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Effects of mechanical vibration on filling and solidification behavior, microstructure and performance of Al/Mg bimetal by lost foam compound casting

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China Foundry 2023年第6期20卷 469-479页

作者： Guang-yu Li Feng Guan Wen-ming Jiang Yuan-cai Xu Zheng Zhang zi-tian fan State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Al/Mg bimetal was prepared by lost foam solid-liquid compound casting,and the effects of mechanical vibration on the filling and solidification behavior,microstructure and performance of the bimetal were *** show that the mechanical vibration has a remarkable influence on the filling and solidification *** is found that after mechanical vibration,the filling rate increases and the filling rate at different times is more uniform than that without *** addition,the mechanical vibration also increases the wettability between liquid AZ91D and A356 *** mechanical vibration reduces the horizontal and vertical temperature gradient of the casting and makes the temperature distribution of the whole casting more *** to the Al/Mg bimetal without vibration,the shear strength is improved by 39.76%after the mechanical vibration is applied,due to the decrease of the inclusions and Al_(12)Mg_(17) dendrites,and the refinement and uniform distribution of the Mg_(2)Si particles in the interface of the Al/Mg bimetal.

关键词： lost foam casting filling and solidification processes Al/Mg bimetal mechanical vibration microstructure mechanical properties

Effect of scanning speed during PTA remelting treatment on the microstructure and wear resistance of nodular cast iron

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International Journal of Minerals,Metallurgy and Materials 2014年第4期21卷 363-370页

作者： Hua-tang Cao Xuan-pu Dong Qi-wen Huang Zhang Pan Jian-jun Li zi-tian fan State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology

The surface of nodular cast iron （NCI） with a ferrite substrate was rapidly remelted and solidified by plasma transferred arc （PTA） to induce a chilled structure with high hardness and favorable wear resistance. The effect of scanning speed on the microstructure, micro-hardness distribution, and wear properties of PTA-remelted specimens was systematically investigated. Microstructural characterization in-dicated that the PTA remelting treatment could dissolve most graphite nodules and that the crystallized primary austenite dendrites were transformed into cementite, martensite, an interdendritic network of ledeburite eutectic, and certain residual austenite during rapid solidifica-tion. The dimensions of the remelted zone and its dendrites increase with decreased scanning speed. The microhardness of the remelted zone varied in the range of 650 HV0.2 to 820 HV0.2, which is approximately 2.3-3.1 times higher than the hardness of the substrate. The wear re-sistance of NCI was also significantly improved after the PTA remelting treatment.

关键词： nodular cast iron surface treatment plasma arc remelting scanning speed microhardness wear resistance

Combined effects of ultrasonic vibration and FeCoNiCrCu coating on interfacial microstructure and mechanical properties of Al/Mg bimetal by compound casting

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China Foundry 2024年第5期21卷 588-598页

作者： Yuan-cai Xu Wen-ming Jiang Qing-qing Li Ling-hui Yu Xiao-peng Yu zi-tian fan State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

In this work,a new treatment method combining ultrasonic vibration with FeCoNiCrCu high entropy alloy(HEA)coating was used to prepared Al/Mg bimetal through the lost foam compound *** effects of composite treatment involving ultrasonic vibration and HEA coating on interfacial microstructure and mechanical properties of Al/Mg bimetal were *** demonstrate that the interface thickness of the Al/Mg bimetal with composite treatment significantly decreases to only 26.99%of the thickness observed in the untreated Al/Mg *** HEA coating hinders the diffusion between Al and Mg,resulting the significant reduction in Al/Mg intermetallic compounds in the *** Al/Mg bimetal interface with composite treatment is composed of Al_(3)Mg_(2)and Mg_(2)Si/AlxFeCoNiCrCu+FeCoNiCrCu/δ-Mg+Al_(12)Mg_(17)eutectic *** interface resulting from the composite treatment has a lower hardness than that without *** acoustic cavitation and acoustic streaming effects generated by ultrasonic vibration promote the diffusion of Al elements within the HEA coating,resulting in a significant improvement in the metallurgical bonding quality on the Mg *** fracture position shifts from the Mg side of the Al/Mg bimetal only with HEA coating to the Al side with composite *** shear strength of the Al/Mg bimetal increases from 32.16 MPa without treatment to 63.44 MPa with ultrasonic vibration and HEA coating,increasing by 97.26%.

