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Effects of microrolling parameters on the microstructure and deformation behavior of pure copper

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International Journal of Minerals,Metallurgy and Materials 2018年第1期25卷 45-52页

作者： yi Jing Hong-mei Zhang Hao Wu Lian-jie Li Hong-bin Jia zheng-yi jiang School of Material and Metallurgy University of Science and Technology Liaoning School of Mechanical Materials and Mechatronic EngineeringUniversity of Wollongong An-steel Group Da-Xing Plant

Microrolling experiments and uniaxial tensile tests of pure copper under different annealing conditions were carried out in this paper. The effects of grain size and reduction on non-uniform deformation, edge cracking, and microstructure were studied. The experimen- tal results showed that the side deformation became more non-uniform, resulting in substantial edge bulge, and the uneven spread increased with increasing grain size and reduction level. When the reduction level reached 80% and the grain size was 65 μm, slight edge cracks occurred. When the grain size was 200 μm, the edge cracks became wider and deeper. No edge cracks occurred when the grain size was 200 μm and the reduction level was less than 60%; edge cracks occurred when the reduction level was increased to 80%. As the reduction level increased, the grains were gradually elongated and appeared as a sheet-like structure along the rolling direction; a fine lamellar structure was obtained when the grain size was 20 lam and the reduction level was less than 60%.

关键词： micro-rolling grain size effect reduction deformation behavior microstructure pure copper

Influence of hot rolling on microstructure and mechanical characteristics of explosive-welded FSS/CS laminate

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Journal of Iron and Steel Research International 2018年第5期25卷 572-579页

作者： Xiao-rong Yang Li-feng Ma Guang-ming Liu Guang-hui Zhao zheng-yi jiang Shanxi Provincial Key Laboratory of Metallurgical DeviceDesign Theory and Technology Taiyuan University ofScience and Technology Taiyuan 030024 Shanxi China School of Mechanical Materials and Mechatronic Engineering University of Wollongong Wollongong 2522Australia

The influence of hot rolling on the microstructure and subsequent mechanical characteristics of explosive-welded ferritic stainless steel （FSS）/carbon steel （CS） laminate was investigated. The results indicate that by hot rolling, decarburization layer disappears and a uniform structure is gained in CS side, but ferrite grains and carbides in constituent FSS form an uneven band microstructure which is denser at superficial zone than near the interface. The transmission electron microscopy results indicate that the layers adhering to the interface show typical deformed microstructure features, i.e., stream-like strips and elongated grains in FSS plates, carbide precipitates and bended cementite fragments in CS plates; and high-density dislocations in both plates, With hot rolling, various mechanical strengths and hardness are increased, while the elongation percentage is diminished. Examination of fractographs from tensile tests reveals predominately small dimples for explosive-welded specimens, whereas both big dimples and cleavage fracture for rolled specimens. Stereomicroscopic fractographs taken on shear samples indicate that the surfaces of explosive-welded specimens exhibit uniform deformation, but uneven deformation is displayed for that of rolled specimens. These results indicate that hot rolling is beneficial to improve the strength of explosive-welded FSS/CS laminate but not good for enhancing its plasticity.

关键词： Hot rolling · Composite steel plate · Interface ·Ferritic stainless steel ·Carbon steel

Effect of large load on the wear and corrosion behavior of high-strength EH47 hull steel in 3.5wt%NaCl solution with sand

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International Journal of Minerals,Metallurgy and Materials 2020年第11期27卷 1525-1535页

作者： Hong-mei Zhang Yan Li Ling Yan Fang-fang Ai Yang-yang Zhu zheng-yi jiang School of Material and Metallurgy University of Science and Technology LiaoningAnshan 114051China State Key Laboratory of Metal Material for Marine Equipment and Application Anshan Iron and Steel Research Institute of AnGang GroupAnshan 114009China School of Mechanical Materials and Mechatronic EngineeringUniversity of WollongongWollongong NSW 2522Australia

To simulate the wear and corrosion behavior of high-strength EH47 hull steel in a complicated marine environment in which seawater,sea ice,and sea sand coexist,accelerated wear and corrosion tests were performed in a laboratory setting using a *** effect of large loads on the behavior of abrasion and corrosion in a 3.5wt%NaCl solution with ice and sand to simulate a marine environment were *** experimental results showed that the coefficient of friction(COF)decreases with increasing working load;meanwhile,the loading force and sand on the disk strongly influence the *** mechanisms of friction and the coupling effect of abrasion and corrosion in the 3.5wt%NaCl solution with sand were the wear and corrosion mechanisms;furthermore,the wear mechanism exerted the predominant effect.

