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Effect of lamellarization on the microstructure and mechanical properties of marine 10Ni5CrMoV steel

International Journal of Minerals,Metallurgy and Materials 2025年第02期 402-413页

作者： Tao Zou Yanwu Dong Zhouhua Jiang Shuyang Du Yushuo Li School of Metallurgy Northeastern University key laboratory of rolling and automation Northeastern University key laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education) Northeastern University

Multistage heat treatment involving quenching(Q), lamellarizing(L), and tempering(T) is applied to marine 10Ni5CrMoV steel. The microstructure and mechanical properties were studied by multiscale characterizations, and the kinetics of reverse austenite transformation, strain hardening behavior, and toughening mechanism were further investigated. The lamellarized specimens possess low yield strength but high toughness, especially cryogenic toughness. Lamellarization leads to the development of film-like reversed austenite at the martensite block and lath boundaries, refining the martensite structure and lowering the equivalent grain size. Kinetic analysis of austenite reversion based on the JMAK model shows that the isothermal transformation is dominated by the growth of reversed austenite,and the maximum transformation of reversed austenite is reached at the peak temperature(750°C). The strain hardening behavior based on the modified Crussard–Jaoul analysis indicates that the reversed austenite obtained from lamellarization reduces the proportion of martensite, significantly hindering crack propagation via martensitic transformation during the deformation. As a consequence, the QLT specimens exhibit high machinability and low yield strength. Compared with the QT specimen, the ductile–brittle transition temperature of the QLT specimens decreases from-116 to-130°C due to the low equivalent grain size and reversed austenite, which increases the cleavage force required for crack propagation and absorbs the energy of external load, respectively. This work provides an idea to improve the cryogenic toughness of marine 10Ni5CrMoV steel and lays a theoretical foundation for its industrial application and comprehensive performance improvement.

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Numerical analysis of heat transfer intensity from twin slot vertical jet impingement on strip surface after hot rolling

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Journal of Central South university 2015年第7期22卷 2816-2824页

作者：石建辉袁国江连运赵昆王国栋 state key laboratory of rolling and automation.northeastern university)

The flow field and heat transfer of the strip surface due to the twin slot vertical jet impingement were investigated using the ANSYS *** RNG k-ε model was carried out in the turbulent *** parametric research was conducted by varying the jet velocity of nozzle exit(V=5 m/s,7.5 m/s,10 m/s),the temperature of cooling water(T_w=280 K,300 K),the normalized spacing from the nozzle to the strip surface(H=10,15,20,33),and the normalized spacing from the nozzle to nozzle centerline(W=0,15,30).The velocity streamline of the flow domain and the general trend of the distribution of the local Nusselt number on the impingement surface of strip were *** result indicate that,the average Nusselt number increases by about70%(90%) as the jet velocity is increased from 5 m/s to 7.5 m/s(from 7.5 m/s to 10 m/s),and T_w,Hand//have minimal effect on *** the valley Nusselt number decreases by about 10%-43%with the increase of H and *** functional relationship between the average Nusselt number and the systematic parameters is derived by the least square regression method.

关键词： ultra-fast cooling heat transfer flow field twin slot nozzle Nusselt number

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Hard magnetization direction and its relation with magnetic permeability of highly grain-oriented electrical steel

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International Journal of Minerals,Metallurgy and Materials 2014年第11期21卷 1077-1082页

作者： Hao Wang Chang-sheng Li Tao Zhu state key laboratory of rolling and automation Northeastern University

The magnetic properties of highly grain-oriented electrical steel vary along different directions. In order to investigate these properties, standard Epstein samples were cut at different angles to the rolling direction. The hard magnetization direction was found at an angle of 60° to the rolling direction. To compare the measured and fitting curves, when the magnetic field intensity is higher than 7000 A/m, it is appropriate to simulate the relation of magnetic permeability and magnetization angle using the conventional elliptical model. When the magnetic field intensity is less than 3000 A/m, parabolic fitting models should be used; but when the magnetic field intensity is between 3000 and 7000 A/m, hybrid models with high accuracy, as proposed in this paper, should be applied. Piecewise relation models of magnetic permeability and magnetization angle are significant for improving the accuracy of electromagnetic engineering calculations of electrical steel, and these new models could be applied in further industrial applications.

