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Customized heat treatment process enabled excellent mechanical properties in wire arc additively manufactured Mg-RE-Zn-Zr alloys

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International Journal of Extreme Manufacturing 2024年第4期6卷 276-289页

作者： Dong Ma Chunjie Xu shang sui Yuanshen Qi Can Guo Zhongming Zhang Jun Tian Fanhong Zeng Sergei Remennik Dan Shechtman School of Materials Science and Engineering Xi'an University of TechnologyXi'anShaanxi 710048People's Republic of China Xi'an Shechtman Nobel Prize New Materials Institute Xi'an 710048People's Republic of China Xi'an Key Laboratory of Advanced Magnesium Alloy Additive Manufacturing and Precision Forming Xi'anShaanxi 710048People's Republic of China Department of Materials Science and Engineering and Guangdong Provincial Key Laboratory of Materials and Technologies for Energy Conversion Guangdong Technion—Israel Institute of TechnologyShantou 515063People's Republic of China MGM Nobel Prize New Materials Co. LtdTongchuan 727100People's Republic of China Department of Materials Science and Engineering Technion-Israel Institute of TechnologyHaifa 32000Israel Center for Nanoscience&Nanotechnology Hebrew University of JerusalemEdmond J.Safra CampusJerusalem 91904Israel

Customized heat treatment is essential for enhancing the mechanical properties of additively manufactured metallic materials,especially for alloys with complex phase constituents and heterogenous ***,the interrelated evolutions of different microstructure features make it difficult to establish optimal heat treatment ***,we proposed a method for customized heat treatment process exploration and establishment to overcome this challenge for such kind of alloys,and a wire arc additively manufactured(WAAM)Mg-Gd-Y-Zn-Zr alloy with layered heterostructure was used for feasibility *** this method,the optimal microstructures(fine grain,controllable amount of long period stacking ordered(LPSO)structure and nano-scaleβ'precipitates)and the corresponding customized heat treatment processes(520°C/30 min+200°C/48 h)were obtained to achieve a good combination of a high strength of 364 MPa and a considerable elongation of 6.2%,which surpassed those of other state-of-the-art WAAM-processed Mg ***,we evidenced that the favorable effect of the undeformed LPSO structures on the mechanical properties was emphasized only when the nano-scaleβ'precipitates were *** is believed that the findings promote the application of magnesium alloy workpieces and help to establish customized heat treatment processes for additively manufactured materials.

关键词： wire arc additive manufacturing heat treatment Mg-RE-Zn-Zr alloys LPSO structure mechanical properties

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Microstructure and properties of LZQT600-3 HCCDIBs for plunger pump cylinder

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China Foundry 2024年第2期21卷 197-204页

作者： Chun-jie Xu Yuan-ying Jin Dong Ma Zhen Zhao Jia-wei Qi shang sui Xiang-quan Wu Can Guo Zhong-ming Zhang Yong-hui Liu Dan Shechtman School of Materials Science and Engineering Xi'an University of TechnologyXi'an 710048China Xi'an Shechtman Nobel Prize New Materials Institute Xi'an 710048China Tongchuan Huazhu Precision Technology Co. Ltd.Tongchuan 727100ShaanxiChina Faculty of Materials Science and Engineering Technion-Israel Insititue of TechnologyHaifa 3200003Israel

It is important to improve the comprehensive performance of the ductile iron bars(DIBs)for the cylinder block of the extra high pressure hydraulic plunger pump and accelerate the industrial *** this work,the LZQT600-3 DIBs with the diameter of 145 mm were prepared by the horizontal continuous casting(HCC)process,that is,LZQT600-3 *** microstructure and room temperature tensile properties of different sections[left-edge(surface layer),left-1/2R(left half of the radius),and the center of the HCCDIBs]were *** results show that the spheroidization of LZQT600-3 HCCDIBs matrix from the left-edge,left-1/2R to the center is at nodulizing grade II and *** the cooling rate gradually decreases from surface to the center of the HCCIBs,the number of spheroidized graphite is gradually reduced,the size is gradually increased,the shape factor is decreased,and the pearlite content and lamellate spacing are *** the horizontal direction of the section,the hardness of the material is distributed symmetrically around the center of the *** the vertical direction,the hardness distribution in the center of the HCCDIBs is asymmetrical due to the gravity during the solidification ***,the microstructure in the lower part of the section solidifies relatively *** left-edge has the best tensile mechanical properties,and the ultimate tensile strength,yield tensile strength and elongation are 597.3 MPa,418.5 MPa and 9.6%,*** tensile fracture belongs to the ductile-brittle hybrid *** comprehensive performances of LZQT600-3 HCCDIBs meet the actual application requirements of ultra-high pressure hydraulic plunger pump cylinder.

