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Development of MoS_(2)-stainless steel catalyst by 3D printing for efficient destruction of organics via peroxymonosulfate activation

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Journal of Environmental Sciences 2024年第1期135卷 108-117页

作者： Yufeng Liu Jianhui Xu Xin Fu Pengxu Wang Dan Li Yunfei Zhang Shenggui Chen Chunhui Zhang Peng Liu School of Environment and Civil Engineering Dongguan University of TechnologyDongguan 523808China School of Art and Design Guangzhou Panyu PolytechnicGuangzhou 511483China Dongguan Institute of Science and Technology Innovation Dongguan University of TechnologyDongguan 523808China School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China

Herein,a novel MoS_(2)-stainless steel composite material was first synthetized via a 3D printing method(3DP MoS_(2)-SS)for peroxymonosulfate(PMS)activation and organics *** with MoS_(2)-SS powder/PMS system(0.37 g/(m^(2)/min)),4.3-fold higher k_(FLO)/S_(BET)value was obtained in 3DP MoS_(2)-SS/PMS system(1.60 g/(m^(2)/min),resulting from the superior utilization of active *** observed that 3DP MoS_(2)-SS significantly outperformed the 3DP SS due to the enhanced electron transfer rate and increased active ***,Mo^(4+)facilitated the Fe^(2+)/Fe^(3+)cycle,resulting in the rapid degradation of florfenicol(FLO).Quenching experiments and electron paramagnetic resonance spectra indicated that·OH,SO_(4)·^(-),O_(2)·^(-)and^(1)O_(2)were involved in the degradation of *** effect of influencing factors on the degradation of FLO were evaluated,and the optimized degradation efficiency of 98.69%was achieved at 1 mM PMS and pH of *** degradation products were detected by UPLC/MS analyses and several possible degradation pathways were proposed to be the cleavage of C-N bonds,dechlorination,hydrolysis,defluorination and *** addition,3DP MoS_(2)-SS/PMS system also demonstrated superior degradation performance for 2-chlorophenol,acetaminophen,ibuprofen and *** study provided deep insights into the MoS_(2)-SS catalyst prepared by 3DP technology for PMS activation and FLO-polluted water treatment.

关键词： 3D printing stainless steel MoS_(2) Peroxymonosulfate activation Degradation mechanism

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Microstructure evolution and performance improvement of powder metallurgy stainless steel with P addition

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Journal of Iron and steel Research(International) 2023年第10期30卷 2055-2066页

作者： Qian Qin Dao-qing Zhang Fang Yang Cun-guang Chen Jun-jie Hao Zhi-meng Guo Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Shunde Innovation School University of Science and Technology BeijingGuangzhou 528399GuangdongChina

P-containing 316L stainless steel was prepared by powder metallurgy technology using gas atomized alloy powder and phosphorus-iron alloy powder as raw materials.P addition was beneficial to sintering *** 0.6 wt.%P addition,the density increased from 7.60 to 7.82 g/cm^(3).In such case,the samples with 0.6 wt.%P addition should be sintered at a lower temperature of 1200℃.Otherwise,there were coarse grain boundary precipitates,which would seriously deteriorate the performance of stainless *** the case of suppressing the formation of coarse precipitates,appropriate P content had a beneficial effect on apparent morphology,hardness and strength of stainless *** 316L-0.6 wt.%P sample was sintered at 1200℃,the hardness and tensile strength were increased to 86.3 HRB and 672.8 MPa,respectively,and the elongation still reached 38.1%.Besides,it also had good corrosion resistance.

关键词： Phosphorus stainless steel Powder metallurgy Precipitate phase Performance

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Effects of cutting parameter on microstructure and corrosion behavior of 304 stainless steel in simulated primary water

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Journal of Materials Science & Technology 2022年第27期122卷 219-230页

作者： Honglin Yan Jianqiu Wang Zhiming Zhang Bright O.Okonkwo Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China

The influence of surface conditions on the corrosion behavior of engineering structures has been paid more ***,there is still a lack of systematic research on the effect of cutting parameters on material’s microstructure and performance in *** this paper,the effect of cutting parameters on microstructure and corrosion behaviors of 304 stainless steel in simulated primary water is well *** results show that different cutting parameters can cause the superficial layer a gradient microstructure with nanocrystalized layer on top and deformation band structures *** the similar surface roughness,the deformation microstructure can be very different due to the different cutting *** effect degree on the depth of deformation zone is feed rate>cutting depth>cutting *** larger feed rate,lower cutting depth,lower cutting rate may induce a deeper deformation *** the increasing depth away from the machined surface,the localized corrosion rate is decreased,and at the same depth the localized corrosion rate along the deformation bands is higher than that along the grain boundaries(GBs).The nanocrystalized surface has a smallest general corrosion rate due to the quick formation of Cr rich oxide ***,once the corrosion penetrates through this nanocrystalized layer,subsequent preferential corrosion at deformation bands and GBs will dominate and may lead to the significant increase of corrosion rate of the component in high temperature pressurized water.