关键词： electrical steel magnetization direction magnetic permeability mathematical models

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Case-Based Reasoning(CBR) Model for Ultra-Fast Cooling in Plate Mill

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Chinese Journal of Mechanical Engineering 2014年第6期27卷 1264-1271页

作者： HU Xiao WANG Zhaodong WANG Guodong state key laboratory of rolling and automation Northeastern University

New generation thermo-mechanical control process（TMCP） based on ultra-fast cooling is being widely adopted in plate mill to product high-performance steel material at low cost. Ultra-fast cooling system is complex because of optimizing the temperature control error generated by heat transfer mathematical model and process parameters. In order to simplify the system and improve the temperature control precision in ultra-fast cooling process, several existing models of case-based reasoning（CBR） model are reviewed. Combining with ultra-fast cooling process, a developed R5 CBR model is proposed, which mainly improves the case representation, similarity relation and retrieval module. Certainty factor is defined in semantics memory unit of plate case which provides not only internal data reliability but also product performance reliability. Similarity relation is improved by defined power index similarity membership function. Retrieval process is simplified and retrieval efficiency is improved apparently by windmill retrieval algorithm. The proposed CBR model is used for predicting the case of cooling strategy and its capability is superior to traditional process model. In order to perform comprehensive investigations on ultra-fast cooling process, different steel plates are considered for the experiment. The validation experiment and industrial production of proposed CBR model are carried out, which demonstrated that finish cooling temperature（FCT） error is controlled within±25℃ and quality rate of product is more than 97%. The proposed CBR model can simplify ultra-fast cooling system and give quality performance for steel product.

关键词： ultra-fast cooling plate mill case-based reasoning case representation similarity relation retrieval module

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Deformation Behavior of Fe-36Ni Steel during Cryogenic( 123-173 K) rolling

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Journal of Iron and Steel Research International 2016年第5期23卷 447-452页

作者： Jian-jun ZHENG Chang-sheng LI Shuai HE Ban CAI Yan-lei SONG state key laboratory of rolling and automation Northeastern University

Microstructural evolution and mechanical properties of cryogenic rolled Fe-36Ni steel were investigated. The annealed Fe-36Ni steel was rolled at cryogenic temperature（ 123-173 K） with 20%- 90% rolling reduction in *** deformation process was accompanied by twinning at cryogenic temperature,and the mean thickness of deformation twins was about 200 nm with 20% rolling reduction. When the rolling reduction was above 40%,twinning was suppressed due to the stress concentration in the tested steel. Deformation microstructure of Fe-36Ni steel consisted of both twin boundaries and dislocations by cryogenic rolling（ CR）,while it only contained dislocations after rolling at room temperature（ RT）. The tensile strength of Fe-36Ni steel was improved to 930 MPa after 90% reduction at cryogenic temperature,while the tensile strength after 90% reduction at RT was only 760 MPa. More dislocations could be produced as the nucleation sites of recrystallization during CR process.

关键词： Fe-36Ni steel cryogenic rolling twinning dislocation slip room temperature deformation microstructure

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Preparation of AZ31 magnesium alloy strips using vertical twin-roll caster

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Transactions of Nonferrous Metals Society of China 2010年第6期20卷 973-979页

作者：王广山邸洪双黄峰 state key laboratory of rolling and automation Northeastern University

A newly developed technology for manufacturing magnesium alloy strip,vertical twin-roll strip casting,has been *** manufacturing process is easy to be facilitated in an economical way to manufacture wrought magnesium alloy strips. As an example,AZ31 magnesium alloy was used to investigate the appropriate manufacturing conditions for vertical twin-roll strip casting by varying the temperatures of the molten materials and rolling *** effects of manufacturing conditions on forming quality were clarified in terms of roll speeds and casting *** addition,microscopic observation and X-ray diffraction of the as-cast strips were *** has been determined that AZ31 alloy strip of 1-3 mm in thickness can be produced at a speed of 30 m/min by a vertical twin-roll *** microstructure of as-cast strip only containsα-phase(Mg)and no other phase,and the twin-roll casting process can effectively refine the grain *** fine equiaxed grain of as-cast strips is beneficial to the plastic deformation of the strips,and it is also suitable for direct cold-rolling with a maximum cold-rolling reduction of 40%.

关键词： AZ31 magnesium alloy vertical twin-roll casting cold rolling microstructure tensile properties

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Microstructure Evolution and Strain-Dependent Constitutive Modeling to Predict the Flow Behavior of 20Cr–24Ni–6Mo Super-Austenitic Stainless Steel During Hot Deformation

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Acta Metallurgica Sinica(English Letters) 2018年第4期31卷 401-414页

作者： Yan-Sen Hao Wan-Chun Liu Zhen-Yu Liu state key laboratory of rolling and automation Northeastern University

Hot compression tests were carried out with specimens of 20Cr-24Ni-6Mo super-austenitic stainless steel at strain rate from 0.01 to 10 s^-1 in the temperature range from 950 to 1150 ℃,and flow behavior was *** analysis indicated that dynamic recrystallization（DRX）behavior was more sensitive to the temperature than strain rate,and full DRX was obtained when the specimen deformed at 1150℃.When the temperature reduced to 1050 ℃,full DRX was completed at the highest strain rate 10 s-l rather than at the lowest strain rate 0.01 s-1 because the adiabatic heating was pronounced at higher strain *** addition,flow behavior reflected in flow curves was inconsistent with the actual microstructural evolution during hot deformation,especially at higher strain rates and lower ***,flow curves were revised in consideration of the effects of adiabatic heating and friction during hot *** results showed that adiabatic heating became greater with the increase of strain level,strain rate and the decrease of temperature,while the frictional effect cannot be neglected at high strain ***,based on the revised flow curves,strain-dependent constitutive modeling was developed and verified by comparing the predicted data with the experimental data and the modified *** result suggested that the developed constitutive modeling can more adequately predict the flow behavior reflected by corrected flow curves than that reflected by experimental flow curves,even though some difference existed at 950℃ and 0.01 s^-*** main reason was that plenty of precipitates generated at this deformation condition and affected the DRX behavior and deformation behavior,eventually resulted in dramatic increase of deformation resistance.