关键词： horizontal continuous casting(HCC) nodular cast iron ductile iron bars microstructure mechanical properties

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Microstructure and room-temperature tensile property of Ti-5.7Al-4.0Sn-3.5Zr-0.4Mo-0.4Si-0.4Nb-1.0Ta-0.05C with near equiaxed β grain fabricated by laser directed energy deposition technique

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Journal of Materials Science & Technology 2022年第6期101卷 308-320页

作者： MengCheng Deng shang sui Bo Yao Liang Ma Xin Lin Jing Chen State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi’an 710072China

Near-equiaxed β grain was achieved in the near-α Ti60(Ti-5.7Al-4.0Sn-3.5Zr-0.4Mo-0.4Si-0.4Nb-1.0Ta-0.05C) titanium alloy via laser directed energy deposition(LDED). The microstructural evolution along the building direction and the room-temperature tensile properties along the horizontal and vertical directions(building direction) were systematically studied through SEM and OM. EBSD and XRD were utilized to accurately demonstrate the texture of the α and β phases. The results showed that the α phase presented a low texture intensity, which was ascribed to the weak textured β grain with near-equiaxed morphology, since there are Burgers orientation relationships during the β →α transition. In addition, numerical simulation, combined with the CET curve of Ti60 alloy considering the effect of multi-composition,was utilized to elucidate the formation mechanism of the near-equiaxed β grains. Furthermore, according to the solidification theory, we proposed that the solidification temperature range ΔTfwas more accurate than the growth restriction factor Q in predicting the formation tendency of equiaxed β grain in different titanium alloys. Tensile results showed that the horizontal and vertical samples had similar strength,while the former exhibited larger elongation than the latter. The effect of the near-equiaxed β grain and the internal α phase on mechanical properties were revealed at last.

关键词： Laser directed energy deposition Near-αtitanium alloy Equiaxedβgrain Room-temperature tensile property

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Introduction of a New Method for Regulating Laves Phases in Inconel 718 Superalloy during a Laser-Repairing Process

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Engineering 2022年第9期16卷 239-246页

作者： shang sui Haosheng Li Zuo Li Xuan Zhao Liang Ma Jing Chen State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design Ministry of Industry and Information TechnologyNorthwestern Polytechnical UniversityXi’an 710072China

The morphology,size,and distribution of Laves phases have important influences on the mechanical properties of laser-repaired Inconel 718(IN718)*** to the deterioration of the substrate zone,the Laves phase in the laser cladding zone of IN718 superalloy cannot be optimized by a hightemperature solution *** this study,an in situ laser heat-treatment method was proposed to regulate the morphology and size of the Laves phase in the laser cladding zone of IN718 superalloy without impacting the substrate *** the in situ laser heat-treatment process,a laser was used to heat previously deposited layers with optimized manufacturing parameters.A thermocouple and an infrared camera were used to analyze thermal cycles and real-time temperature fields,*** and micro-segregations were observed by optical microscopy,scanning electron microscopy,and electron probe *** was found that the in situ laser heat treatment effectively changed the morphology and size of the Laves phase,which was transformed from a continuous striplike shape to a discrete granular *** effective temperature range and duration were the two main factors influencing the Laves phase during the in situ laser heat-treatment *** effective temperature range was determined by the laser linear energy density,and the peak temperature increased with the increase of the linear energy *** addition,the temperature amplitude could be reduced by simultaneously increasing the laser power and the scanning ***,a flow diagram was developed based on the in situ laser heat-treatment process,and the deposition of a single-walled sample with fine and granular Laves phases was detected.

