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solute drag-controlled grain growth in magnesium investigated by quasi in-situ orientation mapping and level-set simulations

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Journal of Magnesium and Alloys 2023年第7期11卷 2312-2325页

作者： Risheng Pei Yujun Zhao Muhammad Zubair Sangbong Yi Talal Al-Samman Institut für Metallkunde und Materialphysik RWTH Aachen University52056 AachenGermany Institute of Materials and Process Design Helmholtz-Zentrum Hereon21502 GeesthachtGermany Department of Metallurgical and Materials Engineering Faculty of ChemicalMetallurgical&Polymer EngineeringUniversity of Engineering&Technology(UET)LahorePakistan Institute for Materials Ruhr-Universität Bochum44801 BochumGermany

Critical properties of metallic materials,such as the yield stress,corrosion resistance and ductility depend on the microstructure and its grain size and size *** atoms that favorably segregate to grain boundaries produce a pinning atmosphere that exerts a drag pressure on the boundary motion,which strongly affects the grain growth behavior during *** the current work,the characteristics of grain growth in an annealed Mg-1 wt.%Mn-1 wt.%Nd magnesium alloy were investigated by advanced experimental and modeling *** quasi in-situ orientation mappings with a scanning electron microscope were performed to track the evolution of local and global microstructural characteristics as a function of annealing *** segregation at targeted grain boundaries was measured using three-dimensional atom probe ***-set computer simulations were carried with different setups of driving forces to explore their contribution to the microstructure development with and without solute *** results showed that the favorable growth advantage for some grains leading to a transient stage of abnormal grain growth is controlled by several drivers with varying importance at different stages of *** longer annealing times,residual dislocation density gradients between large and smaller grains are no longer important,which leads to microstructure stability due to predominant solute *** fluctuations in residual dislocation energy and solute concentration near grain boundaries cause different boundary segments to migrate at different rates,which affects the average growth rate of large grains and their evolved shape.

关键词： Magnesium alloys Grain growth Quasi in-situ EBSD Level-set simulation solute drag Dislocation density gradient

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solute trapping model based on solute drag treatment

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Transactions of Nonferrous Metals Society of China 2010年第5期20卷 877-881页

作者：王海丰刘峰陈正杨伟 State Key Laboratory of Solidification Processing Northwestern Polytechnical University

A solute trapping model is developed based on a so-called solute drag *** adopting a basic approach of phase-field models,and defining the free energy density in the interfacial region,a suitable interface shape function is introduced to derive the current model,in which the equilibrium and non-equilibrium interface behaviours can be described using a dimensionless parameter L (*** important parameter in the present interface shape function).When applying the current model to Si-9%As (molar fraction) alloy with L=0.5,a good prediction of the steeper profile for high interface velocity,which is analogous to that using a phase-field model of DANILOV and NESLTER,has been obtained.

关键词： solute trapping solute drag diffusive interface

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Effect of solute drag and Precipitate Pinning on Austenite Grain Growth in Ti-Nb Microalloyed Steels

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Journal of Iron and Steel Research International 2011年第S1期18卷 383-387页

作者： FU Li-ming 1,WANG Huan-rong 2,WANG Wei 2,SHAN Ai-dang 1 (1.School of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200240,China 2.Department of Structural Steels,Baosteel Research Institute,Shanghai 201900,China) Shanghai Jiao Tong Univ Sch Mat Sci & Engn Shanghai 200240 Peoples R China Baosteel Res Inst Dept Struct Steels Shanghai 201900 Peoples R China

A metallurgical model concerning the co-effect of the Nb solute drag and the complex carbonitride precipitates pinning is proposed to predict the recrystallization austenite grain growth of low carbon Nb-containing microalloyed *** analysis,both predicted and experimental,reveals the precipitate pinning plays a dominate role in suppressing the austenite grain growth with less Nb solute drag effect in high temperature region whereas the Nb solute drag predominates in relatively low temperature region.A factor p is suggested to assess the effectiveness of drag and *** pinning and the drag are more effective in restraining grain growth as p>0 and p<0,respectively.A low carbon Nb microalloyed steel and a kind of Ti-modified low carbon Nb steel by Ti substituting for part of Nb are employed to validate the modeling *** theoretical calculations show a good agreement with experimental results.

