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Evolution of annealing twins and Recrystallization Texture in Thin-Walled Copper Tube During Heat Treatment

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Acta Metallurgica Sinica(English Letters) 2020年第12期33卷 1618-1626页

作者： Song-Wei Wang Hong-Wu Song Yan Chen Shi-Hong Zhang Hai-Hong Li Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 100049China School of Nuclear Equipment and Nuclear Engineering Yantai UniversityYantai 264005China

Thin-walled copper tubes are usually produced by multi-pass float-plug drawing *** general,the annealing treatment subsequently is necessary to release the stored energy and adjusts the *** this study,an investigation on the evolution of annealing twins as well as textures in the thin-walled(Φ6 mm×0.3 mm)copper tube underwent holding time-free heat treatment was *** backscattered diffraction analysis reveals that a large number ofΣ3 boundaries(600twin relationship)are produced at the early stage of heat treatment,which is due to the lower boundary *** the recrystallization proceeding,the migration rate of grain boundaries decreases on account of the grain growth;meanwhile,the uniqueΣ9 boundaries(38.9°relationship)are formed due to the interaction of theΣ3 *** a result,the number fractions ofΣ3 boundaries and high-angle grain boundaries decrease *** the grain growth stage,a strong recrystallization texture was formed due to the fact that the grains of Goss orientation have a growth advantage over the *** a result,the initial copper texture was transferred into the Goss texture in domination.

关键词： Copper tube annealing twin Heat treatment Electron backscattered diffraction(EBSD)analysis Recrystallization texture

Tensile deformation behavior of nickel-free high-manganese austenitic cryogenic-temperature steel

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Journal of Iron and Steel Research International 2022年第5期29卷 793-801页

作者： Xin-tian Wang Hui-bin Wu Yang Gu Li-xiong Xu Peng-cheng Zhang Qi-bo Tang National Center for Materials Service Safety University of Science and Technology BeijingBeijing100083China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China

Nickel-free high-manganese austenitic Fe–24.4Mn–4.04Al–0.057C steel was produced by smelting,and the homogenized forged billet was *** plastic deformation mechanism was investigated through tensile testing of the hot-rolled *** characterization techniques such as scanning electron microscopy,transmission electron microscopy,electron backscattered diffraction,and X-ray diffraction were used to analyze the microstructural evolution of steel under different strain *** steel had a single austenite phase,which was stable during *** hot rolling,annealing twins were observed in the microstructure of the *** steel showed an excellent combination of mechanical properties,like a tensile strength of 527 MPa,impact energy of 203 J at−196℃,and an elongation of 67%till *** the initial deformation stage,the dislocations were generated within the austenite grains,entangled and accumulated at the grain boundaries and annealing twin *** twins participated in plastic deformation and hindered the dislocation *** the deformation progressed,the dislocation slip was hindered and produced stress concentration,and the stacking faults evolved into mechanical twins,which released the stress concentration and delayed the necking.

关键词： High-manganese steel Austenite grain Tensile deformation Mechanical twin annealing twin

Microstructure Evolution and Recrystallized Behavior of Friction Stir Welding twin-Induced Plasticity Steel

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Acta Metallurgica Sinica(English Letters) 2024年第11期37卷 1947-1960页

作者： Ke Qiao Kuaishe Wang Jia Wang Zhengyang Hao Kairui Xue Jun Cai Fengming Qiang Wen Wang School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials ProcessingXi’an University of Architecture and TechnologyXi’an710055China

The restoration mechanism of twin-induced plasticity(TWIP)steel during friction stir welding(FSW)changed with the degree of the deformation,and the microstructure evolution and dynamic recrystallization are complex and *** this paper,the electron backscattered diffraction and transmission electron microscopy techniques were used to evaluate the dynamic grain structure of FSW joint of TWIP *** results showed that the dynamic recrystallization mechanisms in TWIP steel during FSW contained discontinuous dynamic recrystallization(DDRX)and continuous dynamic recrystallization(CDRX).The recrystallization mechanism transitioned from DDRX at the initial deformation stage to DDRX and CDRX at the middle deformation stage,eventually becoming primarily CDRX at the end deformation *** annealing twin boundaries(ATBs)were formed within the joint,and the straight ATBs primarily resulted from grain growth accidents,while cluster-shaped ATBs were formed through re-excitations and decomposition of specific grain boundaries.

关键词： twin-induced plasticity steel Friction stir welding Dynamic recrystallization Static recrystallization annealing twin

Effects of electric-field treatment on a Ni-base superalloy

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Rare Metals 2007年第S1期26卷 210-215页

作者： WANG Lei,LIU Yang,CUI Tong,and ZHAO Xiang School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China Northeastern Univ Sch Met & Mat Shenyang 110004 Peoples R China

The effects of electric-field treatment on the microstructure and deformation behavior of a nickel-base superalloy were *** results show that the electric-field treatment increases the ductility of the superalloy but has no evident influence on its static strength at both room and elevated temperatures,while,the strength increases but elongation changes weekly with the increasing tensile strain *** is found that the direction of microcrack propagation can be changed by the presence of the annealing twins during the tensile deformation,and it causes the increasing of the plastic deformation energy and delay of the fracture,which is considered as the reason for the increasing the ductility.

关键词： electric-field treatment nickel-base superalloy annealing twin deformation behavior strain rate

Evolution of Goss texture in thin-walled copper tube at different heat treatment temperatures

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Transactions of Nonferrous Metals Society of China 2022年第4期32卷 1205-1216页

作者： Song-wei WANG Hong-wu SONG Yan CHEN Qi YU Shi-hong ZHANG Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Jiangxi Copper Corporation Co. Ltd.Nanchang 330096China

The evolution of microstructure,textures,and mechanical properties of thin-walled copper tube during heat treatment was investigated using EBSD technique and tensile *** results show that the initial deformation textures of pre-drawn thin-walled copper tube are mainly composed of Copper and Y components,while with the increase of temperatures,the textures are transformed into a strong Goss texture *** high-resolution microstructural characterizations indicate that the new Goss recrystallized grains nucleate and grow up within the deformed Copper grains and Y grains in different mechanisms,*** tensile strength of the thin-walled copper tube decreases gradually with the increase of the temperature,while the elongation increases first and then decreases sharply due to the action of grain sizes and texture components.

关键词： thin-walled copper tube recrystallization behavior Goss texture nucleation mechanism annealing twin