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The combined influence of grain size distribution and dislocation density on hardness of interstitial free steel

Journal of Materials Science & Technology 2020年第10期42卷 35-43页

作者： Wei Li Martina Vittorietti Geurt Jongbloed jilt sietsma Department of Materials Science and Engineering Delft University of TechnologyMekelweg 22628 CDDelftthe Netherlands Department of Applied Mathematics Delft University of TechnologyVan Mourik Broekmanweg 62628 XEDelftthe Netherlands Materials Innovation Institute(M2i) Van der Burghweg 1.2628 CSDelftthe Netherlands

Understanding the relationship between microstructure features and mechanical properties is of great significance for the improvement and specific adjustment of steel *** relationship between mean grain size and yield strength is established by the well-known Hall-Petch *** due to the complexity of the grain configuration within materials,considering only the mean value is unlikely to give a complete representation of the mechanical *** classical Taylor equation is often used to account for the effect of dislocation density,but not thoroughly tested in combination with grain size *** the present study,systematic heat treatment routes and cold rolling followed by annealing are designed for interstitial free(IF)steel to achieve ferritic microstructures that not only vary in mean grain size,but also in grain size distribution and in dislocation density,a combination that is rarely studied in the *** microscopy is applied to determine the grain size *** dislocation density is determined through XRD *** hardness is analyzed on its relation with the mean grain size,as well as with the grain size distribution and the dislocation *** the help of the variable selection tool LASSO,it is shown that dislocation density,mean grain size and kurtosis of grain size distribution are the three features which most strongly affect hardness of IF steel.

关键词： Interstitial free steel Hardness Grain size distribution Dislocation density

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Physical Simulation of Thermally Induced Martensite Formation from Retained Austenite in TRIP Steels

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Journal of Materials Science & Technology 2003年第Z1期19卷 105-108页

作者： Lie ZHAO Fred J. VERMOLEN jilt sietsma Sybrand van der ZWAAG Netherlands Institute for Metals Research P.O.Box 5008 2600 GA Delft The Netherlands Department of Materials Science Delft University of Technology R otterdamseweg 137 2628 AL Delft The Netherlands Department of Applied Mathematics Delft University of Technology Mekelweg 4 2628 CD Delft The Netherlands Department of Materials ScienceDelft University of TechnologyRotterdamseweg 1372628 AL DelftThe Netherlands Netherlands Institute for Metals Research P.O.Box 5008 2600 GA Delft The Netherlands Faculty of Aerospace Engineering Delft University of Technology Kluyverweg 1 2629 HS Delft The Netherlands

The present work analyses the total free energy of the material during the martensitic transformation. A general expression for the martensite fraction as a function of temperature is derived, assuming that the nonchemical free energyis proportional to the volume of martensite. This expression indicates that the temperature-dependent martensitefraction can be predicted once the characteristic transformation temperatures and the relation between the chemicalfree energy and temperature of the martensite and austenite are known. An advantage of this development is thatthe proposed equation is valid for all types of relations between the chemical free energy and temperature. Thissimulation is successfully applied to the martensitic transformation upon further cooling of retained austenite in alow-alloyed TRIP steel, in which the relation between chemical free energy and temperature is quadratic and thefraction is determined from a thermo-magnetic measurement.

关键词： Thermodynamics, Martensitic transformation, Retained austenite, TRIP steels.

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Electrochemistry during efficient copper recovery from complex electronic waste using ammonia based solutions

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Frontiers of Chemical Science and Engineering 2017年第3期11卷 308-316页

作者： Zhi Sun Hongbin Cao Prakash Venkatesan Wei Jin Yanping Xiao jilt sietsma Yongxiang Yang 1 Department of Materials Science and Engineering TU Delft 2628 CD Delft the Netherlands National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China Ironmaking Department R&D Tata Steel 1970 CA IJmuiden the Netherlands

Leaching selectivity during metal recovery from complex electronic waste using a hydrochemical process is always one of the generic issues. It was recently improved by using ammonia-based leaching process, specifically for electronic waste enriched with copper. This research proposes electrodeposition as the subsequent approach to effectively recover copper from the solutions after selective leaching of the electronic waste and focuses on recognising the electrochemical features of copper recovery. The electrochemical reactions were investigated by considering the effects of copper concentration, scan rate and ammonium salts. The diffusion coefficient, charge transfer coefficient and heterogeneous reaction constant of the electrodeposition process were evaluated in accordance with different solution conditions. The results have shown that electrochemical recovery of copper from ammonia- based solution under the conditions of selective electronic waste treatment is charge transfer controlled and provide bases to correlate the kinetic parameters with further optimisation of the selective recovery of metals from electronic waste.