关键词： grain growth precipitates pinning solute drag Ti-Nb microalloyed steels

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A solute Pinning Approach to solute drag in Multi-Component Solid Solution Alloys

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Modeling and Numerical Simulation of Material Science 2014年第1期4卷 8-13页

作者： Emmanuel Hersent Knut Marthinsen Erik Nes Granges Technology FinspangSweden Department of Materials Science and Technology Norwegian University of Science and Technology(NTNU)TrondheimNorway

The Cahn, Lücke and Stüwe theory remains the backbone of more complex analysis dealing with solute drag, however, the mathematical treatment is rather involved. A new approach based on solute pinning the boundary has therefore recently been suggested, which has the main advantage of a simpler mathematical treatment. In the present paper this approach has been generalized to take into account the influence of different types of solute atoms in the high solute content/low driving force regime.

关键词： Boundary Mobility solute drag Multi-Component Alloys Analytical Modelling

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Effect of solute drag and Precipitate Pinning on Austenite Grain Growth in Ti-Nb Microalloyed Steels

Effect of Solute Drag and Precipitate Pinning on Austenite G...

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第六届国际低合金高强度钢会议

作者： FU Li-ming~1,WANG Huan-rong~2,WANG Wei~2,SHAN Ai-dang~1 (1.School of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200240,China 2.Department of Structural Steels,Baosteel Research Institute,Shanghai 201900,China)

＜正＞A metallurgical model concerning the co-effect of the Nb solute drag and the complex carbonitride precipitates pinning is proposed to predict the recrystallization austenite grain growth of low carbon Nb-containing microalloyed steels. The analysis,both predicted and experimental,reveals the precipitate pinning plays a dominate role in suppressing the austenite grain growth with less Nb solute drag effect in high temperature region whereas the Nb solute drag predominates in relatively low temperature region.A factor p is suggested to assess the effectiveness of drag and *** pinning and the drag are more effective in restraining grain growth as p＞0 and p＜0,respectively.A low carbon Nb microalloyed steel and a kind of Ti-modified low carbon Nb steel by Ti substituting for part of Nb are employed to validate the modeling *** theoretical calculations show a good agreement with experimental results.

关键词： grain growth precipitates pinning solute drag Ti-Nb microalloyed steels

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Microstructures in a carburized steel after isothermal pearlitic treatment

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Journal of Materials Science & Technology 2023年第29期160卷 66-75页

作者： J.Abraham Mathews H.Farahani J.Sietsma R.H.Petrov M.G.Mecozzi M.J.Santofimia Department of Materials Science and Engineering Delft University of TechnologyMekelweg 22628 CDDelftThe Netherlands Tata Steel Research&Development IJmuidenThe Netherlands Department of Electromechanical Systems and Metal EngineeringGhent UniversityTech Lane Ghent Science park-Campus A ZwijnaardeTechnologiepark 46Belgium

The influence of carbon concentration variations on pearlite formation(20 h at 600℃)in a case-carburized steel is *** resultant microstructure shows three distinct regions:carburized case,a transition region,and the original *** microstructural transition from the case to the core regions is observed to be relatively *** investigated region of the carburized case(0.9 wt.%C)con-tains two types of pearlite:ferrite+cementite and ferrite+M_(23)C_(6),where the pearlitic aggregate with M_(23)C_(6)shows faster formation *** kinetics of pearlite formation in the transition region(0.3 wt.%C)is very slow and is observed with only M_(23)C_(6)*** around 40%austenite decomposes into pearlite in the transition region,which,in comparison to the carburized case region of 0.9 wt.%C is a fraction that is lower by a factor of *** is absent in the investigated core region(0.16 wt.%C).The microstructure in this region is predominantly martensite and pro-eutectoid ferrite,with a fraction of ferrite well below the equilibrium *** formation in this region is limited by the redistribution of mainly Ni,Mn,and Cr,and their resulting solute drag effect on the austenite/ferrite interface.A ther-modynamic and kinetic argumentation of these observations is provided with the help of thermodynamic data,precipitation simulations,and a general mixed-mode Gibbs energy balance model.