关键词： Laser repair In situ laser heat treatment Inconel 718 alloy Laves phase

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Study on anisotropy of microstructure and mechanical properties of AZ31 magnesium alloy fabricated by wire arc additive manufacturing

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China Foundry 2023年第4期20卷 280-288页

作者： Dong Ma Chun-jie Xu Jun Tian shang sui Can Guo Xiang-quan Wu Zhong-ming Zhang School of Materials Science and Engineering Xi'an University of TechnologyXi'an 710048China Xi'an Shechtman Nobel Prize New Materials Institute Xi'an 710048China Xi'an Key Laboratory of Advanced Magnesium Alloy Additive Manufacturing and Precision Forming Xi'an 710048China MGM Nobel Prize New Materials Co. Ltd.Tongchuan 727100ShaanxiChina

Based on wire arc additive manufacturing(WAAM)technology,AZ31 magnesium alloy in bulk was successfully fabricated,and its microstructure as well as mechanical properties in different planes were observed and *** AZ31 magnesium alloy has a similar microstructure in the building direction(Z)and travel direction(X),both of which are equiaxed *** are heat-affected zones(HAZs)with coarse grains below the fusion *** second phase is primarily composed of the Mg17Al12 phase,which is evenly distributed in different *** addition,the residual stress varies in different *** is no significant difference in the hardness of the AZ31 alloy along the Z and X directions,with the average hardness being 68.4 HV and 67.9 HV,*** though the specimens’ultimate tensile strength along the travel direction is higher in comparison to that along the building direction,their differences in elongation and yield strength are smaller,indicating that the anisotropy of the mechanical properties of the material is small.

关键词： magnesium alloy wire arc additive manufacturing anisotropy microstructure mechanical properties

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Enhanced strength-ductility synergy in a wire and arc additively manufactured Mg alloy via tuning interlayer dwell time

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Journal of Magnesium and Alloys 2023年第12期11卷 4696-4709页

作者： Dong Ma Chunjie Xu shang sui Jun Tian Can Guo Xiangquan Wu Zhongming Zhang Dan Shechtman Sergei Remennik School of Materials Science and Engineering Xi’an University of TechnologyXi’anShaanxi 710048China Xi’an Shechtman Nobel Prize New Materials Institute Xi’an 710048China Xi’an Key Laboratory of Advanced Magnesium Alloy Additive Manufacturing and Precision Forming Xi’anShaanxi 710048China Department of Materials Science and Engineering Technion-Israel Institute of TechnologyHaifa 32000Israel Center for Nanoscience&Nanotechnology Hebrew University of JerusalemEdmond J.Safra CampusJerusalem 91904Israel MGM Nobel Prize New Materials Co. LtdTongchuan 727100China

Strength-ductility trade-off is a common issue in Mg alloys. This work proposed that a synergistic enhancement of strength and ductility could be achieved through tuning interlayer dwell time(IDT) in the wire and arc additive manufacturing(WAAM) process of Mg *** thermal couples were used to monitor the thermal history during the WAAM process. Additionally, the effect of different IDTs on the microstructure characteristics and resultant mechanical properties of WAAM-processed Mg alloy thin-wall were investigated. The results showed that the stable temperature of the thin-wall component could reach 290 ℃ at IDT=0s, indicating that the thermal accumulation effect was remarkable. Consequently, unimodal coarse grains with an average size of 39.6 μm were generated, and the resultant room-temperature tensile property was poor. With the IDT extended to 60s, the thermal input and thermal dissipation reached a balance, and the stable temperature was only 170 ℃, closing to the initial temperature of the substrate. A refined grain structure with bimodal size distribution was obtained. The remelting zone had fine grains with the size of 15.2 μm, while the arc zone owned coarse grains with the size of 24.5 μ*** alternatively distributed coarse and fine grains lead to the elimination of strength-ductility trade-off. The ultimate tensile strength and elongation of the samples at IDT=60s are increased by 20.6 and 75.0% of those samples at IDT=0s, respectively. The findings will facilitate the development of additive manufacturing processes for advanced Mg alloys.

