due to the formation of a copper sulphide film,which is a diffusion-controlled *** longterm immersion,the increased mass loss rate of NAB with the sulphide additions of 20 and 50 ppm is attributed to the less protective films,which contains a mixture of copper oxides and ***,NAB undergoes severe localised corrosion(selective phase corrosion,SPC)at the β’phases and eutectoid microstructureα+κⅢ.By comparison,NAB undergoes general corrosion and a copper sulphide film is formed in 100 and 200 ppm sulphide *** erosion greatly increases the corrosion rate of NAB in all solutions and causes a negative potential shift in 3.5%NaCl solution due to the film ***,a positive potential shift occurs in the solutions with SC higher than 50 ppm due to the accelerated mass transfer of the cathodic *** cavitation erosion mass loss rate of NAB increases with the increase of *** occurrence of severe SPC decreases the phase boundary cohesion and causes brittle fracture under the cavitation *** corrosion-enhanced erosion is the most predominant factor for the cavitation erosion damage when the SC exceeds 50 ppm.

关键词： Nickel aluminium bronze Sulphide Corrosion cavitation erosion Synergy

Numerical study on fatigue damage properties of cavitation erosion for rigid metal materials

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2008年第3期15卷 261-266页

作者： Guogang Wang Guang Ma Dongbai Sun Hongying Yu Huimin Meng School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Power Station Technology Division China Electric Power Research Institute Beijing 100070 China

cavitation erosion is an especially destructive and complex phenomenon. To understand its basic mechanism, the fatigue process of materials during cavitation erosion was investigated by numerical simulation technology. The loading spectrum used was generated by a spark-discharged electrode. Initiation crack life and true stress amplitude was used to explain the cavitation failure period and damage mechanism. The computational results indicated that the components of different materials exhibited various fatigue lives under the same external conditions. When the groove depth was extended, the initiation crack life decreased rapidly, while the true stress amplitude was increased simultaneously. This gave an important explanation to the accelerating material loss rate during cavitation erosion. However, when the groove depth was fixed and the length varied, the fatigue life became complex, more fluctuant than that happened in depth. The results also indicate that the fatigue effect of cavitation plays an important role in contributing to the formation and propagation of characteristic pits.

关键词： cavitation erosion microjet numerical simulation fatigue analysis crack initiation loading spectrum

Investigation of cavitation erosion caused by laser-induced single bubble collapse near alloy coating surface

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2023年第5期35卷 876-886页

作者： Hai-gang Wen Zhi-feng Yao Qin Wu Yu-rong Sun Chen-xi Yang Qiang Zhong College of Water Resources and Civil Engineering China Agricultural UniversityBeijing100083China Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System China Agricultural UniversityBeijing100083China School of Mechanical Engineering Beijing Institute of TechnologyBeijing100081China

To investigate the mechanism of cavitation erosion caused by laser-induced single bubble near the surface coating alloy coating material, we utilized a nanosecond resolution photography system based on a Q-switched Nd: YAG laser and conventional industrial camera to carefully observe the transient process of bubble collapse under different conditions. We analyzed the generation of collapse microjets and the emission of collapse shock waves and explored the cavitation erosion characteristics caused by laser-induced single bubble collapse. We discovered that even on surfaces of highly hard and corrosion-resistant alloy coatings, severe cavitation erosion occurred, and there was a phenomenon of mismatch between the cavitation erosion location and the bubble projection position. The intensity of cavitation erosion depended on the energy self-focusing effect of the collapse shockwaves. In the experiments, we also observed the self-focusing phenomenon of collapse shockwaves under different conditions. The self-focusing effect of collapse shockwaves weakened as the distance between the bubble and the material surface increased, which may be the cause of cavitation erosion induced by a laser-induced single bubble.

关键词： cavitation erosion bubble collapse laser-induced shock wave self-focusing effect

Laser cladding of NiCrSiB on Monel 400 to enhance cavitation erosion and corrosion resistance

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2022年第12期41卷 4257-4265页

作者： Chun-Hua Zhang Chen-Liang Wu Song Zhang Yong-Feng Jia Meng Guan Jun-Zhe Tan Bin Lin School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Nuclear Power Pump Industry Co. Ltd.Shenyang Blower Works Group CorporationShenyang 110869China

NiCrSiB modified layer was synthesized on Monel 400 by laser cladding,aiming at improving cavitation erosion and corrosion *** microstructure,chemical composition,phase constituents and microhardness were investigated using scanning electron microscope(SEM),energy-dispersive spectrometer(EDS),X-ray diffractometry(XRD) and microhardness *** cavitation erosion and corrosion behaviors of the modified layer were also evaluated using an ultrasonic vibrator and potentiodynamic polarization measurement,*** results show that by varying the laser fluence,a hard NiCrSiB modified layer with little airholes,cracks or other defects could be *** modified layer is ~1.1 mm in *** microstructure of the modified layer exhibits cellular dendrite,flake-like dendrite and multiple eutectic *** modified layer is mainly composed of γ-Ni solid solution,chromium carbide(Cr_(7)C_(3)and Cr_(23)C_(6)) and Ni_(3)*** microhardness of the modified layer is ~6.8 times that of Monel 400 *** the cavitation erosion and corrosion resistance of the modified layer are *** the cavitation erosion test,the cumulative erosion loss and erosion loss rate of the modified layer are one order of magnitude lower than that of the *** the electrochemical corrosion test,the corrosion potentials of the substrate and the modified layer are *** corrosion current densities of the substrate and the modified layer are 11.12 and 1.95 μA·cm^(-2),*** comparing their corrosion current densities,the corrosion resistance of the modified layer is about 5.7 times that of the substrate.

关键词： NiCrSiB Laser cladding Microstructure cavitation erosion Corrosion