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THERMODYNAMIC CALCULATION OF INTERFACE REACTIONS BETWEEN TITANIUM MELT AND SPECIAL MOLD MATERIALS

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中国有色金属学会会刊：英文版 1999年第2期9卷 14-18页

作者： Jia, Jun ding, hongsheng Guo, Jingjie Su, Yanqing Harbin Inst of Technology Harbin China

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｉｔａｎｉｕｍｃａｓｔｉｎｇｓｈａｖｅｂｅｎｗｉｄｅｌｙａｐｐｌｉｅｄｉｎｍａｎｙｒｅｇｉｏｎｓｓｕｃｈａｓａｅｒｏｎａｕｔｉｃｓ，ａｅｒｏｓｐａｃｅａｎｄｓｏｆｏｒｔｈ．Ｂｕｔｔｈｅｄｒ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｉｔａｎｉｕｍｃａｓｔｉｎｇｓｈａｖｅｂｅｎｗｉｄｅｌｙａｐｐｌｉｅｄｉｎｍａｎｙｒｅｇｉｏｎｓｓｕｃｈａｓａｅｒｏｎａｕｔｉｃｓ，ａｅｒｏｓｐａｃｅａｎｄｓｏｆｏｒｔｈ．Ｂｕｔｔｈｅｄｒａｗｂａｃｋｏｆｔｈｅｈｉｇｈｒｅ...

关键词： titaniuminterface reactionGibbs free energymoldrefractory materials

Microstructure and properties of the interlayer heat-affected zone in X80 pipeline girth welds

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Progress in Natural Science:Materials International 2020年第1期30卷 110-117页

作者： Fang Bai hongsheng ding Lige Tong Liqing Pan School of Mathematics and Physics University of Science and Technology Beijing Pipeline Institute China Petroleum Pipeline Engineering Co.Ltd. School of Energy and Environmental Engineering University of Science and Technology Beijing College of Science China Three Gorges University

The heat-affected zone between the layers of a weld metal is a sensitive and important component of girth welds in X80 ***,only a few studies have focused on the interlayer heat-afected zone(IHAZ).In this work,thermal simulation was conducted to investigate the relationship between IHAZ microstructure and *** showed that the toughness of the weld metal improved after a single welding thermal cycle but decreased after double welding thermal cycles,particularly when the weld metal was subjected to unaltered coarse grains of *** relationship between the microstructure and properties of IHAZ was established to present the correlation of toughness with granular bainite content,grain size,and high-angle grain boundary content.

关键词： Girth weld Interlayer heat-affected zone Thermal simulation Granular bainite Toughness

ANALYSIS OF OVERFLOW CRITICAL VALUE FOR TiAl BASED ALLOY MELT DURING PROCESS OF CENTRIFUGAL CASTING

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中国有色金属学会会刊：英文版 1999年第2期9卷 3-8页

作者： Guo, Jingjie Sheng, Wenbin Su, Yanqing ding, hongsheng Jia, Jun Harbin Inst of Technology Harbin China

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｉＡｌｂａｓｅｄａｌｏｙｓｈａｖｅａｔｒａｃｔｅｄａｇｒｅａｔｄｅａｌｏｆａｔｅｎｔｉｏｎｂｅｃａｕｓｅｏｆｔｈｅｉｒｐｏｔｅｎｔｉａｌｙａｔｒａｃｔｉｖｅｐｒｏｐｅｒｔｉｅｓｆｏｒｈｉｇ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｉＡｌｂａｓｅｄａｌｏｙｓｈａｖｅａｔｒａｃｔｅｄａｇｒｅａｔｄｅａｌｏｆａｔｅｎｔｉｏｎｂｅｃａｕｓｅｏｆｔｈｅｉｒｐｏｔｅｎｔｉａｌｙａｔｒａｃｔｉｖｅｐｒｏｐｅｒｔｉｅｓｆｏｒｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｓｔｒｕ...