关键词： Super-austenitic stainless steel Hot compression Adiabatic heating Constitutive modeling Microstructure evolution

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Control of Surface Thermal Scratch of Strip in Tandem Cold rolling

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Chinese Journal of Mechanical Engineering 2014年第4期27卷 738-744页

作者： CHEN Jinshan LI Changsheng state key laboratory of rolling and automation Northeastern University

The thermal scratch seriously affects the surface quality of the cold rolled stainless steel strip. Some researchers have carried out qualitative and theoretical studies in this field. However, there is currently a lack of research on effective forecast and control of thermal scratch defects in practical production, especially in tandem cold rolling. In order to establish precise mathematical model of oil film thickness in deformation zone, the lubrication in cold rolling process of SUS410L stainless steel strip is studied, and major factors affecting oil film thickness are also analyzed. According to the principle of statistics, mathematical model of critical oil film thickness in deformation zone for thermal scratch is built, with fitting and regression analytical method, and then based on temperature comparison method, the criterion for deciding thermal scratch defects is put forward. Storing and calling data through SQL Server 2010, a software on thermal scratch defects control is developed through Microsoft Visual Studio 2008 by MFC technique for stainless steel in tandem cold rolling, and then it is put into practical production. Statistics indicate that the hit rate of thermal scratch is as high as 92.38%, and the occurrence rate of thermal scratch is decreased by 89.13%. Owing to the application of the software, the rolling speed is increased by approximately 9.3%. The software developed provides an effective solution to the problem of thermal scratch defects in tandem cold rolling, and helps to promote products surface quality of stainless steel strips in practical production.

关键词： thermal scratch mathematical model software design tandem cold rolling stainless steel

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Texture evolution and mechanical properties of Al-Mg-Si alloys at different intermediate annealing temperatures

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Rare Metals 2019年第10期38卷 937-945页

作者： Yong Li Qi-Pan Wang Guan-Jun Gao Jia-Dong Li Zhao-Dong Wang Guang-Ming Xu state key laboratory of rolling and automation Northeastern University

Intermediate annealing treatment produces different effects on the state of particles in Al-Mg-Si alloy sheets,thereby affecting their recrystallization textures and *** improve the formability of the sheets,the effects of different intermediate annealing temperatures on the texture evolution and mechanical properties of these sheets for automotive applications were studied using optical microscope(OM),scanning electron microscope(SEM) and tensile *** results reveal that intermediate annealing temperature has a significant influence on the recrystallization textures and average plastic strain ratio(r).After solution treatment,all the alloy sheets possess similar recrystallization texture components comprising of cubeND {100} and P {011} orientations,whereas a characteristic strong cube-oriented {100} texture is observed only in the alloy annealed at a temperature of 380℃.However,in comparison with the alloy not annealed,and the alloy annealed at 550℃,the alloy annealed at 380℃ possesses a lower average r ***,the relationship between textures and r value was analyzed by using the Taylor full constraints model in this study.

关键词： Al-Mg-Si alloys Intermediate annealing Texture evolution Mechanical property

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Microstructural Evolution and Toughness in the HAZ of Submerged Arc Welded Low Welding Crack Susceptibility Steel

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Acta Metallurgica Sinica(English Letters) 2013年第1期26卷 49-55页

作者： Chunlin QIU Liangyun LAN Dewen ZHAO Xiuhua GAO Linxiu DU state key laboratory of rolling and automation Northeastern University

Microstructural characteristics of different sub-regions of heat affected zone （HAZ） of low welding crack susceptibility steel weldment were investigated by using optical microscopy and scanning electron microscopy equipped with electron backscattered diffraction system. And the focus was put on the correlation between microstructural characteristics and HAZ toughness of the weldment. The results reveal that the toughness of fusion line zone （FLZ） specimens is much lower than that of fine grained HAZ （FGHAZ） specimens. The coarse inclusions in the weld metal and the large martensite-austenite constituents in the coarse grained HAZ （CGHAZ） have an obvious negative effect on the crack initiation energy of FLZ. Meanwhile, the coarse granular bainite with large effective grain decreases the crack propagation energy seriously. By contrast, fine crystallographic grains in the FGHAZ play a key role in increasing toughness, especially in improving crack propagation energy.

关键词： Steel Heat affected zone (HAZ) Submerged arc welding Effective grain size Toughness Microstructure

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