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Microstructure and hot ductility behavior of Ni-based superalloy U720Li with boron addition

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Rare Metals 2021年第5期40卷 1145-1154页

作者： Guang-Di Zhao Fang Liu xi-min zang Wen-Ru Sun School of Material and Metallurgy University of Science and Technology LiaoningAnshan 114051China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

High-alloyed superalloy U720 Li is difficult to be processed through the conventional cast and wrought *** is an important strengthening element for superalloys,but the role of boron in the hot ductility of U720 Li alloy is not *** study is focused on the effect of boron addition,in the range of<0.0005 wt%-0.0240 wt%,on the microstructure and hot ductility behavior of superalloy U720 *** is found that boron addition significantly increases the content of eutectic(γ+γ’)and greatly affects the degree of continuity of the grain boundary eutectic(γ+γ’)*** addition dramatically worsens the 1100℃ tensile ductility of conventional cast U720 Li alloy and causes a change in tensile fracture mode from transgranular to *** eutectic(γ+γ’)represents the most effective site for crack *** deteriorates the hot ductility mainly by promoting the continuous precipitation of eutectic(γ+γ’)along the grain boundary.

关键词： Boron U720Li Eutectic(γ+γ’) Hot ductility Fracture mechanism

Modeling of flow and temperature distribution in electroslag remelting withdrawal process for fabricating large-scale slab ingots

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Journal of Iron and Steel Research International 2017年第6期24卷 569-578页

作者： Wan-ming Li Zhou-hua Jiang xi-min zang xin Deng School of Material and Metallurgy University of Science and Technology Liaoning School of Metallurgy Northeastern University

Currently, the market demands for large-scale and high-quality slab ingots are increasing significantly. A novel electroslag remelting withdrawal （ESRW） process with two series-connected electrodes and a T- shaped mould was developed to produce large-scale and high-quality slab ingots. It is very difficult to ob- tain large slab ingots with good surface quality and high width-to-thickness ratio. And it is not efficient for improving the quality of slab ingots by using trial-and-error-based approaches because the ESRW mecha- nisms are very complex. Thus, a three-dimensional mathematical model was developed to determine the relationship between process parameters and physical phenomena during the ESRW process. The relation- ship between the temperature field of the ESRW process and the surface quality of slab ingots was estab- lished. A good agreement between the simulated and measured temperature fields of slab ingots was ob- tained. The results indicate that the maximum values of current density, electromagnetic force and Joule heat all occur at the electrode-slag interface between the two electrodes. It can be found that the flow is turbulent and the temperature distribution is uniform in the slag pool with the influences of buoyancy and electromagnetic force. The wrinkles in the narrow faces of slab ingots are caused by the relatively lower in- put power. Increasing the electrode width and reducing the curvature can significantly improve the surface quality of slab ingots.

关键词： Electroslag remeltingwithdrawal processLarge-scale slabSurface qualityWrinkleFlowTemperature field

Comprehensive model for a slag bath in electroslag remelting process with a current-conductive mould

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International Journal of minerals,Metallurgy and Materials 2012年第4期19卷 303-311页

作者： Fu-bin Liu xi-min zang Zhou-hua Jiang xin Geng Man Yao School of Materials and Metallurgy Northeastern University Shenyang 110819 China School of Materials and Metallurgy University of Science and Technology Liaoning Anshang 114051 China School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China

A mathematical model was developed to describe the interaction of multiple physical fields in a slag bath during electroslag remelting （ESR） process with a current-conductive mould. The distributions of current density, magnetic induction intensity, electromagnetic force, Joule heating, fluid flow and temperature were simulated. The model was verified by temperature measurements during remelting 12CrMoVG steel with a slag of 50wt%-70wt% CaF2, 20wt%-30wt% CaO, 10wt%-20wt% A1203, and 〈10wt% SiO2 in a 600 mm diameter current-conductive mould. There is a good agreement between the calculated temperature results and the measured data in the slag bath. The calculated results show that the maximum values of current density, electromagnetic force and Joule heating are in the region between the comer electrodes and the conductivity element. The characteristics of current density distribution, magnetic induction intensity, electromagnetic force, Joule heating, velocity patterns and temperature profiles in the slag bath during ESR process with current-conductive mould were analyzed.