关键词： angular velocityTiAl base alloypressure distributioncentrifugal casting

EVAPORATION BEHAVIOR OF COMPONENTS IN Ti-15-3 MELT DURING ISM PROCESS

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中国有色金属学会会刊：英文版 1998年第4期8卷 8-12页

作者： Guo, Jingjie Liu, Yuan Su, Yanqing ding, hongsheng Jia, Jun Harbin Inst of Technology Harbin China

ＩＮＴＲＯＤＵＣＴＩＯＮＭｅｔａｓｔａｂｌｅβｔｉｔａｎｉｕｍａｌｏｙｓａｒｅｎｏｗｆｉｎｄｉｎｇｐｒｏｇｒｅｓｉｖｅｌｙｍｏｒｅａｐｐｌｉｃａｔｉｏｎｓ，ｅｓｐｅｃｉａｌｙｏｗｉｎｇｔｏｔｈｅｉｒｇｏｏｄｆｏｒｍｉ... 详细信息

ＩＮＴＲＯＤＵＣＴＩＯＮＭｅｔａｓｔａｂｌｅβｔｉｔａｎｉｕｍａｌｏｙｓａｒｅｎｏｗｆｉｎｄｉｎｇｐｒｏｇｒｅｓｉｖｅｌｙｍｏｒｅａｐｐｌｉｃａｔｉｏｎｓ，ｅｓｐｅｃｉａｌｙｏｗｉｎｇｔｏｔｈｅｉｒｇｏｏｄｆｏｒｍｉｎｇｐｒｏｐｅｒｔｉｅｓ［１］．Ｔ...

关键词： Ti 15 3 alloy evaporation loss ISM process

Cobalt-doping effects in single crystalline and polycrystalline EuFe_(2-x)Co_xAs_2 compounds

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Science China(Physics,Mechanics & Astronomy) 2010年第7期53卷 1212-1215页

作者： CHEN XiaoBo REN ZhiAn ding hongsheng LIU LiHua Institute of Physics and Beijing National Laboratory for Condensed Matter Physics Chinese Academy of SciencesBeijing 100190China Department of Physics University of Science&Technology BeijingBeijing 100083China

A series of Co-doped EuFe2-xCoxAs2 compounds were prepared in both of single crystalline and polycrystalline *** Co-doping effects on the crystal structure,electrical resistivity and magnetic susceptibility were systematically *** was found in polycrystalline Co-doped samples from zero resistivity effects,with the highest onset superconducting transition temperature at 26 K in the optimum doped EuFe1.84Co0.16As2 *** due to the stronger competition between the superconducting order and the Eu2+ magnetic order,the zero resistivity effect is absent in the Co-doped single crystal samples.

关键词： iron-pnictide high-Tc EuFe2As2 Co-doping superconductivity

Optimum Design of Processing Parameters during ISM Process of Ti-47Ni-9Nb

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Journal of Materials Science & Technology 2001年第1期17卷 75-76页

作者： Jingjie GUO Yuan LIU hongsheng ding Yanqing SU Jun JIA School of Materials Science and Engineering Harbin institute of TechnologyHarbin 150001China

Using direct finite difference method, a numerical model for simulating the temperature field in the charge during induction skull melting (ISM) has been developed. On the basis of the model, the temperature field in Ti- 47Ni-9Nb ingot has been calculated under various melting conditions. Finally, the processing parameters (melting power, melting-down time and the final melt temperature) have been optimized.

