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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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Microstructure and properties of ductile iron bars for plunger pump prepared by horizontal continuous casting process

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China Foundry 2019年第2期16卷 118-125页

作者： Chun-jie Xu Zhen Zhao Yu Lei Yong-hui Liu Zhong-ming Zhang Yan Li dan shechtman School of Materials Science and Engineering Xi'an University of Technology Xi'an shechtman Nobel Prize New Materials Institute Shaanxi Huaan Continuous Casting Co. Ltd. Faculty of Materials Science and Engineering Technion-Israel Insititue of Technology

Ductile iron bars(DIBs) with a diameter of 145 mm, used for plunger pump production, were made by the horizontal continuous casting(HCC). The microstructure of the samples cut at three locations with different distances away from the surface(~20 mm from the surface, half of the radius and the center of the HCCDIBs)were investigated. The mechanical properties were measured by tensile and torsion tests. Results show that after the spheroidization of graphite, the iron matrix incorporates the nodules of Format I, Size 8 close to the surface, Format I, Size 7 at the half of the radius from the surface, and Format II, Size 6 in the centre of the bar,according to the ASTM A247 standard. The content of pearlite in the matrix changes from 55%(~20 mm from the surface) to 70%(half of the radius) and 80%(the center of the HCCDIBs). The strengths in tension are 552, 607 and 486 MPa with the elongations of 12.5%, 10.5% and 5.8% in samples cut at these three locations from the surface to the centre, respectively. The strength in torsion is equal to 558, 551 and 471 MPa at corresponding torsion angles of 418°, 384° and 144° respectively to the same distance from the bar surface. Fracture in tension is manifested via crack propagation through the interface between graphite nodules and matrix(Mode I), while in torsion the fracture is caused by the shear of graphite nodules(Mode II). It is shown that the transition between two fracture modes is also dependent on the size of graphite nodule. Typically, fracture Mode I was observed for nodules of smaller diameter(less than 22.7 μm) and fracture Mode II was seen for nodules of greater diameter(more than 24.8 μm).

关键词： horizontal continuous casting ductile iron bars plunger pump tension and torsion properties microstructure

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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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钆对Mg-8Li-4Zn-xGd合金铸态组织与力学性能的影响

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中国有色金属学报 2020年第4期30卷 793-800页

作者：徐春杰徐信锋马涛孟令楠张忠明 shechtman dan 西安理工大学材料科学与工程学院西安710048 西安谢赫特曼诺奖新材料研究院西安710048 陕西铁路工程职业技术学院机电工程系渭南714099 上海航天精密机械研究所上海201600

采用锂盐熔剂保护熔铸Mg-8Li-4Zn-xGd(x=1,3,5)合金铸锭,研究钆含量对铸态合金组织和力学性能的影响。结果表明:Mg-8Li-4Zn-xGd合金基体由α-Mg(HCP)和β-Li(BCC)双相构成。随着钆含量的增加,Mg5Gd共晶相和Zn12Gd化合物相逐渐连成网状,... 详细信息

采用锂盐熔剂保护熔铸Mg-8Li-4Zn-xGd(x=1,3,5)合金铸锭,研究钆含量对铸态合金组织和力学性能的影响。结果表明:Mg-8Li-4Zn-xGd合金基体由α-Mg(HCP)和β-Li(BCC)双相构成。随着钆含量的增加,Mg5Gd共晶相和Zn12Gd化合物相逐渐连成网状,将基体α+β双相隔离成20~40μm的等轴状或类似于铸铁中的共晶团状,可有效细化α-Mg相和连续的β-Li相;组织中大颗粒Mg2Zn11相弥散分布在β-Li相内,Mg51Zn20相分布在α-Mg晶界处;锌元素还可以在β-Li相中析出细小弥散分布的MgZn相,其数量随钆含量的增加而增加,可直接弥散强化β-Li相。此外,锌和钆对合金硬度的影响较大,随着钆含量的增加,合金的抗拉强度提高,但伸长率降低。

关键词： Mg-Li合金钆显微组织相组成力学性能

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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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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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选区激光熔化AZ91D镁合金的组织与性能

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铸造技术 2021年第9期42卷 749-753页

作者：徐春杰华心雨马东张凯军李珍娇程茜屠涛田军张忠明 dan shechtman 西安理工大学材料科学与工程学院陕西西安710048 西安谢赫特曼诺奖新材料研究院陕西西安710048 镁高镁诺奖(铜川)新材料有限公司陕西铜川727031

采用选区激光熔化技术制备了AZ91D镁合金,利用光学显微镜、扫描电镜和显微硬度计等研究了选区激光熔化AZ91D镁合金的组织与性能,并与传统铸造工艺进行了对比。结果表明,选区激光熔化制备的镁合金比常规铸造工艺所获得的晶粒更细小,显微... 详细信息

采用选区激光熔化技术制备了AZ91D镁合金,利用光学显微镜、扫描电镜和显微硬度计等研究了选区激光熔化AZ91D镁合金的组织与性能,并与传统铸造工艺进行了对比。结果表明,选区激光熔化制备的镁合金比常规铸造工艺所获得的晶粒更细小,显微硬度更高。同时,选区激光熔化工艺可以大幅提升AZ91D镁合金的抗拉强度与伸长率,性能指标远超传统铸件。

关键词：镁合金选区激光熔化增材制造微观组织力学性能

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轧制及热处理对7055铝合金组织与性能的影响

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特种铸造及有色合金 2023年第2期43卷 191-196页

作者：徐春杰杨怡马东郭灿武向权张忠明丹·谢赫特曼西安理工大学材料科学与工程学院西安市先进镁合金增材制造与精确成形重点实验室西安谢赫特曼诺奖新材料研究院

采用光学显微镜、X射线衍射仪、显微硬度计、材料试验机和电化学工作站等研究了轧制变形量和均匀化工艺对7055铝合金组织与力学性能和腐蚀性能的影响。结果表明,随着均匀化温度的升高,组织趋于均匀,第二相减少;最佳均匀化处理工艺为400... 详细信息

采用光学显微镜、X射线衍射仪、显微硬度计、材料试验机和电化学工作站等研究了轧制变形量和均匀化工艺对7055铝合金组织与力学性能和腐蚀性能的影响。结果表明,随着均匀化温度的升高,组织趋于均匀,第二相减少;最佳均匀化处理工艺为400℃×10 h+460℃×24 h,经均匀化处理后,合金组织主要由α-Al基体、MgZn_(2)和Al_(2)CuMg相组成,轧制处理并未改变合金相组成。同时,随着轧制变形量的增加,合金硬度先增大后减小,强度和耐腐蚀性能提高。变形量为40%时,合金硬度(HV5)达到峰值211.4;变形量为50%时,合金抗拉强度和屈服强度分别达到峰值618.6 MPa和610.3 MPa。

关键词：均匀化处理轧制变形量硬度强度耐蚀性

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