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Effect of intercritical deformation on tensile performance of a low-carbon Si-Mn steel processed by quenching and bainitic partitioning

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Journal of Iron and Steel Research(International) 2020年第2期27卷 208-216页

作者： Ya-qiang Tian Zhong-qian Cao Wang Li Hong-bo Pan Xiao-ping Zheng Jin-ying Song Ying-li Wei Lian-sheng Chen Key Laboratory of the Ministry of Education for Modern Metallurgy Technology North China University of Science and TechnologyTangshan 063210HebeiChina Key Laboratory of Metallurgical Emission Reduction and Resources Recycling of Ministry of Education Anhui University of TechnologyMa'anshan 243002AnhuiChina

The effect of intercritical deformation on retained austenite and tensile performance of a low-carbon Si-Mn steel in modified quenching and bainitic partitioning processes was evaluated.The results showed that the intercritical deformation can play a positive role in stabilizing and refining the retained austenite,and possessed promising potential in balancing tensile strength and ductility of multiphase high-strength steels.The experimental low-carbon Si-Mn steel exhibited multiphase configuration comprising polygonal ferrite,granular bainite and granular structure after two different modified quenching and bainitic partitioning processes,and the bainitic ferrite laths got refined by intercritical deformation.The volume fraction of retained austenite in film-like and blocky morphology was increased from 11.5%to 13.9%due to applied intercritical deformation,and the larger amount of retained austenite provided the sufficient transformation-induced plasticity effect and resulted in enhanced work hardening degree;in response,enhanced ultimate tensile strength 1260 MPa and fracture elongation 22.1%were obtained,leading to increased product of strength and elongation in value of 27.7 GPa% compared to 20.8 GPa% of undeformed structure.

关键词： Bainitic steel Intercritical deformation Retained austenite Instantaneous work hardening index Transformation-induced plasticity effect

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Super-resolution reconstruction and higher-degree function deformation model based matching for Chang’E-1 lunar images

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Science China(Technological Sciences) 2009年第12期52卷 3468-3476页

作者： LI LiChun YU QiFeng YUAN Yun SHANG Yang LU HongWei SUN XiangYi College of Aerospace and Material Engineering National University of Defense TechnologyChangsha 410073China The Equipment Research Institute of PLA’s Second Artillery Beijing 10085China

This article intends to solve the matching problem of 2C level lunar images by Chang’E-1(CE-1)lunar probe satellite.A line-scanner image matching method is proposed which represents deformation by the quadric function along the camera motion direction and bases on the deformation model for a relief terrain’s imaging on sensors of the satellite borne three-line scanner camera.A precise matching is carried out for the normal view,the frontward view,and the backward view images of the CE-1 by combining the proposed method with the standard correlation method.A super-resolution(SR)reconstruction algorithm based on the wavelet interpolation of non-uniformly sampled data is also adopted to realize SR reconstruction of CE-1 lunar images,which adds the recognizable targets and explores CE-1 lunar images to the full.

关键词： image matching 3-line-scanner quadric function deformation super resolution Chang’E-1 lunar image

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Texture Evolution Induced by deformation in Aluminum Alloy

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上海交通大学学报 2004年第Z2期38卷 206-211页

作者： Zhao Yixi Lin zhongqin Li shuhui Yu zhongqi School of Mechanical Engineering Shanghai Jiaotong Univ. Shanghai200030 China School of Mechanical Engineering Shanghai Jiaotong Univ. Shanghai200030 China School of Mechanical Engineering Shanghai Jiaotong Univ. Shanghai200030 China School of Mechanical Engineering Shanghai Jiaotong Univ. Shanghai200030 China

The lower formability of aluminum alloy sheets is the inherent characteristic of the material. During material forming processes the material undergoes a complex strain history. In this paper, the effect of crystallographic texture induced by deformation in aluminum sheet is studied. The transformation of crystallographic textures induced by uniaxial tensile, cup drawing and bulge tests was measured through X-ray diffraction and analyzed. The author studied the texture evolution rule under different strain paths. A qualitative relationship between the deformation and texture evolution has been founded.

关键词： texture evolution aluminum alloy deformation strain path

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A volume of fluid simulation of the steady deformation and the drag of a single droplet in a flowing gas

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Journal of Hydrodynamics 2021年第2期33卷 334-346页

作者： Zhi-bin Wang Zhong-wei Yang Lie-jin Guo Ren-jie Zhao State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChendu 610500China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

A method is proposed to investigate the steady deformation and the drag of a single droplet in a flowing gas at a high Reynolds number.The volume of fluid(VOF)method is used to model the droplet surface structure.The direct numerical simulation(DNS)method is used to model the gas flow field.In order to avoid the effect of the droplet acceleration on the drag and reduce the computation cost,a body force is added to the droplet to make it fixed at a constant position.The body force is determined by using the Newton iteration procedure.The simulated droplet aspect ratio and the drag coefficient agree well with the published experimental data.Meanwhile,the sources of the drag are analyzed and the effect of the Reynolds number and the Weber numbers on the droplet deformation and the drag are studied.The drag mainly comes from the pressure difference between the droplet-leading zone and the trailing zone,and the turbulence wake would increase the drag.