关键词： copper recovery electronic waste end-of-life products selective leaching electrodeposition

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Prediction of density and volume variation of hematite ore particles during in-flight melting and reduction

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Journal of Iron and Steel Research(International) 2019年第12期26卷 1285-1294页

作者： Zhi-yuan Chen Ying-xia Qu Christiaan Zeilstra Jan Van Der Stel jilt sietsma Yong-xiang Yang Department of Materials Science and Engineering Delft University of TechnologyDelft 2628 CDThe Netherlands School of Metallurgical Engineering Northeastern UniversityShenyang 110819LiaoningChina Tata Steel Europe Ijmuiden 1970 CAThe Netherlands

HIsarna is a promising ironmaking technology to reduce CO2 *** of phase transformation is essential for reaction analysis of the cyclone reactor of the HIsarna *** addition,data of density and volume of the ore particles are necessary for estimation of the residence time of the particles in the cyclone *** transformation of iron ore particles was experimentally studied in a drop-tube furnace under simulated cyclone conditions and compared with thermodynamic *** the pre-reduction process inside the reactor,the mineralogy of iron ore particles transforms sequentially from hematite to *** density changes of the particles during the melting and reduction can be predicted based on the phase composition and ***,density models in the studies were evaluated with reported experimental data of *** a result,a more reliable density model was developed to calculate the density of the formed slag containing mainly FeO–*** density and volume of the partially reduced ore particles or melt droplets were estimated based on this *** results show that the density of the ore particles decreases by 15.1%at most along the progressive reduction ***,the model results also indicate that heating,melting and reduction of the ore could lead to 6.63%–9.37%swelling of the particles,which is mostly contributed by thermal *** would result in corresponding variation in velocity of the ore particles or melt droplets during the flight inside the reactor.

关键词： Ironmaking process HIsarna Smelting reduction Ore density change Phase transformation Hematite ore particle

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Recovery and Recrystallisation of C-Mn Steels in the Intercritical Region

Recovery and Recrystallisation of C-Mn Steels in the Intercr...

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The Fourth International Conference on Physical and Numerical Simulation of Materials Processing (ICPNS’2004)

作者： Dave Hanlon jilt sietsma Sybrand van der Zwaag Netherlands Institute for Metals Research 2628AL Delft the Netherlands Laboratory for Materials Science Delft University of Technology 2628 AL Delft the Netherlands Faculty of Aerospace Engineering Delft University of Technology 2629 HS Delft the Netherlands

Recovery and recrystallisation after intercritical deformation in a 0.19%C-1.46%Mn steel were studied using stress relaxation, micro-indentation and Electron Backscatter Diffraction techniques. At temperatures in the range 750-800℃, ferrite grains dynamically recover during the intercritical deformation, whilst austenite grains recrystallise statically after deformation. As the temperature decreases to 700℃, austenitic and ferritic recovery are both observed to start after deformation, but the former finishes in a few minutes whilst the latter lasts for a much longer time. When the temperature further decreases to 675℃, the overall softening of the material resulted primarily from recovery in ferrite.

关键词： Recovery Recrystallisation Intercritical deformation C-Mn steel

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硅锰及加热速率对铁素体再结晶动力学的影响

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水钢科技 2020年第3期 57-73页

作者： Vitesh SHAH Monika KRUGLA Sven Erik OFFERMAN jilt sietsma David Neal HANLON 高长益(译) 叶雅妮(译) 张东升(译) 谢祥(译) 刘立德(译) 吴学林(译) 荷兰代尔夫特理工大学荷兰塔塔钢铁研发中心首钢水钢制造管理部贵州六盘水553028

本研究通过使用7种不同硅、锰含量的钢种,揭示了硅、锰成分和加热速率对铁素体再结晶动力学的影响,这与现代高强度钢渊AHSS冤的开发密切相关.通过原位二维X射线衍射渊2DXRD冤和非原位扫描电镜渊SEM冤微观组织观察,研究了再结晶动力学.... 详细信息

本研究通过使用7种不同硅、锰含量的钢种,揭示了硅、锰成分和加热速率对铁素体再结晶动力学的影响,这与现代高强度钢渊AHSS冤的开发密切相关.通过原位二维X射线衍射渊2DXRD冤和非原位扫描电镜渊SEM冤微观组织观察,研究了再结晶动力学.实验观察到的再结晶起始温度渊Ts冤的差异与Si、Mn含量和加热速率有关,可用非等温JMAK模型和改进的Cahn溶质拖曳模型来描述.改进的Cahn模型近似地考虑了溶质原子与晶界之间的相互作用能,这种作用能依赖于晶界上的Si、Mn含量和Wagner相互作用参数.相对于参照钢种渊没有Si和只有少量Mn的钢种冤,Si、Mn原子对提高Ts的协同贡献高于Si、Mn浓度影响的简单叠加.这意味着,Si、Mn原子的相互作用,导致了Ts的额外上升,即耦合溶质拖曳效应.在再结晶的后期,我们用扫描电镜渊SEM冤研究了再结晶晶粒的数量密度变化和生长速率.观察揭示了再结晶晶粒的非随机形核、法线方向的晶粒早期撞击和非恒定生长速率.

关键词：铁素体再结晶再结晶起始温度耦合溶质拖曳锰硅

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