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Microstructure and mechanical properties of hot-rolled low-carbon steel containing Ti–Ca oxide particles: a comparison between base metal and HAZ

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Journal of Iron and Steel Research International 2020年第4期27卷 440-450页

作者： Chao wang Xin wang Jian Kang guo Yuan guo-dong wang The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

The effect of inclusion-induced nucleation on hot-rolled steel base metal was evaluated in comparison with welding heataffected zone(HAZ).Microstructure and mechanical properties of hot-rolled low-carbon steel containing Ti–Ca oxide particles were *** results showed that inclusions in Ti–Ca deoxidized steel distributed dispersely and were effective for intragranular acicular ferrite *** hot rolling and controlled cooling conditions,microstructure in steel base metal was significantly refined and mainly consisted of acicular ferrite and intragranular bainite,which exhibited higher strength and excellent *** microstructural evolution behavior followed the process that acicular ferrite plates divided the austenite grain,intragranular bainite packets formed between interlocking acicular ferrite plates,and the remaining austenite decomposed into fine polygonal ferrite *** resultant complex microstructure improved the impact toughness *** comparison,in HAZ microstructure,laminar grain boundary ferrite having similar crystallography orientation showed adverse effect on toughness.

关键词： Low-carbon steel Ti–Ca oxide Hot rolling Mechanical property Acicular ferrite Heat-affected zone

Effects of Cooling Paths on Through-Thickness Microstructure and Mechanical Properties of Heavy Gauge X80 Pipeline Steel

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Acta Metallurgica Sinica(English Letters) 2017年第5期30卷 483-492页

作者： Xu-dong Li Cheng-Ning Li guo Yuan guo-dong wang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

The effects of various cooling paths on uniformity of through-thickness microstructure and mechanical properties of X80 pipeline steel of 22.0 mm in thickness were studied. The finite difference method was employed to calculate the temperature field during cooling. It was confirmed by the experimental result and temperature field calculation that the optimizing process was achieved by the ultra-fast cooling with medium cooling capacity（cooling rate of ＊23 K/s）followed by ultimate cooling capacity（cooling rate of ＊50 K/s）. After optimization, the experimental steel displayed much uniform microstructure and the deviation of through-thickness hardness was controlled within 20 HV. In addition,the yield strength, tensile strength and elongation of the experimental steel were 621, 728 MPa and 21.5%, respectively,meeting the requirements of the API standard for X80 pipeline steels.

关键词： X80 pipeline steel Ultra-fast cooling Cooling path Finite difference method Microstructure Mechanical properties

Heat transfer characteristics for double-jet in different flow regions on a thick plate

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Journal of Iron and Steel Research International 2021年第11期28卷 1400-1407页

作者： Xiu-hua Tian Tian-liang Fu Zhao-dong wang guo-dong wang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

During multi-jet cooling,the complex hydrodynamic characteristics caused by the interaction between jets will affect the heat transfer of the *** further clarify the heat transfer characteristics in different flow regions,the double-jet cooling experiments were completed on a 50-mm-thick plate with the initial cooling temperature and jet angle in the range of 300–900°C and 0°–60°,*** inverse heat conduction was used to calculate the surface temperature and heat ***,the rewetting phenomenon,maximum heat flux and maximum cooling speed were *** results show that increasing the angle between jet and wall normal would increase the wetting front’s width downstream of the jet *** the jet angle was 60°,the maximum value increased by 37.29 mm compared with that when the angle was *** correlation between the width of the wetting front and the radial temperature gradient was further *** addition,it was found that the maximum heat flux would be affected by the duration of transition boiling,but not affected by complete wetting *** results clarified the heat transfer mechanisms under various initial cooling temperature and inclination angle conditions on plate cooling in different flow regions,and provided valuable data for controlling heat transfer efficiency and improving cooling uniformity.

关键词： Double-jet Thick plate Rewetting phenomenon Flow region Heat flux

An On-line Finite Element Temperature Field Model for Plate Ultra Fast Cooling Process

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Journal of Iron and Steel Research International 2014年第5期21卷 481-487页

作者： Xiao-lin CHEN guo-dong wang Yong TIAN Bing-xing wang guo YUAN Zhao-dong wang State Key Laboratory of Rolling and Automation Northeastern University

Taking the element specific-heat interpolation function into account, a one-dimensional （l-D） finite ele- ment temperature field model for the on-line control of the ultra fast cooling process was developed based on the heat transfer theory. This 1-D model was successfully implemented in one 4 300 mm plate production line. To improve the calculation accuracy of this model, the temperature-dependent material properties inside an element were considered during the modeling process. Furthermore, in order to satisfy the real-time requirements of the on-line model, the variable bandwidth storage method and the Cholesky decomposition method were used in the programming to storage the data and carry out the numerical solution. The on-line application of the proposed model indicated that the devia- tion between the calculated cooling stop temperature and the measured one was less than ± 15 ℃.

