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Mechanical performance of 22SiMn2TiB steel welded with lowtransformation- temperature filler wire and stainless steel filler wire

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Journal of Iron and Steel Research International 2024年第4期31卷 967-981页

作者： Zi-dong Lin Kai-jie Song Zhen Sun Zi-qian Zhu Xue-feng Zhao Constantinos Goulas Wei Ya Xing-hua Yu School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China Department of Design Production and Management Faculty of Engineering Technology.University of TwenteEnschede 7500 AETheNetherlands Rotterdam additive manufacture Fieldlab(RAMLAB) Rotterdam 3089 JWTheNetherlands

TX-80 low-transformation-temperature(LTT)welding wire was used to replace the traditional ER 307Si welding wire to realize the connection of 22SiMn2TiB armor steel in manual overlay *** previously existing issues,such as welding cracks,large welding deformation,and severe welding residual stress,were solved to ensure good strength and ductility *** particular,with the same welding conditions,TX-80 LTT wire eliminates welding *** reduces the welding deformation no matter the base pretreatment of pre-setting angle or no pre-setting *** comparison,it was found that the microstructure at the TX-80 weld is mainly composed of martensite and a small amount of retained *** contrast,the microstructure of the ER 307Si weld consists of a large amount of austenite and a small amount of skeleton-like *** variation trend of residual stress and microhardness from the weld to the base were investigated and compared with the mechanical properties of base *** TX-80 and the ER 307Si tensile samples elongation is 6.76%and 6.01%,while the ultimate tensile strengths are 877 and 667 MPa,*** average impact toughness at room temperature of the ER 307Si weld is 143.9 J/cm^(2),much higher than that of the TX-80 weld,which is only 36.7 J/cm^(2).The relationship between impact and tensile properties with microstructure species and distribution was *** addition,the fracture surface of the tensile and the impact samples was observed and *** dimples,fewer pores,larger radiation zone,and shear lips of TX-80 samples indicate better tensile ductility and worse impact toughness than those of ER 307Si weld.

关键词： Low-transformation-temperature material 22SiMn2TiB steel Welding deformation Residual stress Martensitic transformation Mechanical property

Microstructure Characteristics of Inconel 625 Superalloy manufactured by Selective Laser Melting

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Journal of Materials Science & Technology 2015年第9期31卷 946-952页

作者： Shuai Li Qingsong Wei Yusheng Shi Zicheng Zhu Danqing Zhang State Key Laboratory of Die & Mould Technology Huazhong University of Science and Technology ntu additive manufacture centre Nanyang Technological University

Selective laser melting （SLM）, an additive manufacturing process, is capable of manufacturing metallic parts with complex shapes directly from computer-aided design （CAD） models. SLM parts are created on a layer-by-layer manner, making it more flexible than traditional material processing techniques, in this paper, Inconel 625 alloy, a widely used material in the aerospace industry, were chosen as the build material. Scanning electron microscopy （SEM）, electron back scattering diffraction （EBSD） and X-ray diffraction （XRD） analysis techniques were employed to analyze its microstructure. It was observed that the molten pool was composed of elongated columnar crystal, Due to the rapid cooling speed, the primary dendrite arm space was approximately 0.5 μm and the hardness of SLM state was very high （343 HV）. The inverse pole figure （IPF） indicated that the growing orientation of the most grains was 〈001〉 due to the epitaxial growth and heat conduction. The XRD results revealed that the austenite structure with large lattice distortion was fully formed. No carbides or precipitated phases were found. After heat treatment the grains grew into two microstructures with distinct morphological characters, namely, rectangular grains and limited in the molten pool, and equiaxed grains along the molten boundaries. Upon experiencing the heat treatment, MC carbides with triangular shapes gradually precipitated. The results also identified that a large number of zigzag grain boundaries were formed. In this study, the grain formation and microstructure, and the laws of the molten pool evolution were also analyzed and discussed,

关键词： Selective laser meltingNickel based superalloyTextureLattice constantZigzag grain boundary

Effect of thermo-mechanical treatment on microstructure and mechanical properties of wire-arc additively manufactured Al-Cu alloy

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Journal of Central South University 2024年第7期31卷 2181-2193页

作者： ZHANG Tao QIN Zhen-yang GONG Hai WU Yun-xin CHEN Xin Light Alloy Research Institute Central South UniversityChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China Welding and additive Manufacturing centre Cranfield UniversityBedfordMK430ALUK

Wire-arc additive manufacture(WAAM)has great potential for manufacturing of Al-Cu ***,inferior mechanical properties of WAAM deposited material restrict its industrial ***-layer cold rolling and thermo-mechanical heat treatment(T8)with pre-stretching deformation between solution and aging treatment were adopted in this *** effects on hardness,mechanical properties and microstructure were analyzed and compared to the conventional heat treatment(T6).The results show that cold rolling increases the hardness and strengths,which further increase with T8 *** ultimate tensile strength(UTS)of 513 MPa and yield stress(YS)of 413 MPa can be obtained in the inter-layer cold-rolled sample with T8 treatment,which is much higher than that in the as-deposited *** cold-rolled samples show higher elongation than that of as-deposited ones due to significant elimination of porosity in cold rolling;while both the T6 and T8 treatments decrease the *** cold rolling and pre-stretching deformation both contribute to the formation of dense and dispersive precipitatedθ′phases,which inhibits the dislocation movement and enhances the strengths;as a result,T8 treatment shows better strengthening effect than the T6 *** strengthening mechanism was analyzed and it was mainly related to work hardening and precipitation strengthening.