关键词： stainless steel Transmission electron microscopy(TEM) High temperature corrosion Cutting parameter

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Design of a submerged entry nozzle for optimizing continuous casting of stainless steel slab

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Journal of Iron and steel Research(International) 2023年第11期30卷 2229-2241页

作者： Jia-chen Pang Guo-yu Qian Sheng Pang Wen-hui Ma Guo-guang Cheng School of Metallurgy and Energy Engineering Kunming University of Science and TechnologyKunming650093YunnanChina CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing100190China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China

To solve slag entrapment and casting slab defects in the process of stainless steel continuous casting,submerged entry nozzle(SEN)for slab casters operating at casting speed of 1 m/min was developed based on 3D numerical simulation and water modeling experiments by controlling the outlet shape and angle of original SEN with oval and 15°angle outlet under current industrial *** simulations of fluid velocity at outlets with different shapes and angles of SENs have been carried *** results showed that oval outlet with 5°and 15°angle led to asymmetric rotating flow pattern at outlet,as well as square outlet with 15°angle,but symmetric flow pattern formed at square outlet with 5°*** effect of these SENs on meniscus stability,flow field and slag entrapment behavior of stainless steel slab casting mold was further studied by water modeling *** results showed that difficult floating fine droplets formed when the angle of outlet was 15°under the dual effect of vortex convection and shear force due to the strong swirling flow from outlet and rotating flow of ***,outlet with 5°angle could lead to the formation of larger slag droplets,while the oval outlet with 5°angle could result in the scour to the mold ***,the square outlet with 5°angle was a relatively ideal solution for the submerged entry nozzle from the aspects of the stability of the mold and the slag entrapment *** the design of a new SEN according to the experimental result,the solidification structure of continuous casting slab was obviously improved by industrial test.

关键词： stainless steel Continuous casting Submerged entry nozzle Water modeling Slag entrapment

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Thermal fatigue behavior of 441 ferritic stainless steel in air and synthetic automotive exhaust gas

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Science China(Technological Sciences) 2022年第1期65卷 169-178页

作者： ZHAN JianMing BI HongYun LI MouCheng Materials Genome Institute Shanghai UniversityShanghai 200072China Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 200431China Institute of Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200072China

The thermal fatigue behavior of 441 ferritic stainless steel was investigated in air and synthetic automotive exhaust gas by the cyclic tests under 100℃-800℃ and 900℃ *** the fracture failure,the microstructure,oxide film,and precipitated phases were analyzed using optical microscopy,X-ray diffraction,scanning electron microscopy,and transmission electron *** both atmospheres,increasing the maximum temperature from 800℃ to 900℃ results in lower strength and fatigue life and higher elongation and grain *** the same maximum temperature,the thermal fatigue life of the specimen is lower in the synthetic exhaust gas than in the *** the higher maximum temperature and the synthetic exhaust gas facilitate fatigue *** failure mechanism is discussed according to the grain size,thermal stress,high-temperature oxidation rate,and the precipitation of secondary *** precipitated carbides play an important role in the rapid fatigue failure of specimens in the synthetic exhaust gas.

关键词： stainless steel automobile exhaust gas thermal fatigue oxidation precipitation

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Oral microbiota accelerates corrosion of 316L stainless steel for orthodontic applications

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Journal of Materials Science & Technology 2022年第33期128卷 118-132页

作者： Qingfu Wang Mingxing Zhang Chuntian Yang Yi Yang Enze Zhou Pan Liu Daiqiang Jin Dake Xu Lin Wu Fuhui Wang School and Hospital of Stomatology China Medical UniversityLiaoning Provincial Key Laboratory of Oral DiseasesShenyang 110001China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Electrobiomaterials Institute Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyang 110819China Department of Oral Implantology Tianjin Stomatological HospitalSchool of MedicineNankai University&Tianjin Key Laboratory of Oral and Maxillofacial Function ReconstructionTianjin 300041China

In this work,microbiologically influenced corrosion(MIC)of 316 L stainless steel(SS)caused by oral microbiota was investigated with HOMINGS 16 S rRNA gene sequencing technology,and electrochemical and surface analysis *** results showed that oral microbiota from different subjects developed multi-species biofilms with significant differences in structure and composition of bacteria strains on the316 L SS *** the presence of oral microbiota,more severe pitting corrosion and faster dissolution of metallic ions including Ni and Cr were *** biofilm considerably decreased the pitting potential of 316 L SS from 1268.0±29.1 mV ***(abiotic control)to less than 500 mV *** corrosion current density in the presence of oral microbiota from subject 1(115.3±83.3 nA cm^(-2))and subject 2(184.4±162.0 nA cm^(-2))was at least 4 times more than that in the abiotic medium(28.0±2.3 nA cm^(-2)).The electroactive microorganisms with the potential to facilitate corrosion via extracellular electron transfer found in oral microbiota may be mainly responsible for the accelerated corrosion.

