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Torsional deformation-induced gradient hierarchical structure in a 304 stainless steel

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Journal of iron and steel Research International 2021年第6期28卷 722-728页

作者： Jia-long Tian Guang Hu Wei Wang Yi-yin Shan Zhou-hua Jiang School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Institute of Metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina Shenyang RongRong Science and Technology co. Ltd.Shenyang 110000LiaoningChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

After applying torsion to cylindrical 304 stainless steel samples,a gradient structure along the radial direction was *** was found that the volume fraction of a0-martensite increased gradually from the center to the surface of *** possibility of deformation-induced martensitic transformation was analyzed theoretically,whose conclusions were consistent with the experimental *** was found that torsional deformation could produce abundant deformation twin and deformation-induced martensite,which could affect the tensile property of steel *** existence of deformation and martensite during torsion could increase the strength but deteriorate the ductility dramatically during the tensile test,which should be attributed to the weakening of work hardening *** a result of severe deformation,both strain-induced and stress-induced martensite have been ***,two types of martensitic transformation mechanisms during torsional deformation were discussed.

关键词： Gradient material Torsional deformation Thermodynamic calculation 304 stainless steel Martensitic transformation

Application of insulation padding in a heavy turbine guide vane casting

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Journal of iron and steel Research International 2017年第5期24卷 495-500页

作者： Jin-wu Kang Qing-xian Ma Chi Zhang Pei-chao Zhou Zhong-ren Liu Zu-liang Li Hao Zhang School of Materials Science and Engineering Key Laboratory for Advanced Materials Processing Technology Tsinghua UniversityBeijing 100084 China Department of Mechanical Engineering Key Laboratory for Advanced Materials Processing Technology Tsinghua University Beijing 100084 China Harbin Electric Machinery co. Ltd. Harbin 150040 Heilongjiang China

To replace metal padding by insulation padding for castings can save the melt and reduce cleaning work of castings. The design of insulation padding was investigated. The equation of the modulus extension factor for insulation padding and the ratio of its thickness over the modulus of a casting were improved to deter- mine the thickness of insulation padding. The insulation padding was designed for a turbine guide vane casting weighing 3.5 t. A sound casting was obtained with 750 kg steel saved. On the other side, the cast- ing obviously expanded at the interface with the insulation padding, which is perhaps the reason that the use of insulation padding has been suspended for many years. To avoid the expansion of insulation pad- ding, a shielding layer made of a kind of material of good fire resistance was adopted to prevent the insula- tion layer from touching the melt. The shielding layer serves as a cushion of heat and expansion during so- lidification process so as to resist the expansion of castings and guarantee the feeding effect at the same time. Furthermore, insulation padding can be placed by a certain offset into the mold cavity so as to coun- teract the expansion of castings.

关键词： Heavy steel casting Insulation padding Metal padding Modulus Expansion Shielding

Simulation study on fluid flow performance of injection stirring composite process in molten iron desulfurization process

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Journal of iron and steel Research International 2023年第12期30卷 2403-2415页

作者： Chao Lv Xu-xin Chen Hai-wei Zhang Hong-liang Zhao Lin-hui Yu Wen-ming Guo School of control Engineering Northeastern University at QinhuangdaoQinhuangdao066000HebeiChina Yingkou Dongbang Environmental Protection Technology co. Ltd.Yingkou115000LiaoningChina School of Metallurgy and Ecological Engineering University of Science and Technology BeijingBeijing100083China XCMG Earthmoving Machinery Division Xuzhou221004JiangsuChina

The blowing and stirring composite process of molten iron desulfurization process affects the desulfurization efficiency and has obvious advantages in improving steel properties and expanding the scale of converter *** present,the injection position of the injection stirring research is fixed,and the desulfurization efficiency needs to be *** gas–liquid flow behavior of single-scale bubble model and the size and distribution of bubbles in multi-scale bubble model were studied by computational fluid dynamics numerical simulation method for the injection mixing composite process of jet inlet and stirring paddle rotating at the same *** pressure distribution and velocity distribution inside the fluid indicate that the velocity difference between the gas–liquid phases and the turbulence of the liquid are due to the collisions of bubbles,which are due to essential conditions for bubble *** injection air volumes have essential influence on the formation of single *** the injection volume reaches 2.8 m3/h,the turbulent kinetic energy is maximum,the bubble formation is rapid,and the desulfurization efficiency can be *** multi-bubble results show that the bubble diameter is mainly distributed in the range of 2–5 *** higher gas flow rate will increase the number of bubbles in the fluid and promote the bubble refinement process.