关键词： Pearlite formation Carburized steel M 2_(3)C_(6)carbide Kinetics solute drag

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Mechanisms and anisotropy of serrated flow in Mg-Gd single crystals

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Journal of Magnesium and Alloys 2023年第5期11卷 1643-1655页

作者： Henry Ovri Helmholtz Zentrum Hereon Institute of Materials Mechanics21502 GeesthachtGermany

Serrated flow has been primarily studied at the macron scale,yet the length and times scales at which the solute-meditated dislocation pinning and de-pinning processes that underlie the phenomenon occur are largely inaccessible by macroscopic ***,direct insights into the dominant slip systems in the serrated flow regime,which is particularly critical in Mg alloys given their high plastic anisotropy,requires the use of small-scale testing methods such as ***,in this work,a combination of microcompression and TEM based EDS/STEM measurements have used to critically study the temperature and strain rate dependences in single crystals of pure Mg and a Mg-Gd alloy oriented for twinning,basal-,prismatic-,and *** results provide compelling evidence that the solute drag mechanism underlie serrated flow in the alloy;they also show that serrated flow in Mg alloys is markedly *** anisotropy is caused by differences between the Burgers vector for slip/twinning,and between the impurity diffusivity along/perpendicular to the basal plane.

关键词： Microcompression Mg-RE Mg-Gd Pure Mg Serrated flow solute drag STEM

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Isothermal Grain Growth of Austenite in Hypoeutectoid and Hypereutectoid Plain Carbon Steels

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Journal of Iron and Steel Research International 2010年第7期17卷 38-43页

作者： Joydeep Maity Dipak Kumar Mondal Department of Metallurgical and Materials Engineering National Institute of Technology Durgapur

Grain growth kinetics of austenite in a hypoeutectoid steel（containing carbon of 0.35%）at 920 ℃ and in a hypereutectoid steel（containing carbon of 1%）at 980 ℃ for holding time ranging from 1 h to 6 h was *** hypoeutectoid steel exhibited normal grain growth without solute drag hindrance with a time exponent（0.51）close to the theoretical value（0.5）.However,the grain growth of austenite in the hypereutectoid steel held up to 3 h was extremely slow,characterizing by a low value of time exponent（0.08）.Thereafter,a breakaway occurred and the grain growth in the hypereutectoid steel held from 3 h to 6 h progressed normally with a time exponent（0.52）close to the theoretical value（0.5）.

关键词： plain carbon steel grain growth time exponent solute drag

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KINETICS OF AUSTENITIC ISOTHERMAL DECOMPOSITION AND Mn PARTITION IN Fe-C-Mn-B ALLOYS

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Acta Metallurgica Sinica(English Letters) 1992年第4期5卷 240-244页

作者： YANG Liu Southwestern Jiaotong University,Chengdu,ChinaFANG Hongsheng Tsinghua University,Beijing,ChinaMENG Zhihe Luoyang Institute of Technology,China Southwestern Jiaotong Univ Chengdu China

A proper addition of Mn to Fe-C alloys could delay the isothermal transformation and change remarkably the TTT-curves to bay-like *** concentration of Mn at the α/γ interphase boundary and thir partition between α- and γ- phase were measured by STEM/*** results show that the partition of Mn diminishes gradually as the reaction temperature *** exists a certain temperature range with the strong- est Mn concentration spike at the interphase although no Mn partition is found between austenite and ferrite,and this temperature range is correspondent with the bay-temperature on TTT curves of the *** is thus suggests that the change of TTT-curve configuration is due to the partition of alloy *** bay-like shape is attributed to the solute drag ef- fect and the solute drag-like effect caused by the enrichment of Mn at the α/γ interphase.

关键词： TTT curve partition Mn Fe-C-Mn-B alloy solute drag

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Growth Kinetics of Proeutectoid Ferrite in an Fe-0.09C-1.5Mn-0.2Si Steel

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Journal of Iron and Steel Research International 2014年第10期21卷 964-968页

作者： Lin CHENG Kai-ming WU Xiang-liang WAN Guo-hong ZHANG The State Key Laboratory of Refractories and Metallurgy Hubei Collaborative Innovation Center for Advanced SteelsInternational Research Institute for Steel TechnologyWuhan University of Science and Technology

Growth kinetics of proeutectoid ferrite, including grain boundary face nucleated ferrite, grain boundary edge nucleated ferrite allotriomorph and intragranular ferrite idiomorph, were experimentally measured in an Fe- 0.09C-1.5Mn-0.2Si steel and compared with theoretical calculation in local equilibrium and paraequilibrium modes. Grain boundary edge nucleated ferrite exhibited larger growth rate than grain boundary face nucleated ferrite and in- tragranular ferrite idiomorph. Experimental kinetics of proeutectoid ferrite was within the window defined by the lo- cal equilibrium and paraequilibrium limits. A transition of growth kinetics from paraequilibrium to local equilibrium was observed in the temperature range of 650--750 ℃, which can be explained in terms of solute drag.

关键词： steel proeutectoid ferrite kinetics solute drag

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