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Effects of Aging at 550℃ on α'-Martensitic Transformation of High Si-Bearing Metastable Austenitic Stainless Steel Weld metal

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Acta metallurgica Sinica(English Letters) 2024年第9期37卷 1467-1479页

作者： Yakui Chen Shitong Wei Dong Wu Shanping Lu Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

The high Si-bearing 15Cr-9Ni-Nb metastable austenitic stainless steel weld metal was prepared via gas tungsten arc welding and then processed by stabilized heat treatment(SHT)at 850℃ for 3 *** effects of 550℃ aging on the α'-martensitic transformation of the as-welded and the SHT weld metals were *** results showed that the weld metal had poor thermal stability of *** precipitation of NbC during the 850℃ SHT made the thermal stability of the local matrix decrease and led to the formation of a large amount of C-depleted α'-*** precipitation of coarse σ-phase at the δ-ferrite led to the Cr-depleted zone and the formation of Cr-depleted α'-martensite at the early stage of 550℃ *** homogenized diffusion of C and Cr in the matrix during 550℃ aging led to the restoration of austenitic thermal stability and the decrease of α'-martensite *** C-depleted α'-martensite content in the SHT weld metal decreased rapidly at the early stage of aging due to the fast diffusion rate of the C atom in the matrix,while the Cr-depleted α'-martensite decreased at the later stage of aging due to the decreased diffusion rate of the Cr.

关键词： Metastable austenitic stainless steel weld metal α'-martensitic transformation δ-ferrite σ-phase

Effect of Y and Ce Micro-alloying on Microstructure and Hot Tearing of As-Cast Al-Cu-Mg Alloy

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Acta metallurgica Sinica(English Letters) 2024年第6期37卷 939-952页

作者： Chunyu Yue Bowen Zheng Ming Su Yuxiang Wang Xiaojiao Zuo Yinxiao Wang Xiaoguang Yuan School of Materials Science and Engineering Shenyang University of TechnologyShenyang110870China institute of metal research Chinese Academy of SciencesShenyang110016China

In this work,the Al-Cu-Mg alloy with different Y(0-0.2 wt%)and Ce(0.5-1.5 wt%)are *** effect of mixed addition of Y and Ce on the grain structure and hot tearing for Al-4.4Cu-1.5Mg-0.15Zr alloy was investigated using"cross"hot tearing *** results indicate that as rare earth Y and Ce increases,the grain size becomes finer,the grain morphology changes from dendrite to equiaxed grain,and effectively reduce the hot tearing sensitivity coefficient(HTS1)and crack susceptibility coefficient(CSC)of the *** the increase of Ce element(0.5-1.5 wt%),the hot tearing susceptibility of the alloy decreases first and then *** the increase of Y element(0-0.2 wt%),the hot tearing sensitivity of the alloy *** the content of rare earth is 0.2 wt%Y+1.0 wt%Ce,the minimum HTS1 value and CSC value of the alloy are 68 and 0.53,*** earth Ce refines the alloy microstructure,shortens the feeding channel,and reduces the hot tearing ***,the rare earth Y can form Al6Cu6Y phase at the grain boundary,improve the feeding capacity of the ***,appropriate addition of rare earth Y and Ce can effectively reduce the hot tearing tendency of the alloy.

关键词： Al-Cu-Mg alloy Y and Ce Microstructure Thermal analysis Hot tearing sensitivity

Orientational growth behavior and mechanism of delta(δ)phase precipitation in cold-rolled Inconel 718 alloy during heat treatment

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Journal of Iron and Steel research International 2024年第1期31卷 264-274页

作者： Neng-yong Ye Guang-liang Zhang Tian-yue Huang Ming Cheng Shi-hong Zhang Lei Wang School of Materials Science&Engineering Taizhou UniversityTaizhou318000ZhejiangChina institute of metal research Chinese Academy of SciencesShenyang110016LiaoningChina