关键词： friction marine environment wear mechanism tribological tests

Stir casting process for manufacture of Al-SiC composites

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Rare Metals 2017年第7期36卷 581-590页

作者： Shahin Soltani Rasoul Azari Khosroshahi Reza Taherzadeh Mousavian zheng-yi jiang Alireza Fadavi Boostani Dermot Brabazon Faculty of Materials Engineering Sahand University ofTechnologyTabriz 37200-000Iran School of Mechanical Materials and Mechatronic EngineeringUniversity of WollongongWollongongNSW 2522Australia Advanced Processing Technology Research Centre School of Mechanical and Manufacturing EngineeringDublin CityUniversityDublin 9Ireland

Stir casting is an economical process for the fabrication of aluminum matrix composites. There are many parameters in this process, which affect the final microstructure and mechanical properties of the compos- ites. In this study, micron-sized SiC particles were used as reinforcement to fabricate A1-3 wt% SiC composites at two casting temperatures （680 and 850 ℃） and stirring periods （2 and 6 min）. Factors of reaction at matrix/ceramic interface, porosity, ceramic incorporation, and agglomera- tion of the particles were evaluated by scanning electron microscope （SEM） and high-resolution transition electron microscope （HRTEM） studies. From microstructural char- acterizations, it is concluded that the shorter stirring period is required for ceramic incorporation to achieve metal/ce- ramic bonding at the interface. The higher stirring tem- perature （850 ℃） also leads to improved ceramic incorporation. In some cases, shrinkage porosity and intensive formation of A14C3 at the metal/ceramic interface are also observed. Finally, the mechanical properties of the composites were evaluated, and their relation with the corresponding microstructure and processing parameters of the composites was discussed.

关键词： Aluminum matrix composite Microstructure Mechanical properties Stir casting

Analysis of Fishscaling Resistance of Low Carbon Heavy Plate Steels

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Journal of Iron and Steel Research International 2014年第4期21卷 469-475页

作者： Ai-wen ZHANG zheng-yi jiang Dong-bin WEI Si-hai JIAO Chun XU Faculty of Engineering University of WollongongWollongong 2522NSWAustralia Research Institute Baoshan Iron and Steel Co.Ltd. Department of Material Science and Engineering Shanghai Institute of Technology

The precipitates and hydrogen permeation behavior in three kinds of hot rolled low carbon heavy plate steels for enameling were analyzed; then, both sides of the steels were enameled. The experimental results show that a large amount of coarse Ti4 Cz $2 and fine Ti（C, N） particles exist in the optimized Ti-bearing steel, quite a lot of fine Ti（C,N） particles exist in the optimized carbon steel, but only a little bit fine Ti（C,N） particles exist in the carbon steel. The fishscaling resistance of the steels can be correlated to the effective hydrogen diffusion coefficient, and a model of correlation between the effective hydrogen diffusion coefficient and the volume fraction of the precipitates was established and verified. The effective hydrogen diffusion coefficient should be lower than 3.96×10-6 cm2/s to avoid fishscaling in heavy plate steels.

关键词： fishscaling resistance hydrogen permeation precipitate enameling

A review of the effect of tungsten alloying on the microstructure and properties of steels

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Tungsten 2023年第4期5卷 440-466页

作者： Jun-Jie Lian Xiao-Guang Ma zheng-yi jiang Chong Soo Lee Jing-Wei Zhao College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan030024China Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment Ministry of EducationTaiyuan030024China Taiyuan University of Technology-University of Wollongong(TYUT-UOW)Joint Research Center Taiyuan University of TechnologyTaiyuan030024China School of Mechanical MaterialsBiomedical and Mechatronic EngineeringUniversity of WollongongWollongongNSW2522Australia TYUT‑UOW Joint Research Center University of WollongongWollongongNSW2522Australia Graduate Institute of Ferrous and Energy Materials Technology Pohang University of Science and TechnologyPohang37673South Korea

With the continuous development of science and technology,the increasingly severe service environment makes people put forward higher requirements for the performance of alloy *** has unique properties such as excellent strength,high density and good hardness,and its addition as an alloying element will change the properties of alloy *** paper aims to summarize the effect of the addition of tungsten on the micro structure and mechanical properties of alloy *** background of research and application of tungsten alloyed steel is presented ***,the preparation methods of tungsten alloyed steel are ***,the effect of tungsten incorporation on the microstructure of alloy steel is ***,the effects of tungsten addition on the mechanical properties,corrosion resistance and hydrogen embrittlement resistance of the alloy steel are *** review provides an outlook on the development of tungsten alloyed steel,which will stimulate more in-depth research and ultimately promote the practical application of tungsten alloyed steel.