关键词： ultrasonic vibration FeCoNiCrCu HEA coating Al/Mg bimetal interfacial microstructure shear strength compound casting

Microstructure and mechanical properties of a cast heat-resistant rare-earth magnesium alloy

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China Foundry 2023年第4期20卷 289-298页

作者： Xiao-ping Zhu Jun-qing Yao Hai-long Wu Xin-wang Liu Hua Liu zi-tian fan Shu-lin Lü Kai Wang zi-dong Wang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Dekai Intelligent Casting Co. Ltd.Zhuozhou 072750HebeiChina China Iron and Steel Research Institute Group Beijing 100081China Guangdong Hongtu Wuhan Die-casting Co. Ltd.Wuhan 430207China

Microstructure,mechanical properties and phase transformation of a heat-resistant rare-earth(RE)Mg-16.1Gd-3.5Nd-0.38Zn-0.26Zr-0.15Y(wt.%)alloy were *** as-cast alloy is composed of equiaxedα-Mg matrix,net-shaped Mg5RE and Zr-rich *** to aging hardening curves and tensile properties variation,the optimized condition of solution treatment at 520℃for 8 h and subsequent aging at 204℃for 12 h was *** continuous secondary Mg5RE phase predominantly formed at grain boundaries during solidification transforms to residual discontinuousβ-Mg5RE phase and fine cuboid REH2particles after heat *** annealed alloy exhibits good comprehensive tensile property at 350℃,with ultimate tensile strength of 153 MPa and elongation to fracture of 6.9%.Segregation of RE elements and eventually RE-rich precipitation at grain boundaries are responsible for the high strength at elevated temperature.

关键词： heat-resistant magnesium alloy rare earth microstructure phase transformation tensile property strengthening

A review of additive manufacturing technology and its application to foundry in China

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China Foundry 2021年第4期18卷 249-264页

作者： Shi-yan Tang Li Yang zi-tian fan Wen-ming Jiang Xin-wang Liu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The application of additive manufacturing technology is one of the main approaches to achieving the rapid *** manufacturing technology can directly prepare casting molds(cores)with no need of patterns,and quickly cast complex *** combination of additive manufacturing and traditional casting technology can break the constraint of traditional casting technology,improve casting flexibility,and ameliorate the working ***,additive manufacturing promotes the realization of"free casting",greatly simplifying the processing procedures and shortening the manufacturing *** paper summarizes the basic principle of additive manufacturing technology and its development situation domestically and overseas,mainly focusing on the development status of several main additive manufacturing technologies applicable to the foundry field,including three-dimensional printing,selective laser sintering,stereolithography,layered extrusion forming,***,the future development trend of additive manufacturing technology in the foundry field is prospected.

关键词： additive manufacturing rapid prototyping 3D printing casting process rapid casting

Rapid casting technology based on selective laser sintering

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China Foundry 2021年第4期18卷 296-306页

作者： Li Yang Shi-yan Tang zi-tian fan Wen-ming Jiang Xin-wang Liu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Selective laser sintering(SLS),as a kind of additive manufacturing technology,which uses a laser beam to scan and heat powder material layer by layer to form parts(models),is widely used in the field of casting,mainly for preparing casting coated sand cores,investment casting patterns,*** SLS technique facilitates rapid casting and shortens the casting production periods by eliminating mold *** this study,we reached conclusions for the basic principles and characteristics of SLS methods,and focused on the research status,key technology and development trend of SLS in the fields of forming coated sand-casting molds and investment casting patterns.

关键词： selective laser sintering additive manufacturing rapid casting coated sand investment casting pattern

Microstructure and Mechanical Properties of Ductile Cast Iron in Lost Foam Casting with Vibration

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Journal of Iron and Steel Research International 2014年第11期21卷 1049-1054页

作者： Bo-tao XIAO zi-tian fan Wen-ming JIANG Xin-wang LIU Wei LONG Qiang HU State Key Laboratory of Material Processing and Die & Mould Technology Huazhong University of Science and Technology School of Materials Science and Engineering Jiangxi Science and Technology Normal University School of Mechanical & Electrical Engineering Wuhan Institute of Technology Jiangxi Key Laboratory for Advanced Copper and Tungsten Materials Jiangxi Academy of Sciences