Due to the important role ofδphase's quantity and morphology in the mechanical and fatigue properties of Inconel 718 alloy and its components,it is necessary to renew insights into the effect of cold deformation on theδphase precipitation,especially on the morphology ***,the nucleation and growth behavior ofδphase in cold-rolled Inconel 718 alloy during aging were *** results show that the precipitation rate and volume fraction ofδphase increase with increasing the cold rolling reduction from 10%to 50%.The volume fraction ofδphase reaches equilibrium after 5 h,remaining at 5.98%,6.52%,and 6.79%under different rolling reductions(10%,30%,and 50%),*** nucleation ofδphase mainly occurs on different sites(grain boundaries,new twin boundaries and old twin boundaries)under 10%rolling reduction,whileδphase mainly nucleates on the new grain boundaries of static recrystallization due to 50%rolling *** the growth ofδphase undergoes a process of alternate orientation growth from spherical(nucleation)→short rod(longitudinal orientation growth)→short rod(radial orientation growth)→dynamic *** 10%rolling reduction,δphase tends to grow into the matrix,while under 50%rolling reduction,the orientation grows faster and is easily affected by the grain boundary curvature.

关键词： Inconel 718 alloy Cold rolling δphase Orientation growth Morphology evolution

An efficient CuZr-based metallic glasses electrode material for electrocatalytic degradation of azo dyes

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Journal of Environmental Sciences 2024年第2期136卷 537-546页

作者： Zhiwang Deng Bowen Zhao Songtao Li Zhengkun Li Shiming Zhang Kewei Zhang Zhengwang Zhu Taiyuan University of Science and Technology School of materials science and engineeringTaiyuan 030024China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China chinese academy of Sciences Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Qingdao Yunlu Advanced Materials Technology Co. Ltd.Qingdao 266232China

metallic glasses have received a lot of attention on wastewater treatment due to their unique atomic structure,and the use of metallic glasses as electrodes has produced unexpected electrocatalytic degradation effects for many pollutants through combining with electrochemical ***,it still is a formidable challenge to find a metallic glass electrode material with both efficient and clean for the catalytic degradation of *** this work,the Cu_(55)Zr_(45)metallic glassy ribbons are used as an electrode to degrade azo dyes and show the excellent degradation effect,which can reach 95.6%within 40 *** the degradation process,almost no additives are produced and Cu_(55)Zr_(45)metallic glassy ribbons have excellent effects under different pH ***,it exhibits good stability for degradation efficiency during the 8 cycle degradation tests of the amorphous alloy *** the copper nanoparticles are exposed on the surface of the ribbons,the oxidized copper obtained synergistically produce activated radicals is the primary degradation mechanism,where the auxiliary degradation mechanisms include electron transfer and the promotion of active *** research develops a new type of electrode material for wastewater treatment,and the economy and high efficiency of Cu55Zr45metallic glass endow it the expandable functional applications.

关键词： metallic glasses Azo dyes Electrocatalytic Degradation Oxidized copper

Improving millimeter-wave imaging quality using the vortex phase method

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DEFENCE TECHNOLOGY 2024年第9期39卷 193-202页

作者： Hu, Nairui Qi, Feng Wang, Yelong Liu, Zhaoyang Liu, Pengxiang Li, Weifan Key Lab Terahertz Imaging & Sensing Shenyang 110169 Peoples R China Shenyang Aerosp Univ Shenyang 110136 Peoples R China chinese acad Sci Key Lab Optoelect Informat Proc Shenyang 110169 Peoples R China chinese acad Sci Shenyang Inst Automat Shenyang 110169 Peoples R China chinese acad Sci Inst Robot & Intelligent Mfg Shenyang 110169 Peoples R China Univ chinese acad Sci Beijing 100049 Peoples R China