关键词： laminar cooling ultra fast cooling temperature field finite element variable bandwidth storage meth-od Cholesky decomposition method

Effect of deformation parameters in unrecrystallization range on microstructural characteristics in Al-bearing hot-rolled TRIP steel

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Journal of Iron and Steel Research International 2019年第12期26卷 1329-1339页

作者： Xiao-hui wang Jian Kang Yun-jie Li guo Yuan RDKMisra guo-dong wang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX 79968USA

The scanning electron microscope,transmission electron microscope,optical microscope,X-ray diffraction and hardness tests were used to investigate the effect of deformation parameters in unrecrystallization range on microstructural characteristics in Al-bearing hot-rolled transformation-induced plasticity *** thermomechanical-controlled processing was carried out with thermomechanical simulation machine,and the samples were compressed to compression strains of 0,0.15,0.25 and 0.35 at compression temperatures of 850,900 and 950°*** results showed that the volume fraction of polygonal ferrite increased with the increasing compression strain,while the volume fraction of retained austenite reached the maximum value at compression strain of *** volume fraction of polygonal ferrite decreased with the increasing compression temperature,whereas the volume fraction of retained austenite possessed the maximum value at compression temperature of 850°*** granular retained austenite was present in uncompressed samples,and some pearlite appeared at large compression strain,while the hardness of the samples exhibited the similar variation tendency to the volume fraction of retained austenite.

关键词： Hot-rolled TRIP steel Deformation parameter Compression strain Compression temperature Microstructural characteristic

Microstructure and Abrasive Wear Behavior of Medium Carbon Low Alloy Martensitic Abrasion Resistant Steel

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Journal of Iron and Steel Research International 2014年第1期21卷 98-103页

作者： Xiang-tao DENG Zhao-dong wang Yi HAN Hui ZHAO guo-dong wang State Key Laboratory of Rolling and Automation Northeastern University Yangxi Harbor Electric Power Development Co. Ltd.

The effect of processing parameters such as hot rolling and heat treatment on microstructure and mechanical properties was investigated for a new 0.27mass% C and Ni, Mo-free low alloy martensitic abrasion resistant steel. The three-body impact abrasive wear behavior was also analyzed. The results showed that two-step controlled rolling besides quenching at 880 ℃ and tempering at 170 ℃ could result in optimal mechanical property., the Brinell hardness, tensile strength, elongation and --40 ℃ impact toughness were 531, 1530 MPa, 11.8% and 58 J, re- spectively. The microstructure was of fine lath martensite with little retained austenite. Three-body impact abrasive wear results showed that wear mechanism was mainly of plastic deformation fatigue when the impact energy was 2 J, and the relative wear resistance was 1.04 times higher than that of the same grade compared steel under the same working condition. The optimal hardness and toughness match was the main reason of higher wear resistance.

关键词： abrasion resistant steel processing parameter mechanical property relative wear resistance

Convergent adaptive evolution——how common, or how rare?

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National Science Review 2020年第6期7卷 945-946页

作者： Chung-I Wu guo-dong wang Shuhua Xu School of Life Sciences Sun Yat-Sen University Kunming Institute of Zoology Chinese Academy of Sciences Center for Excellence in Animal Evolution and Genetics Chinese Academy of Sciences CAS-MPG Partner Institute for Computational Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences

This Special Topic contains one perspective and three original articles that address the topic of convergent evolution. How common, and how important, is convergent adaptation in evolution? These are the questions the... 详细信息

关键词： CANCER SELECTION

Microstructural Evolution and Properties of a High Strength Steel with Different Direct Quenching Processes

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Journal of Iron and Steel Research International 2015年第4期22卷 344-351页

作者： Feng LU Chao wang Long L Zhao-dong wang guo-dong wang Raja Devesh Kumar MISRA State Key Laboratory of Rolling and Automation Northeastern University Department of Metallurgical and Materials Engineering University of Texas at El Paso

A high strength low alloy steel with low carbon equivalent was selected for simulating online direct quench- ing and coiling （DQ-C） process. The influence of stop quenching temperature on mechanical properties and micro- structures was studied and compared with normal direct quenching and tempering （DQ-T） process. The study con- firmed that required mechanical properties were obtained for both the processes. Properties of the experimental steel with DQ-C process could reach the same level as that of DQ-T process in general. In the DQ-C process, strength de- creased with increase in stop quenching temperature. Martensite was obtained and experienced an aging process at stop quenching temperature below Mi. On fast cooling below Mi, martensite was partially transformed and carbon partitioning occurred during slow cooling. The reduction in solid solution carbon and increased amount of retained austenite led to lower strength compared with the DQ-T process. DQ-C process was more favorable for microalloy carbide precipitation. However, impact toughness under different cooling conditions was adequate because of low car- bon equivalent and refined microstructure.

关键词： high strength steel direct quenching slow cooling carbon partitioning precipitation

Effect of phosphorus on the microstructure and mechanical properties of strip cast carbon steel

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International Journal of Minerals,Metallurgy and Materials 2010年第4期17卷 417-422页

作者： Na Li Zhen-yu Liu guo-ping Zhou Xiang-hua Liu guo-dong wang School of Materials and Metallurgy University of Science and Technology Liaoning Anshan 114051 China The State Key Laboratory of Rolling and Automation Northeast University Shenyang 110819 China

Carbon steel strips with different phosphorus and carbon contents were produced by using the twin roll strip casting process. Fine grains and dendrite structure were observed in high-P steels. Negative phosphorus segregation was found in strip cast high-P and high-C steels. For the steels with different carbon contents, phosphorus distribution in the thickness direction of the strip is obviously different. This is because solutes are redistributed in the melting pool and the phosphorus segregation rate is associated with the length of the mushy zone and the phosphorus solubility in different phases. Phosphorus as a solute in ferrite can lead to the higher hardness and strength with lower plastic propertyies.

关键词： phosphorus strip cast segregation mushy zone mechanical properties