关键词： Oral microbiota Microbiologically influenced corrosion stainless steel Electroactive microorganism

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Journal of Materials Science & Technology 2023年第32期163卷 158-167页

作者： Jijun Xin Wei Wang Xiao Yang Mebrouka Boubeche Shanlin Wang Hengcheng Zhang Chuanjun Huang Yong Li Bingkun Lyu Fuzhi Shen Wentao Sun Laifeng Li Songshan Lake Materials Laboratory Dongguan 523808China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Nanchang Hangkong University Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace ComponentsNanchang 330036China

The microstructure and mechanical properties of dissimilar laser beam welded joint between CrMnFeCoNi alloy and 316LN stainless steel was *** results showed that the defect-free dissimilar joint was obtained by laser beam *** ultimate strength of the welded joints can reach∼90%of the base materials at both room and cryogenic *** deformation substructure mainly consisted of planar dislocation,the stacking faults and the dissociation of stacking faults into *** volume fraction of the nanotwins was increasing at cryogenic *** hardness fluctuates greatly in welded joint and the lowest hardness was located at fusion zone near the fusion *** fracture of the welded joint was located at the fusion zone in consistence with the lowest hardness *** is mainly attributed to the coarse grain and stress concentration at this area.

关键词： High entropy alloy stainless steel Cryogenic temperature Microstructure evolution Mechanical properties

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Effect of surface damage induced by cavitation erosion on pitting and passive behaviors of 304L stainless steel

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International Journal of Minerals,Metallurgy and Materials 2023年第7期30卷 1338-1352页

作者： Liang Li Yanxin Qiao Lianmin Zhang Aili Ma Enobong Felix Daniel Rongyao Ma Jian Chen Yugui Zheng School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shenyang National Research Center for Materials Science Institute of MetalsChinese Academy of SciencesShenyang 110016China

The corrosion behavior of 304L stainless steel(SS)in 3.5wt%NaCl solution after different cavitation erosion(CE)times was mainly evaluated using electrochemical noise and potentiostatic polarization *** was found that the antagonism effect resulting in the passivation and depassivation of 304L SS had significant distinctions at different CE *** passive behavior was predominant during the incubation period of CE where the metastable pitting initiated at the surface of 304L *** the rising period of CE,the 304L SS experienced a transition from passivation to depassivation,leading to the massive growth of metastable pitting and stable *** depassivation of304L SS was found to be dominant at the stable period of CE where serious localized corrosion occurred.

关键词： cavitation erosion pitting stainless steel electrochemical noise

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Experimental study and cellular automata simulation of corrosion behavior of ferritic stainless steel in molten aluminum

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Journal of Iron and steel Research(International) 2022年第9期29卷 1485-1494页

作者： Ji-yin Long Tian-tian Zhao Mei-yi Yuan Yi-tao Yang School of Materials Science and Engineering Shanghai UniversityShanghai 200444China

The corrosion behavior of feritic stainless steel(446)after being immersed in molten Al alloy at 750℃ for 1,2,4,and 8 h has been investigated experimentally and *** microstructure and composition distribution at the corrosion interface were characterized using the optical microscope,scanning electron microscope,and energy dispersive *** results showed that Cr and Si synergistically delay the progress of corrosion at the interface of the intermetallic compounds(IMC).In the early stage of corrosion,Si element was enriched at the interface of IMC1 and IMC2,and the diffusion channels of Al element were occupied by ***,as the corrosion progresses,Cr and Si gradually gather to form a band-like structure and coarsen,causing their hindering effect to be *** the corrosion time increases,the banded structure was further aggregated and coarsened,and the inhibitory effect of Cr and Si elements on corrosion was strongly *** addition,based on the cellular automata dynamics model of reaction-diffusion,the corrosion process of ferritic stainless steel in aluminum alloy melts was *** is demonstrated that if there is no stabilizing effect of Cr element,the thickness of IMC will be doubled.

关键词： stainless steel Molten Al alloy Intermetallic Diffusion-Cellular automata

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Tribological behavior of polydopamine/polytetrafluoroethylene coating on laser textured stainless steel with Hilbert curves

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Friction 2023年第7期11卷 1307-1319页

作者： Firuze SOLTANI-KORDSHULI Nathaniel HARRIS Min ZOU Department of Mechanical Engineering University of ArkansasFayetteville AR 72701USA Center for Advanced Surface Engineering University of ArkansasFayetteville AR 72701USA

Shallow Hilbert curve patterns with easily programmable texture density were selected for laser texturing of stainless steel *** different texture path segment lengths(12 and 24 μm)and four different laser power percentages(5%,10%,15%,and 20%)were *** textured and smooth substrates were coated with thin polydopamine/polytetrafluoroethylene(PDA/PTFE)coatings for tribological property *** effects of texture density(texture area coverage)and laser power on the durability and friction of the coated surfaces were *** texturing the substrates improved the coating durability up to 25 times,reduced the friction coefficient,and prevented coating global *** textures fabricated with a laser power of 15%and a texture path segment length of 12 μm yielded the best coating *** textures provided the interlocking for the PTFE coating and thus prevented its global ***,the PTFE inside the texture grooves replenished the solid lubricant worn away in the wear track and prolonged the coating wear life.

关键词： polytetrafluoroethylene(PTFE) coating durability laser texturing Hilbert curve stainless steel

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