关键词： Tungsten Alloy steel Microstructure Properties

Effects of magnetic field and hydrostatic pressure on the antiferromagnetic-ferromagnetic transition and magneto-functional properties in Hf_(1-x)Ta_(x)Fe_(2)alloys

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Tungsten 2023年第4期5卷 503-511页

作者： Feng-Hua Chen Hai-Bo Xie Ming-Shuai Huo Hui Wu Lian-Jie Li zheng-yi jiang School of Mechanical MaterialsMechatronic and Biomedical EngineeringUniversity of WollongongWollongongNSW2522Australia The Key Laboratory of Magnetic and Electric Functional Materials and Applications of Shanxi Province Taiyuan University of Science and TechnologyTaiyuan030024China

In this study,the thermal expansion of Hf_(1-x)Ta_(x)Fe_(2)(x=0.10,0.13,0.15)compounds by adjusting the Ta concentration was successfully *** magnetocaloric properties,hydrostatic pressure affecting the antiferromagnetic-ferromagnetic transition,and magnetostriction in the low magnetic field were ***ΔS_(M)values of 3.3 J·(kg-K)^(-1)and 3.6 J·(kg·K)^(-1)were obtained under magnetic fields of 10 kOe and 15 kOe in the Hf_(0.85)Ta_(0.15)Fe_(2),*** the antiferromagnetic-ferromagnetic state transformation process under hydrostatic pressure up to 0.8 GPa,the state temperature does not decrease in a strictly linear *** magnetostrictive properties of 0.12%were obtained at a magnetic field of 10 *** kind of alloy is supposed to be controlled under hydrostatic pressure to obtain good magnetic refrigeration performance and magnetostrictive properties.

关键词： Magnetoelastic transition Magnetocaloric effect Hydrostatic pressure Hf1-xTaxFe2 compounds Magnetostriction

Interface Analysis and Hot Deformation Behaviour of a Novel Laminated Composite with High-Cr Cast Iron and Low Carbon Steel Prepared by Hot Compression Bonding

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Journal of Iron and Steel Research International 2015年第5期22卷 438-445页

作者： zheng-yi jiang Xing-jian GAO Sheng-li LI Hong-mei ZHANG Deng-fu CHEN Jian-zhong XU School of Materials and Metallurgy University of Science and Technology Liaoning School of Mechanical Materials and Mechatronic EngineeringUniversity of Wollongong College of Materials Science and Engineering Chongqing University State Key Laboratory of Rolling and Automation Northeastern University

A hot compression bonding process was developed to prepare a novel laminated composite consisting of high-Cr cast iron （HCCI） as the inner layer and low carbon steel （LCS） as the outer layers on a Gleeble 3500 ther- momechanicat simulator at a temperature of 950 ℃ and a strain rate of 0. 001 s 1. Interfacial bond quality and hot deformation behaviour of the laminate were studied by mierostructural characterisation and mechanical tests. Experi- mental results show that the metallurgical bond between the constituent metals was achieved under the proposed bonding conditions without discernible defects and the formation of interlayer or intermetallic layer along the inter- face. The interfacial bond quality is excellent since no deterioration occurred around the interface which was deformed by Vickers indentation and compression test at room temperature with parallel loading to the interface. After well cladding by the LCS, the brittle HCCI can be severely deformed （about 57 % of reduction） at high temperature with crack-free. This significant improvement should be attributed to the decrease of crack sensitivity due to stress relief by soft claddings and enhanced flow property of the HCCI by simultaneous deformation with the LCS.

关键词： bonding laminated metal composite interface structure hot working high-Cr cast iron

Overview:Development of Clean Steel Production at Baosteel

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Journal of Iron and Steel Research International 2011年第S2期18卷 36-41页

作者： HUANG Zong-ze,zheng yi-yu,jiang Xiao-fang,CUI Jian(Baoshan Iron and Steel Co Ltd.Shanghai 201900,China) Baoshan Iron & Steel Co Ltd Shanghai 201900 Peoples R China

The development of clean steel technology at Baosteel can be dated back to the first production of IF steels and pipeline steels in the early *** the technology has gradually covered nearly the whole range of *** progressive development is introduced in the overview including the levels of cleanliness for some steel grades at *** technologies at different processes for the production of clean steel and the removal of some impurity elements in molten steel are also *** are given on the future research and development of clean steel technology at Baosteel in the aim to keep a sustainable development,which should focus on the basic research,inclusion control and making efficient use of inclusions,as well as stable and reliable low-cost manufacturing technology,removal of harmful residual elements,and the expanding of the technology to stainless steels and special steels.

关键词： clean steel inclusion secondary refining