关键词： Wire arc additive manufacturing Interlayer dwell time Strength-ductility Magnesium alloys

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Additive manufacturing of magnesium and its alloys: process-formabilitymicrostructure-performance relationship and underlying mechanism

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International Journal of Extreme Manufacturing 2023年第4期5卷 247-290页

作者： shang sui Shuai Guo Dong Ma Can Guo Xiangquan Wu Zhongming Zhang Chunjie Xu Dan Shechtman Sergei Remennik Daniel Safranchik Rimma Lapovok School of Materials Science and Engineering Xi’an University of TechnologyXi’anShaanxi 710048People’s Republic of China Xi’an Shechtman Nobel Prize New Materials Institute Xi’an 710048People’s Republic of China Xi’an Key Laboratory of Advanced Magnesium Alloy Additive Manufacturing and Precision Forming Xi’anShaanxi 710048People’s Republic of China School of Materials Science and Engineering Liaocheng UniversityLiaochengShandong 252059People’s Republic of China Department of Materials Science and Engineering Technion-Israel Institute of TechnologyHaifa 32000Israel Center for Nanoscience&Nanotechnology Hebrew University of JerusalemEdmond J.Safra CampusJerusalem 91904Israel Israel Institute of Metals Technion CityHaifa 3200003Israel Institute for Machine Elements Engineering Design and ManufacturingFreiberg 09599Germany Geelong Waurn Ponds Campus Deakin UniversityPigdons RoadGeelongVic 3216Australia

Magnesium and its alloys,as a promising class of materials,is popular in lightweight application and biomedical implants due to their low density and good *** manufacturing(AM)of Mg and its alloys is of growing interest in academia and *** domain-by-domain localized forming characteristics of AM leads to unique microstructures and performances of AM-process Mg and its alloys,which are different from those of traditionally manufactured ***,the intrinsic mechanisms still remain unclear and need to be in-depth ***,this work aims to discuss and analyze the possible underlying mechanisms regarding defect appearance and elimination,microstructure formation and evolution,and performance improvement,based on presenting a comprehensive and systematic review on the relationship between process parameters,forming quality,microstructure characteristics and resultant ***,some key perspectives requiring focus for further progression are highlighted to promote development of AM-processed Mg and its alloys and accelerate their industrialization.

关键词： additive manufacturing magnesium alloys underlying mechanisms forming quality microstructure characteristics and properties

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Study of the intrinsic mechanisms of nickel additive for grain refinement and strength enhancement of laser aided additively manufactured Ti–6Al–4V

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International Journal of Extreme Manufacturing 2022年第3期4卷 132-148页

作者： shang sui Youxiang Chew Fei Weng Chaolin Tan Zhenglin Du Guijun Bi Singapore Institute of Manufacturing Technology A∗STAR73 Nanyang Drive637662Singapore Institute of Intelligent Manufacturing GDASGuangzhou 510070People’s Republic of China

It is well-known that grain refiners can tailor the microstructure and enhance the mechanical properties of titanium alloys fabricated by additive manufacturing(AM). However, the intrinsic mechanisms of Ni addition on AM-built Ti–6Al–4V alloy is not well established. This limits its industrial applications. This work systematically investigated the influence of Ni additive on Ti–6Al–4V alloy fabricated by laser aided additive manufacturing(LAAM). The results showed that Ni addition yields three key effects on the microstructural evolution of LAAM-built Ti–6Al–4V alloy.(a) Ni additive remarkably refines the prior-β grains, which is due to the widened solidification range. As the Ni addition increased from 0 to 2.5 wt. %, the major-axis length and aspect ratio of the prior-β grains reduced from over 1500 μm and 7 to 97.7 μm and1.46, respectively.(b) Ni additive can discernibly induce the formation of globular α phase,which is attributed to the enhanced concentration gradient between the β and α phases. This is the driving force of globularization according to the termination mass transfer theory. The aspect ratio of the α laths decreased from 4.14 to 2.79 as the Ni addition increased from 0 to2.5 wt. %.(c) Ni as a well-known β-stabilizer and it can remarkably increase the volume fraction of β phase. Room-temperature tensile results demonstrated an increase in mechanical strength and an almost linearly decreasing elongation with increasing Ni addition. A modified mathematical model was used to quantitatively analyze the strengthening mechanism. It was evident from the results that the α lath phase and the solid solutes contribute the most to the overall yield strength of the LAAM-built Ti–6Al–4V–x Ni alloys in this work. Furthermore, the decrease in elongation with increasing Ni addition is due to the deterioration in deformability of the β phase caused by a large amount of solid-solution Ni atoms. These findings can accelerate the development of additively manufacture