This paper investigates a new vortex wave imaging approach to improve the imaging quality of small metal targets of size less than 1.5 mm. Antennas with different spiral phase plates are designed to efficiently transmit vortex beams with orbital angular momentums (OAMs). By analyzing the OAM spectrum of the target, it was discovered that the predominant reflection contains a particular OAM mode that carries abundant azimuthal information. This can be explained by the OAM selectivity of the target and the guidance of the vortex transmitting beam. A simple reflection vortex imaging system was designed to capture the phase information. Measurement results show that the high image contrast reaches 14.9%, which is twice as high as that of the imaging without OAM. Both of simulations and experiments demonstrate that the vortex phase imaging approach proposed in this paper can effectively improve the imaging quality at 80 GHz. This approach is suitable for other millimeter wave imaging systems and is helpful to improve the resolution in anti-terrorism security checks.

关键词： Orbital angular momentums (OAMs) beams Focal plane imaging Spiral phase plates (SPPs) Vortex spectrum ORBITAL ANGULAR-MOMENTUM

4 x 112 Gb/s hybrid integrated silicon receiver based on photonic-electronic co-design

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chinese OPTICS LETTERS 2024年第8期22卷 082501-082501页

作者： Jin, Ye Xie, Yujun Zhang, Zhihan Lu, Donglai Yang, Menghan Li, Ang Meng, Xiangyan Qu, Yang Li, Leliang Shi, Nuannuan Li, Wei Zhu, Ninghua Qi, Nan Li, Ming chinese acad Sci Inst Semicond Key Lab Optoelect Mat & Devices Beijing 100083 Peoples R China Univ chinese acad Sci Ctr Mat Sci & Optoelect Engn Beijing 100190 Peoples R China Univ chinese acad Sci Sch Elect Elect & Commun Engn Beijing 100049 Peoples R China chinese acad Sci Inst Semicond Beijing 100083 Peoples R China Peng Cheng Lab Shenzhen 518055 Peoples R China

A 4 x 112 Gb/s hybrid-integrated optical receiver is demonstrated based on the silicon-photonic vertical p-i-n photodetector and silicon-germanium transimpedance amplifier. We propose a photonic-electronic co-design technique to optimize both the device-level and system-level performance, based on the end-to-end equivalent circuit model of the receiver. Continuous-time linear equalization and shunt peaking are employed to enhance the frequency response. Experimental results reveal that the optical-to-electrical 3-dB bandwidth of the receiver is 48 GHz. Clear open NRZ eye diagrams at 56 Gb/s and PAM-4 eye diagrams at 112 Gb/s are achieved without an equalizer in the oscilloscope. The measured bit error rates for 56 Gb/s in NRZ and 112 Gb/s in PAM-4 reach 1 x 10 -12 and 2.4 x 10-4 -4 (KP4-FEC: forward error correction) thresholds under -4 dBm input power, respectively. Furthermore, the proposed receiver boasts a power consumption of approximately 2.2 pJ/bit, indicating an energy efficient solution for data center traffic growth.

关键词： optical receiver silicon photonics hybrid integration co-design OPTICAL RECEIVER PAM-4

Effect of heat treatment on the microstructure,mechanical properties and fracture behaviors of ultra-high-strength SiC/Al-Zn-Mg-Cu composites

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International Journal of Minerals,metallurgy and Materials 2024年第10期31卷 2233-2243页

作者： Guonan Ma Shize Zhu Dong Wang Peng Xue BolüXiao Zongyi Ma Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Centre of Excellence for Advanced Materials Dongguan 523808China