The microstructures and mechanical properties of the ductile cast iron （DI） specimens obtained by lost foam casting （LFC） with and without vibration were investigated. The results indicate that the number of the graphite nodule increases from 175 mm 2 of the specimens produced by LFC without vibration to 334 mm^-2 of the specimens produced by LFC with vibration, and the thickness of the ferrite shell increases. Meanwhile, the amount of the carbides decreases in the specimens produced by LFC with vibration and the granule structure then forms. These are mainly attributed to the ＂crystal shower＂ caused by the vibration. In addition, the tensile strength and elongation of DI specimens produced by LFC with vibration are improved due to the dispersion-strengthening of refined carbide and Dearlite colonv, uniform distribution of the graphite nodule, and increase of the amount of dimples and tearing edges.

关键词： ductile cast iron (DI) microstructure mechanical property mechanical vibration lost foam casting (LFC)

Effect of vibration frequency on primary phase and properties of grey cast iron fabricated by lost foam casting

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China Foundry 2020年第1期17卷 1-7页

作者： Bo-tao Xiao zi-tian fan Wen-ming Jiang Jun-huai Xiang Xue-fang Yan Jiangxi Key Laboratory of Surface Engineering Jiangxi Science and Technology Normal UniversityNanchang 330013China State Key Laboratory of Material Processing and Die&Mould Technology Huazhong University of Science&TechnologyWuhan 430074China

The properties of gray cast iron(GCI)are affected by density of matrix,size of flake graphite and primary *** this paper,the Y-type specimen of GCI was prepared by lost foam casting(LFC)with and without vibration,and the influence of vibration frequency on the density of matrix,size of primary phase,and properties of the GCI was *** results show that the length of the flake graphite and the size of the primary austenite in GCI firstly decrease and then increase with the increase of the vibration *** a vibration frequency of 35 Hz,the length of the flake graphite is the shortest,the primary austenite is the finest and the density of the matrix is the *** addition,the tensile strength,elongation and hardness of the GCI firstly increase and then decrease with the increase of the vibration frequency,due to the refinement of the primary phase and the increase of the matrix *** order to analyze the refinement mechanism of the primary phase of the GCI fabricated by the LFC with vibration,the solidification temperature fields of the GCI fabricated by the LFC with the vibration frequency of 0 and 35 Hz were *** results show that the vibration reduces the eutectic point of the GCI and increases the supercooling degree during the eutectic *** a result,the length of the flake graphite and the size of the primary austenite in GCI fabricated by LFC with the vibration frequency of 35 Hz decrease.

关键词： vibration frequency lost foam casting grey cast iron flake graphite properties

Recycling water glass from wet reclamation sewage of waste sodium silicate-bonded sand

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China Foundry 2019年第3期16卷 198-203页

作者： Li-chi Wang Wen-ming Jiang Xiao-long Gong Fu-chu Liu zi-tian fan State Key Lab of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology

Wet reclamation of waste sodium silicate-bonded sand produces much alkaline sewage and causes pollution. Recycling water glass from wet reclamation sewage of the waste sodium silicate-bonded sand can solve pollution issues and generate economic benefits. In this work, the wet reclamation sewage was filtered, and the filtrate was causticized with a quicklime powder to produce a lye. The effects of causticization temperature, causticization time, and the amount of quicklime powder on the causticization rate were studied. The lye was used to dissolve the silica in the filtration residue to prepare a sodium silicate solution. The effects of the mass of filtration residue, dissolution temperature, and dissolution time on sodium silicate modulus were studied. Finally, the recycled water glass was obtained by concentrating the sodium silicate solution, and the bonding strength of the recycled water glass was tested. The results showed that the causticization rate could be improved by increasing the amount of quicklime powder, causticization temperature, and causticization time, and the highest causticization rate was above 92%. Amorphous silica in the filtration residue dissolved in the lye. Increasing the amount of the filtration residue, dissolution temperature, and dissolution time could improve the sodium silicate modulus. The bonding strength of the recycled water glass was close to that of commercial water glass. The recycled water glass could be used as a substitute for the commercial water glass.

关键词： waste sodium silicate-bonded sand wet reclamation sewage treatment causticization recycling water glass