关键词： Droplet deformation steady drag volume of fluid(VOF) turbulent flow drag force

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Hot deformation map and its application of GH4706 alloy

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International Journal of Minerals,Metallurgy and Materials 2014年第5期21卷 462-468页

作者： Shuo Huang Lei Wang Xin-tong Lian Guang-pu Zhao Fang-fei Li Xiao-min Zhang Key Lab for Anisotropy and Texture of Materials Northeastern University Department of High Temperature Materials Central Iron and Steel Research Institute

The hot deformation behaviors of GH4706 alloy were investigated using compression tests in a deformation temperature range from 900℃ to 1200℃ with a strain rate range of 0.001-1 s-1. Hot processing maps were developed on the basis of the dynamic material model and compression data. A three-dimensional distribution of power dissipation parameter （η） with strain rate and temperature reveals that η decreases in sensitivity with an increase in strain rate and a decrease in temperature. Microstructure studies show that the grain size of GH4706 alloy increases when η is larger than 0.32, and the microstructure exhibits local deformation when r/is smaller than 0.23. The hot processing map at the strain of 0.7 exposes a domain peak at 7=0.32 for the temperature between 940℃ and 970℃ with the strain rate from 0.015 s-1 to 0.003 s-1, and these are the optimum parameters for hot working.

关键词： superalloys nickel alloys deformation microstructure dynamic recrystallization

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Cold extrusion deformation behavior of medium carbon steel after quenching and tempering

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中国有色金属学会会刊：英文版 2009年第S3期19卷 552-557页

作者：胡成亮赵震尹冠人袁兆峰徐祥龙 Department of Plasticity Technology Shanghai Jiao Tong University Jiangsu Sunway Precision Forging Co. Ltd.

By taking 40Cr as a specific object, cold extrusion deformation behavior of medium carbon steel after quenching and tempering was studied by experimental works. The influence of deformation extent (10%-50%), cone angle of die (90 °-120 °), hardness after quenching and tempering (HRC21-29) and lubricated condition on the forming load was analyzed. The results show that there is no central bursting and micro crack in the inner of the extruded specimen, and the forming quality is good. The double-peak phenomenon takes place at the front-end of the specimen; the double-peak index increases with deformation extent, and larger deformation can avoid the double-peak phenomenon. The deformation extent is the most important influencing factor, and the lubricated condition almost has no influence, which means that the phosphate coating plus soap process is still a proper lubrication method for cold extrusion of medium carbon steel after quenching and tempering. By investigating the microscopic structure before and after deformation, the initial equiaxed grain is elongated in the extrusion direction, and this feature is more significant at the front-end of specimen.

关键词： medium carbon steel quenching and tempering cold extrusion deformation behavior microstructure

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Hot compression deformation behavior of biomedical Ni-Ti alloy

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Rare Metals 2019年第7期38卷 609-619页

作者： Zhen Wang Xiao-Wen Xu Bing Zhang School of Physics and Electronics Central South University Changsha 410083 China School of Basic Medical Science Central South University Changsha 410083 China School of Metallurgical Engineering Xi'an University of Architecture and Technology Xi'an 710000. China

Biomedical Ti-55.78 (wt%) Ni alloy samples were prepared by vacuum induction melting, and their hot compression deformation behavior was studied in the deformation temperature range of 750-950℃, the strain rate range of 0.001-1.000 s^-1 and the true strain range of 0.1 -0.7. The constitutive equation of the as-cast biomedical Ni-Ti alloy was established based on the Arrhenius constitutive model, and error analysis of the constitutive equation was carried out. The processing zone and unstable thermal deformation zone of the as-cast biomedical Ni-Ti alloy were obtained by establishing hot processing maps based on a dynamic material model. The results showed that deformation temperature and strain rate were the main factors affecting the flow stress. The results of error verification of the constitutive equation show that the predicted flow stress curves agree well with the measured ones. Therefore, the constitutive equation based on Arrhenius can accurately predict the high temperature flow stress of as-cast biomedical Ni-Ti alloy. The optimum parameters for forging process of biomedical Ni-Ti alloy are the strain rate less than 0.003 s^-1 and the hot deformation temperature range of 930-950℃.