关键词： electroslag remelting mathematical models slag bath temperature distribution

Reaction behavior of MgO refractory with high-Mn and high-Al steel

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Journal of Iron and Steel Research International 2024年第6期31卷 1389-1398页

作者： Ling-zhong Kong Lin Zu Jie Yang xi-min zang xin Yang ming Kang School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina

To understand the mechanism of the interfacial reaction between high-Mn and high-Al steel and MgO refractory,a series of laboratory experiments as well as thermodynamic calculations were *** effects of Mn and Al contents in the steel and the reaction time on the interfacial reaction were *** was observed that the erosion of the MgO refractory is caused by the reaction of Al and Mn in the steel with MgO in the refractory,which would lead to the formation of(Mn,Mg)O·Al_(2)O_(3) spinel and(Mn,Mg)O solid *** formation mechanism of the spinel and solid solution is as *** Al in the steel firstly reacts with MgO in the refractory to generate MgO·Al_(2)O_(3) spinel,and then,the spinel reacts with Mn in the steel to form(Mn,Mg)O·Al_(2)O_(3) ***,the MnO in the spinel reacts with the MgO in the inner refractory to form(Mn,Mg)O solid *** addition,only(Mn,Mg)O·Al_(2)O_(3) spinel is present in the interfacial reaction layer of the refractory when the Al content in the steel is sufficient.

关键词： High-Mn high-Al steel MgO refractory Reaction behavior Spinel

Effect of atmospheric pressure on physical parameters of steels and solidification conditions during PESR process:a review

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Journal of Iron and Steel Research International 2021年第12期28卷 1504-1514页

作者： Yusuf Abba Yusuf Wan-ming Li Shi-shen Li Hua-bing Li xi-min zang School of Materials and Metallurgy University of Science and Technology LiaoningAnshan114051LiaoningChina School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina

The pressurized electroslag remelting(PESR)process has a remarkable impact on manufacturing high nitrogen steels,which can alter the physical parameters of steels and solidification conditions at different atmospheric *** principle and applications of the PESR process are *** effect of atmospheric pressure,including Gibbs free energy,nitrogen solubility,melting point,viscosity,diffusion coefficient,partition coefficient,and nucleation rate,is explicitly expressed by empirical knowledge and quantified by thermodynamic *** variation of interfacial heat transfer coefficient is discussed at different atmospheric ***,the effect of atmospheric pressure on physical parameters of steels and solidification conditions during the PESR process is still in their embryonic research stage and it is important to do further study in this research ***,a general concluding remark and suggestions for future development are proposed.

关键词： Pressure High nitrogen steel Pressurized electroslag remelting Thermodynamic Physical parameter Solidification condition

Determination of real-time oxygen transfer rate based on an electrochemical method

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Journal of Iron and Steel Research International 2022年第3期29卷 418-424页

作者： Shi-sen Li Wan-ming Li De-jun Li Yu-lei Sun Jun-wei Dong xi-tao Yin xi-min zang School of Materials and Metallurgy University of Science and Technology LiaoningAnshan114051LiaoningChina State Key Laboratory of Marine Engineering Anshan114051LiaoningChina Shenyang Huasheng Metallurgy Technology and Equipment Co. Ltd.Shenyang110819LiaoningChina School of Physics and Optoelectronic Engineering Ludong UniversityYantai264000ShandongChina

The interfacial oxygen transfer rate is one of the main factors to control the composition of *** commonly employed method of studying the interfacial oxygen transfer rate is the chemical composition analysis;however,it is difficult to be studied in ***,a new method of measuring the oxygen transfer rate at the gas-slag and slag-metal interfaces was reported based on electrochemical *** interfacial oxygen transfer rate in the smelting process of Inconel 718 superalloy was investigated at 1723,1773,1823,and 1873 *** experimental results show that the electrochemical method can measure the real-time oxygen content;hence,this method is promising in controlling the oxygen content in *** the temperature increased,both the equilibrium oxygen content and the rate of oxygen absorption increased significantly,and the increase was the most obvious when the temperature was 1873 *** possible reason is that the increase in temperature weakens the mass transfer resistance of the electric double layer at the interface,thus accelerating the oxygen transfer rate.