关键词： Molten iron desulfurization Spraying-Stirring-Bubble Numerical simulation

Model for RuhrstahI-Heraeus （RH） decarburization process

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Journal of iron and steel Research International 2018年第4期25卷 409-416页

作者： Dong-ping Zhan Yang-peng Zhang Zhou-hua Jiang Hui-shu Zhang School of Metallurgy Northeastern University Shenyang 110819 Liaoning China Shenyang Northeastern Institute of Metal Materials co. Ltd. Shenyang 110108 Liaoning China School of Materials Science and Engineering Northeastern University Shenyang 110819 Liaoning China Metallurgical Engineering college Liaoning Institute of Science and Technology Benxi 117004 Liaoning China

A mathematical model was established to predict the carbon content of ultralow carbon steel in the Ruhrstahl-Heraeus （RH） process. The model was solved using the fourth-order Runge-Kutta method and assumed that the volume of steel partaking in the reaction depends on the decarburization mechanism. After analyzing the decarburization process using the proposed model, the following conclusions were drawn. First, the initial carbon and oxygen contents in the RH degasser should be stabilized in the range of （200-350） × 10^-6 and （500-700） × 10^-6, respectively. Second, in the initial stage, the pressure should be reduced as quickly as possible. Third, oxygen blowing should begin as early as possible when the forced decarburization is needed and the minimum oxygen flow rate should be 0.1923 m3/（t rain）. Finally, expanding the diameter of the snorkel tube from 480 to 600 mm clearly enhances the decarburization rate.

关键词： RH Model Carbon content Fourth-order Runge-Kutta Ultralow carbon steel Decarburization

Effect of boron addition on microstructure and mechanical properties of an additively manufactured superalloy

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Journal of iron and steel Research International 2023年第3期30卷 601-609页

作者： Rui Wang Dao-hong Wang Peng Zhang Zhi-qing Yang Jing-jing Liang Jin-guo Li Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026AnhuiChina Jiang Su Feiyue Machine and Pump Group co. Ltd.Jingjiang 225300JiangsuChina

The effect of boron addition(0.010,0.015,and 0.020 wt.%)on the microstructure and mechanical properties of an additively manufactured superalloy was *** as-built microstructure was investigated by scanning electron microscopy and transmission electron *** results demonstrate that boron precipitates as M_(3)B_(2)boride at the grain *** increase in boron content increases the amount ofγ/γ′eutectic and the size and fraction of M_(3)B_(2)*** creates nanoscale fine borides at grain boundaries,which significantly reinforces grain *** mechanical property analysis indicated that the addition of boron improved the tensile ductility at 760℃and stress rupture properties at 760℃/780 ***,with the excessive addition of boron,the mechanical property was reduced.

关键词： Additive manufacturing Superalloy Boron Grain boundary Stress rupture Tension

Characterization of Nanocrystallizatin Surface Layer of 0.4C-1Cr Low Alloy steel Prepared by Ultrasonic Particulate Peening

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材料热处理学报 2004年第5B期25卷 1257-1259页

作者： ZHANGJun-bao LIUYu-liang ZHAOXin-qi WUJie SONGHong-wei XIONGTian-ying BaosteelTechnologyCenter BaoshanIron＆SteelCO.LTD.ShanghaiChina InstituteofMetalResearch ChineseAcademyofSciencesShenyangChina

A nanostructured surface layer was fabricated in a quenched and tempered 0.4C-lCr low alloy steel by ultrasonic particulate peening technique. The microstructure of the nanocrystalline surface layer was characterized by means of TEM and Mossbauer spectroscopy. Experimental results reveal that both cementite and ferrite nanocrystals with an average size of 5 nm were formed in the surface layer of the steel, phase transformation of austenite and dissolution of cementite maybe occur in the process of ultrasonic paniculate peening.

关键词：显微结构超声波喷丸处理表面毫微结晶 0.4C-1Cr低合金钢

Effect of Nb Solute and NbC Precipitates on Dynamic or Static Recrystallization in Nb steels

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Journal of iron and steel Research International 2012年第11期19卷 52-56页

作者： XIAO Fu-ren CAO Ya-bin QIAO Gui-ying ZHANG Xiao-bing LIAO Bo Key Laboratory of Metastable Materials Science and Technology College of Materials Science and EngineeringYanshan UniversityQinhuangdao 066004HebeiChina School of Environmental and Chemical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina Jiangsu Shagang Group co ltd Zhangjiagang215625JiangsuChina

Nb is often considered to be a powerful alloying element for controlling the recrystaUization process in mi- croalloyed high strength steels. However, Nb can be presented either as solute in solution, where it is thought to ex- hibit a strong solute drag effect, or as NbC precipitates, which are thought to be effective at pinning grain bounda- ries. Therefore, it is very important to quantitatively measure Nb in solution or in NbC precipitates. A quantitative analysis method of Nb in solution and in precipitates was proposed. The test procedure involved chemical dissolution, filtration and inductively coupled plasma atomic emission spectroscopic （ICP-AES） analysis. The amount of Nb in solution in Nb-microallyed steels under different treatment conditions was evaluated. The results show that the niobium and carbon contents in steels have a great effect on niobium dissolution kinetics. The solute Nb is more effective to retard dynamic recrystallization, while the NbC precipitates are more effective to inhibit static recrystaltization. The results may help to comprehend effect of Nb in steels, and provide some guides in the design of new high strength Nb-bearing steels.

关键词： Nh microalloyed steel solution precipitation quantitative analysis recrystallization

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

Energy Optimization of iron and steel Enterprises

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Energy Optimization of Iron and Steel Enterprises