关键词： Biomedical Ni-Ti alloy Hot compression deformation Constitutive equation Hot processing map

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Multi-temporal InSAR for Urban deformation Monitoring:Progress and Challenges

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雷达学报（中英文） 2020年第2期9卷 277-294页

作者： WU Songbo LE Yongyao ZHANG Lei DING Xiaoli Department of Land Surveying and Geo-Informatics The Hong Kong Polytechnic UniversityHung HomKLNHong Kong 999077China Xi’an Engineering Investigation and Design Research Institute of China National Nonferrous Metals Industry Co.Ltd. Xi’an 710000China

Multi-temporal Interferometric Synthetic Aperture Radar(MT-InSAR) is one of the most powerful Earth observation techniques, especially useful for measuring highly detailed ground deformation over large ground areas. Much research has been carried out to apply MT-InSAR to monitor ground and infrastructure deformation in urban areas related to land reclamation, underground construction and groundwater extraction.This paper reviews the progress in the research and identifies challenges in applying the technology, including the inconsistency in coherent point identification when different approaches are used, the reliability issue in parameter estimation, difficulty in accurate geolocation of measured points, the one-dimensional line-of-sight nature of InSAR measurements, the inability of making complete measurements over an area due to geometric distortions, especially the shadowing effects, the challenges in processing large SAR datasets, the decrease of the number of coherent points with the increase of the length of SAR time series, and the difficulty in quality control of MT-InSAR results.

关键词： Urban deformation Monitoring Multi-temporal InSAR

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Plastic deformation behavior of a nickel-based superalloy on the mesoscopic scale

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Journal of Materials Science & Technology 2020年第5期40卷 146-157页

作者： Qiang Zhu Chuanjie Wang Kai Yang Gang Chen Heyong Qin Peng Zhang School of Materials Science and Engineering Harbin Institute of Technology at WeihaiWeihai 264209China Central Iron&Steel Research Institute Beijing 100081China

Nickel-based superalloys have become the key materials of micro-parts depending on excellent mechanical properties at high temperatures.The plastic deformation behavior is difficult to predict due to the occurrence of size effect on the mesoscopic scale.In this paper,the effect of specimen diameter to grain size ratio(D/d)on the flow stress and inhomogeneous plastic deformation behavior in compression of nickel-based superalloy cylindrical specimens was investigated on the mesoscopic scale.The results showed that when D/d is less than 9.7,the flow stress increases with the grain size.Aiming at this phenomenon,a flow stress size effect model considering compressive strain partitioning was established.The calculated flow stress values agree well with the experimental values,thus revealing the effect of D/d on the flow stress in compression of nickel-base superalloy on the mesoscopic scale.The inhomogeneous plastic deformation during compression deformation increases with the grain size.The end surface profiles evolve from a regular circular shape to an irregular shape with the grain size.The surface folding phenomenon occurs only in partially compressed specimen with a few grains across the diameter.Crystal plasticity finite-element(CPFE)simulation of compression deformation on the mesoscopic scale real-time displayed the evolution of microstructure.The study of this paper has important guiding significance for understanding the influence of D/d on the compression deformation behavior of nickel-based superalloy on the mesoscopic scale.

关键词： Nickel-based superalloy Size effect Compression deformation Surface morphology Crystal plasticity Mesoscopic scale

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TENSILE　deformation　AND　FRACTURE　BEHAVIOR　OF　Ti_3Al-Nb　ALLOY　AT　HIGH　TEMPERATURE

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中国有色金属学会会刊：英文版 1997年第1期7卷 76-82页

作者： Wu, Ying Zhen, Liang Yang, Dezhuang Harbin Inst of Technology Harbin China

ＴＥＮＳＩＬＥＤＥＦＯＲＭＡＴＩＯＮＡＮＤＦＲＡＣＴＵＲＥＢＥＨＡＶＩＯＲＯＦＴｉ３ＡｌＮｂＡＬＬＯＹＡＴＨＩＧＨＴＥＭＰＥＲＡＴＵＲＥ①ＷｕＹｉｎｇ，ＺｈｅｎＬｉａｎｇ，ＹａｎｇＤｅｚｈｕａｎｇＳｃｈｏｏｌｏｆＭ... 详细信息

ＴＥＮＳＩＬＥＤＥＦＯＲＭＡＴＩＯＮＡＮＤＦＲＡＣＴＵＲＥＢＥＨＡＶＩＯＲＯＦＴｉ３ＡｌＮｂＡＬＬＯＹＡＴＨＩＧＨＴＥＭＰＥＲＡＴＵＲＥ①ＷｕＹｉｎｇ，ＺｈｅｎＬｉａｎｇ，ＹａｎｇＤｅｚｈｕａｎｇＳｃｈｏｏｌｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎ...

关键词： Ti 3Al Nb alloy tensile deformation fracture

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