关键词： In situ measurement Charge Electrochemical method Temperature Oxygen transfer rate Equilibrium oxygen content

Electroslag Remelting Withdrawing Technology for Offshore Jack-up Platform Rack Steel Manufacturing Process

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Journal of Iron and Steel Research International 2016年第4期23卷 297-304页

作者： xi-min zang Tian-yu QIU Wan-ming LI xin DENG Zhou-hua JIANG Hua SONG School of Material and Metallurgy University of Science and Technology Liaoning School of Metallurgy Northeastern University School of Mechanical Engineering and Automation University of Science and Technology Liaoning

Offshore jack up platform rack steel must exhibit high strength and toughness as well as excellent welding properties. A high-quality large ingot is a prerequisite for obtaining a high-performance rough part. The electroslag remelting withdrawing （ESRW） technology using a T-shaped mold and bifilar mode was introduced to replace casting technology. Numerical simulation of the ESRW process was performed to determine the distribution of the temperature and velocity fields and to determine the optimum process for producing rack steels. Several A514Q slab ingots with dimensions of 0.32 m×1.40 m × 4.00 m were produced using ESRW technology in an industrial plant. The industrial test indicated that slab ingots produced by the ESRW method exhibited uniform chemical compositions and compact macrostructures. A 115.4 mm thick plate was produced from the rough ingot after 11 roiling passes. Samples were obtained from different positions in the steel plate to test the mechanical performance and examine the microstructure, and the results revealed that the properties of the steel plate satisfied ASTM standards. The ESRW process improved the tensile strength and toughness of the slab ingot, enabling significant improvements in the anisotropy and low temperature toughness, which are critical for the development of rack steel for offshore platforms.

关键词： electroslag remelting withdrawing rack steel mechanical performance low temperature toughness

Two-dimensional comprehensive mathematical model for electroslag remelting process with pipe electrode

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Journal of Iron and Steel Research International 2021年第1期28卷 19-28页

作者： Wen‑jie Tong Wan‑ming Li xi‑min zang Peng Wang Hua‑bing Li De‑jun Li School of Material and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina State Key Laboratory of Marine Engineering Anshan 114051LiaoningChina

Taking the electroslag remelting with pipe electrode(ESR-PE)and electroslag remelting with solid electrode(ESR-SE)as the research objects,a two-dimensional steady-state mathematical model of coupled electromagnetic field equation,energy equation,and flow equation was *** distribution of its current density,Joule heat,flow field,and temperature field was compared and the difference of their molten metal pool was *** results show that compared with those of ESR-SE,current density distribution and Joule heating area of ESR-PE are mainly concentrated in the inner and outer wall areas of the electrode tip,while the Joule heat generated in the central area of the slag pool is *** the ESR-PE,the slag flows from the outside of the electrode to the hollow area of the electrode,which makes the temperature distribution in the slag pool is more *** by the Joule heating area and flow field,the heat of ESR-SE is concentrated below the electrode in the slag pool area and it transfers from the center to the ***,in the ESR-PE,the heat is concentrated near the inner and outer walls of the electrode tip,and the heat is transferred from the periphery to the center of the slag *** molten metal pool depth of ESR-SE is 0.1188 m and that of ESR-PE is 0.0962 *** with that of ESR-SE,the molten metal pool of ESR-PE is shallower and flatter.

关键词： Pipe electrode Solid electrode Electroslag remelting Mathematical model Molten metal pool

Study on primary carbides precipitation in H13 tool steel regarding cooling rate during solidification

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China Foundry 2020年第3期17卷 235-244页

作者： Guang-di Zhao xi-min zang Wan-ming Li Zhuo Zhao De-jun Li School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China State Key Laboratory of Marine Equipment and Applications Anshan114051China

This study aims to investigate the primary carbides precipitation in H13 steel solidified at relatively high cooling rates,ranging from 300 to 6,000℃·min^-1,based on in situ observations with a high temperature confocal laser scanning *** the cooling rate range investigated,the solidification microstructure becomes more refined as cooling rate increases and the relationship between the secondary dendrite arm spacing(SDAS),λ2,and cooling rate,.T,can be expressed asλ2=*** of cooling rates,two kinds of primary carbides,i.e.,the Mo-Cr-rich and V-rich carbides,are precipitated along the interdendritic region and most of them are the Mo-Cr-rich *** morphology of Mo-Cr-rich carbide is not obviously influenced by the cooling rate,but that of V-rich carbide is obviously *** increasing cooling rate markedly refines the primary carbides and reduces their volume fractions,but their precipitations cannot be inhibited even when the cooling rate is increased to 6,000℃·min^-***,the segregation ratios(SRs)of the carbides forming elements are not obviously affected by the cooling ***,compared with the conventionally cast ingot,the SDAS and primary carbides in the steel solidified at the investigated cooling rates are much finer,morphologies of the carbides have changed significantly,and SRs of the carbides forming elements are markedly *** variation of primary carbide characteristics with cooling rate is mainly due to the change in SDAS.

关键词： H13 steel cooling rate solidification primary carbides