关键词： Ni addition microstructure refinement laser aided additive manufacturing titanium alloys strengthening mechanism

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成形气氛对高沉积率激光熔覆GH4169高温合金显微组织的影响

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中国激光 2020年第8期47卷 64-72页

作者：赵轩隋尚李祚孙楚陈静西北工业大学凝固技术国家重点实验室陕西西安710072

激光熔覆过程伴随着成形气氛与熔池的接触,成形气氛是影响熔覆层显微组织的重要因素。为了实现大型复杂精密、高性能金属结构件的快速制备,高沉积率激光熔覆技术在传统激光熔覆技术的基础上大幅提高能量输入与质量输入,但这也会改变熔... 详细信息

激光熔覆过程伴随着成形气氛与熔池的接触,成形气氛是影响熔覆层显微组织的重要因素。为了实现大型复杂精密、高性能金属结构件的快速制备,高沉积率激光熔覆技术在传统激光熔覆技术的基础上大幅提高能量输入与质量输入,但这也会改变熔池的形貌与温度,从而改变气氛对熔池的作用;此外,随着成形件尺寸增大,提供保护气氛的成本也将急剧增大。基于此,本文采用高沉积率激光熔覆技术分别在氩气气氛与空气气氛下进行GH4169高温合金的单道熔覆实验,研究了成形气氛对高沉积率激光熔覆GH4169合金凝固条件、熔覆层几何特征以及显微组织的影响。结果表明:不同气氛的散热条件虽然改变了熔池的凝固条件,但其对氧化作用的影响很小;与氩气气氛相比,空气气氛下熔池的冷却速率更大,熔覆层一次枝晶间距更细小,Laves相更少,微观偏析程度更低。本文研究结果说明,相比于开放的空气气氛,氩气保护气氛对高沉积率激光熔覆GH4169合金凝固条件与显微组织没有明显的增益作用,这一结果可为工业生产提供参考。

关键词：激光技术高沉积率激光熔覆成形气氛 GH4169高温合金显微组织熔池

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棉花-花生轮作下的根系土壤细菌群落结构及功能分析

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中国油料作物学报 2024年第3期46卷 625-634页

作者：崔福洋侯献飞苗昊翠贾东海顾元国陈晓露李强施俊杰汪天玲高君胡凤仪宋贤明张云罗玉涛黄奕尚随腾张帆伊犁师范大学新疆伊犁835000 新疆农业科学院经济作物研究所新疆乌鲁木齐830091

为了提升棉花和花生产量,开展棉花-花生轮作模式研究,分析轮作模式下土壤根系微生物的群落结构与功能。以棉花连作、花生连作、棉花花生轮作、花生棉花轮作和休耕为研究对象,探明轮作后作物根际土壤微生物群落结构变化,利用16S rRNA基... 详细信息

为了提升棉花和花生产量,开展棉花-花生轮作模式研究,分析轮作模式下土壤根系微生物的群落结构与功能。以棉花连作、花生连作、棉花花生轮作、花生棉花轮作和休耕为研究对象,探明轮作后作物根际土壤微生物群落结构变化,利用16S rRNA基因高通量测序技术分析根系细菌群落结构与功能。结果发现:轮作提高了根系细菌群落的多样性;土壤样本中共获得5009952个有效序列,休耕模式下OTU(operational taxonomic units)含量最多。在轮作种植模式中变形菌门、酸杆菌门和放线菌门为优势菌门;其次轮作模式增加了厚壁菌门、拟杆菌门和芽单胞菌门的丰富度。根据功能不同,将菌群共划分为8类,轮作出现较多微生物基因遗传相关的功能类群,整体以代谢相关的类群居多,与人类和植物病原菌的功能蛋白组富集明显。由此得出,棉花,花生轮作能够提高微生物丰富度,增加多样性,改变土壤微生物群落结构,促进作物根系对营养物质的吸收,提高作物产量。

关键词：棉花-花生轮作细菌群落 PICRUSt功能预测

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