关键词： wire-arc additive manufacture inter-layer cold rolling thermal-mechanical treatment microstructure mechanical properties strengthening mechanism

High strength mullite-bond SiC porous ceramics fabricated by digital light processing

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Journal of Advanced Ceramics 2024年第1期13卷 53-62页

作者： Jian Sun Jingde Zhang Xu Zhang Zihe Li Jianzhang Li Sijie Wei Weibin Zhang Weili Wang Guifang Han Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China Key Laboratory of Special Functional Aggregated Materials Ministry of EducationShandong UniversityJinan 250100China Materials and Structures Research centre Department of Mechanical EngineeringUniversity of BathBath BA27AYUK National Engineering Research centre of Ceramic Matrix Composite manufacture Technology Xi’an Golden Mountain Ceramic Composites Co.Ltd.Xi’an 710118China School of Physics and Materials Science Changji UniversityChangji 831100China

Fabricating SiC ceramics via the digital light processing(DLP)technology is of great challenge due to strong light absorption and high refractive index of deep-colored SiC powders,which highly differ from those of resin,and thus significantly affect the curing performance of the photosensitive SiC *** this paper,a thin silicon oxide(SiO_(2))layer was in-situ formed on the surface of SiC powders by pre-oxidation *** method was proven to effectively improve the curing ability of SiC *** SiC photosensitive slurry was fabricated with solid content of 55 vol%and viscosity of 7.77 Pa·s(shear rate of 30 s^(−1)).The curing thickness was 50μm with exposure time of only 5 ***,a well-designed sintering additive was added to completely convert low-strength SiO_(2) into mullite reinforcement during *** mullite-bond SiC ceramics were successfully *** flexural strength of SiC ceramics sintered at 1550℃in air reached 97.6 MPa with porosity of 39.2 vol%,as high as those prepared by spark plasma sintering(SPS)techniques.

关键词： digital light processing(DLP) SiC ceramics pre-oxidation mullite-bond SiC mechanical properties

Optimization of tribological parameters over WC-12%Co laser alloyedpearlitic ductile iron using Taguchi based Grey relational analysis

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Journal of Central South University 2020年第3期27卷 736-751页

作者： N.JEYAPRAKASH YANG Che-hua TSENG Sheng-po centre of Mass Customization additive manufacture National Taipei University of TechnologyTaiwanChina Institute of Manufacturing Technology National Taipei University of TechnologyTaiwanChina

Pearlitic ductile irons(PDIs)are used in transportation and nuclear energy *** heavy loading situation,the service life of PDI is affected by numerous tribo *** this study,surface of the PDI is alloyed with WC-12%Co powder using a high power fibre *** wear properties of the base material and laser alloying samples were investigated by tribometer with various parameters,i.e.,temperature,load and sliding *** on experimental test,the load has maximum percentage of contribution and followed by sliding speed and working *** optimized tribological parameters by Grey relational analysis(GRA)were established and those values are closely matched with predicted ***,base material and laser alloying surfaces were examined through Vickers hardness machine,scanning electron microscopy(SEM)and roughness *** laser altered specimen shows no defects and improves the wear properties than *** identified optimal tribological parameters are load of 30 N,speed of 0.5 m/s and working temperature of 300℃,and load of 30 N,speed of 0.5 m/s and working temperature of 200℃ for base metal and laser alloying samples,respectively.

关键词： WC-12%Co laser alloying microstructure wear resistance Grey technique analysis of variance optimization roughness

additive manufacturing in radiation oncology:a review of clinical practice,emerging trends and research opportunities

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International Journal of Extreme Manufacturing 2020年第1期2卷 47-66页

作者： Rance Tino Martin Leary Adam Yeo Elizabeth Kyriakou Tomas Kron Milan Brandt RMIT centre for additive manufacture School of EngineeringRMIT UniversityMelbourneAustralia Physical Sciences Department Peter MacCallum Cancer CentreMelbourneAustralia ARC Industrial Transformation Training centre in additive Biomanufacturing Queensland University of TechnologyBrisbaneAustralia centre for Medical Radiation Physics University of WollongongWollongong Australia

The additive manufacturing(AM)process plays an important role in enabling cross-disciplinary research in engineering and personalised *** available clinical tools currently utilised in radiotherapy are typically based on traditional manufacturing processes,often leading to non-conformal geometries,time-consuming manufacturing process and high *** emerging application explores the design and development of patient-specific clinical tools using AM to optimise treatment outcomes among cancer patients receiving radiation *** this review,we:•highlight the key advantages of AM in radiotherapy where rapid prototyping allows for patient-specific manufacture•explore common clinical workflows involving radiotherapy tools such as bolus,compensators,anthropomorphic phantoms,immobilisers,and brachytherapy moulds;and•investigate how current AM processes are exploited by researchers to achieve patient tissuelike imaging and dose ***,significant AM research opportunities in this space are highlighted for their future advancements in radiotherapy for diagnostic and clinical research applications.