关键词： TITANIUM

An innovative method for the microstructural modification of TiAl alloy solidified via direct electric current application

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Journal of Materials Science & Technology 2019年第1期35卷 23-28页

作者： Zhanxing Chen hongsheng ding Ruirun Chen Shiqiu Liu Jingjie Guo Hengzhi Fu National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and Engineering Harbin Institute of Technology

Ti-48Al-2Cr-2Nb alloy solidified with the application of direct electric current has a refined and homogeneous microstructure without segregation. We observed an initial decrease followed by a subsequent increase in grain size and lamellar spacing, with the increase in current density. Similar trend can also be obtained by varying the amount of α2-phase(Ti_3Al). Using a directional solidification processing method,the columnar crystal microstructure transforms into an equiaxed crystal microstructure at a current density of 32–64 m A/mm^2. High dislocation density is also introduced with a minimum cross-sectional grain size of 460 μm at a current density of 64 mA/mm^2. The application of electric current alters the free energy of the critical nucleus and temperature via joule heating, causing a transformation from a columnar grain microstructure into an equiaxed grain microstructure. The increase in current density leads to a rise of the nucleation rate, and a resulting undercooling combined with temperature gradient contribute to growth of the primary phase, which finally results in grain coarsening at a critical current density of 96 mA/mm^*** climb and cross-slip of dislocation and the migration of grain boundary ultimately create variable lamellae spacing of TiAl alloy.

关键词： TiAl Solidification Direct electric current Microstructure

Using multiple regression analysis to predict directionally solidified TiAl mechanical property

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Journal of Materials Science & Technology 2022年第9期104卷 285-291页

作者： Seungmi Kwak Jaehwang Kim hongsheng ding Xuesong Xu Ruirun Chen Jingjie Guo Hengzhi Fu National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Carbon Materials Application R&D Group Korea Institute of Industrial TechnologyJeonju 54853 Republic of Korea

The mechanical properties of TiAl alloy prepared by directional solidification were predicted through a machine learning algorithm *** composition,input power,and pulling speed were designated as input variables as representative factors influencing mechanical properties,and multiple linear regression analysis was conducted by collecting data obtained from the *** this study,the R^(2)value of the tensile strength prediction result was 0.7159,elongation was 0.8459,nanoindentation hardness was 0.7573,and interlamellar spacing was *** the R^(2)value of the elongation obtained through the analysis was higher than the R^(2)value of the tensile strength,it was confirmed that the elongation had a closer relationship with the input variables(composition,input power,pulling speed)than the tensile *** adding the elongation to the tensile strength as an input variable,it was observed that the R^(2)value was further *** tensile test prediction results were divided into four groups:The group with the lowest residual value(predicted value-actual value)was designated as group A,and the group with the largest residual value was designated as group *** comparing the values of group A and group D,more overpredictions occurred in group A,while more under predictions occurred in group *** the residuals and R^(2)values,the cause of the well-prediction was studied,and through this,the relationship between the mechanical properties and the microstructure was quantitatively investigated.

关键词： Directionally solidified TiAl alloy Microstructure control Tensile strength Interlamellar space Prediction Multiple linear regression

Numerical simulation of electro-magnetic and flow fields of TiAl melt under electric field

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China Foundry 2010年第3期7卷 241-247页

作者： Zhang Yong ding hongsheng Jiang Sanyong Chen Ruirun Guo Jingjie National Key Laboratory for Precision Heat Processing of Metals Harbin 150001 China School of Electrical Engineering and Automation Harbin Institute of Technology Harbin 150001 China

This article aims at building an electromagnetic and fluid model, based on the Maxwell equations and Navier-Stokes equations, in TiAl melt under two electric *** (Finite Element Method) and APDL (ANSYS Parametric Design Language) were employed to perform the simulation, model setup, loading and problem *** melt in molds of same cross section area with different flakiness ratio (***/depth) under the load of sinusoidal current or pulse current was analyzed to obtain the distribution of electromagnetic field and flow *** results show that the induced magnetic field occupies sufficiently the domain of the melt in the mold with a flakiness ratio of 5:*** melt is driven bipolarly from the center in each electric *** is also found that the pulse electric field actuates the TiAl melt to flow stronger than what the sinusoidal electric field does.

关键词： numerical simulation TiAI melt electromagnetic field flow field