A high-zinc composite,12vol%SiC/Al-13.3 Zn-3.27 Mg-1.07Cu(wt%),with an ultra-high-strength of 781 MPa was success-fully fabricated through a powder metallurgy method,followed by an extrusion *** effects of solid-solution and aging heat treat-ments on the microstructure and mechanical properties of the composite were extensively *** with a single-stage sol-id-solution treatment,a two-stage solid-solution treatment(470℃/1 h+480℃/1 h)exhibited a more effective solid-solution strengthen-ing owing to the higher degree of solid-solution and a more uniform *** to the aging hardness curves of the com-posite,the optimized aging parameter(100℃/22 h)was *** the aging temperature and time resulted in finer and more uniform nanoscale precipitates but only yielded a marginal increase in tensile *** fractography analysis revealed that intergranu-lar cracking and interface debonding were the main fracture mechanisms in the ultra-high-strength SiC/Al-Zn-Mg-Cu *** regions,such as the SiC/Al interface containing numerous compounds and the precipitate-free zones at the high-angle grain boundaries,were identified as significant factors limiting the strength enhancement of the *** compounds,including MgO,MgZn2,and Cu5Zn8,reduced the interfacial bonding strength,leading to interfacial debonding.

关键词： metal matrix composites heat treatment interfacial reaction mechanical properties fracture mechanism

Slicing of large-size single crystals by ultrafast laser with external stress assistance

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chinese OPTICS LETTERS 2024年第8期22卷 081601-081601页

作者： Wang, Lifeng Liu, Lili Wang, Yinan Li, Xun Li, Chenchen Li, Ming chinese acad Sci Xian Inst Opt & Precis Mech State Key Lab Transient Opt & Photon Xian 710119 Peoples R China Univ chinese acad Sci Beijing 100049 Peoples R China

The existing single-crystal slicing techniques result in significant material wastage and elevate the production cost of premium-quality thin slices of crystals. Here we report (for the first time, to our knowledge) an approach for vertical slicing of large-size single-crystal gain materials by ultrafast laser. By employing aberration correction techniques, the optimization of the optical field distribution within the high-refractive-index crystal enables the achievement of a continuous laser-modified layer with a thickness of less than 10 mu m, oriented perpendicular to the direction of the laser direction. The compressed focal spot facilitates crack initiation, enabling propagation under external forces, ultimately achieving the successful slicing of a Phi 12 mm crystal. The surface roughness of the sliced Yb:YAG is less than 2.5 mu m. The results illustrate the potential of low-loss slicing strategy for single-crystal fabrication and pave the way for the future development of thin disk lasers.

关键词： single-crystal gain materials ultrafast laser slicing YAG aberration correction FEMTOSECOND LASER DEFORMATION MECHANISM YAG

Steady-state multiscale CFD simulation of a circulating fl uidized bed riser

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PARTICUOLOGY 2024年第10期93卷 54-64页

作者： Ke, Zhaojie Tian, Yujie Li, Fei Lu, Bona Wang, Wei chinese acad Sci Inst Proc Engn State Key Lab Mesosci & Engn Beijing 100190 Peoples R China Univ chinese acad Sci Sch Chem Engn Beijing 100049 Peoples R China

Compared to transient simulation, steady-state simulation of circulating fluidized bed risers is more efficient, but is also harder to perform due to the complex scale-dependency of dense gas-solid flows. In this work, steady-state computational fluid dynamics (CFD) simulation of a riser is performed using the steady energy-minimization multi-scale (EMMS) drag. It is found that the steady state corresponds to an extremely large scale of length and time, thus the grid size required in steady-state simulation is larger than that in transient one. The time-averaged two-fluid model (TFM) coupled with the steady-state EMMS/1M drag model enables a good prediction of the S-shaped, axial solids distribution and the choking transition, whereas the two-phase turbulence and solids stress models are important in predicting the radially core-annular distribution of solids. So far as we know, this is the first time that one can predict the choking transition in a steady-state CFD simulation. Further improvement may need an EMMS modeling of the time-averaged solid stresses. (c) 2024 chinese Society of Particuology and institute of Process Engineering, chinese academy of Sciences. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

关键词： Fluidization Drag force Steady state Simulation Mesoscale GAS-PARTICLE FLOW STRUCTURE-DEPENDENT ANALYSIS FILTERED 2-FLUID MODELS FLUIDIZED-BED NUMERICAL-SIMULATION SOLID FLOWS EULERIAN SIMULATION VERTICAL PIPE EMMS VALIDATION