关键词： additive manufacturing radiotherapy tools dosimetry EBRT patient-specific cancer treatment quality assurance

Compatibility research of laser additive repairing TA15 forgings with Ti6Al4V-xTA15 alloy

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Journal of Central South University 2021年第4期28卷 1015-1027页

作者： YU Jun SONG Ye-pan LIN Xin CAO Zhen-jie ZENG Quan-ren WANG Jun-jie HUANG Wei-dong State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Metal High Performance additive Manufacturing and Innovative Design MIITNorthwestern Polytechnical UniversityXi’an 710072China Advanced Forming Research centre National Manufacturing InstituteScotland85 Inchinnan DriveRenfrewshire PA49LJUK Department of Design Manufacture and Engineering Management(DMEM)University of Strathclyde75 Montrose Street GlasgowG11XJUK

The application of mixed powders with different mass fraction on laser additive repairing(LAR)can be an effective way to guarantee the performance and functionality of repaired part in time.A convenient and feasible approach is presented to repair TA15 forgings by employing Ti6Al4V-xTA15 mixed powders in this *** performance compatibility of Ti6Al4V-xTA15 powders from the aspects of microhardness,tensile property,heat capacity,thermal expansion coefficient and corrosion resistance with the TA15 forgings was fully *** primaryαlaths were refined and the volume fraction of the secondaryαphase was increased by increasing the mass fraction of TA15 in the mixed Ti6Al4V-xTA15 powders,leading to varied *** conclusion,the mixed Ti6Al4V-70%TA15(x=70%)powders is the most suitable candidate and is recommended as the raw material for LAR of TA15 forgings based on overall consideration of the compatibility calculations of the laser repaired zone with the wrought substrate zone.

关键词： TA15 alloy Ti6Al4V alloy laser additive repairing compatibility

Photopolymerization-based additive manufacturing of ceramics:A systematic review

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Journal of Advanced Ceramics 2021年第3期10卷 442-471页

作者： Sefiu Abolaji RASAKI Dingyu XIONG Shufeng XIONG Fang SU Muhammad IDREES Zhangwei CHEN additive Manufacturing Institute Shenzhen UniversityShenzhen 518060China Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robotics College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China

Conversion of inorganic-organic frameworks (ceramic precursors and ceramic-polymer mixtures) into solid mass ceramic structures based on photopolymerization process is currently receiving plentiful attention in the field of additive manufacturing (3D printing).Various techniques(e.g.,stereolithography,digital light processing,and two-photon polymerization) that are compatible with this strategy have so far been widely *** is due to their cost-viability,flexibility,and ability to design and manufacture complex geometric *** platforms related to these techniques have been developed too,in order to meet up with modem technology *** relevant to this review are the challenges faced by the researchers in using these 3D printing techniques for the fabrication of ceramic *** challenges often range from shape shrinkage,mass loss,poor densification,cracking,weak mechanical performance to undesirable surface roughness of the final ceramic *** is due to the brittle nature of ceramic *** on the summary and discussion on the current progress of material-technique correlation available,here we show the significance of material composition and printing processes in addressing these *** use of appropriate solid loading,solvent,and preceramic polymers in forming slurries is suggested as steps in the right *** are indicated as another factor playing vital roles and their selection and development are suggested as plausible ways to remove these barriers.

关键词： ceramics photopolymerization stereolithography additive manufacturing 3D printing polymer-derived ceramics

Properties of ABS/Organic-Attapulgite Nanocomposites Parts Fabricated by Fused Deposition Modeling

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Journal of Renewable Materials 2020年第11期8卷 1505-1518页

作者： Ling Wang Shenglong Jiang Chenchen Huang Pengyuan Dai Fenghua Liu Xiaopeng Qi Gaojie Xu Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China Key Laboratory of additive Manufacturing Materials of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of ScienceNingbo315201China

The paper discusses the mechanical and thermal performance manifested in natural nanorods attapulgite(ATP)reinforced Acrylonitrile butadiene styrene(ABS)nanocomposites in the process of fused deposition modeling(FDM).Molten extrusion technique was taken to manufacture the filaments of ABS/organic-attapulgite(OAT)nanocomposites with different mass fraction and the printing operation was made by one commercial FDM three-dimensional(3D)*** indicate that the mechanical performance of these FDM 3D printed specimens are improved obviously via the introduction of OAT,and tensile strength of the ABS/OAT nanocomposites parts with only 2 wt%OAT addition is enhanced by 48.1%.At the same time,the addition OAT can reduce the linear expansion coefficient and creep flexibility,and improve the thermal stability and dimensional accuracy of these FDM 3D printed parts.

关键词： ABS organic-attapulgite fused deposition modeling nanocomposites