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Strengthening Mechanism of a New 700 MPa Hot Rolled High Strength Steel

Journal of Iron and Steel Research International 2008年第2期15卷 76-80页

作者： YI Hai-long DU Lin-xiu WANG Guo-dong LIU Xiang-hua State Key Laboratory of Rolling Technology and Automation Northeastern University Shenyang 110004 Liaoning China

The microstructural evolution in a 700 MPa hot rolled high strength steel was analyzed in terms of strengthening *** results show that the hot rolled sheet steel has yield strength of 710 MPa with good elongation and *** strength of the developed 700 MPa hot rolled high strength steel is derived from the cumulative contribution of fine grain size,dislocation hardening and precipitation *** fine grain strengthening and precipitation hardening are the dominant factors responsible for such high strength,and the amount of precipitation hardening is two or four times higher than that of conventional microalloyed hot rolled sheet steels reported in the *** toughness is due to refinement of ferrite grain size.

关键词： high strength steel strengthening mechanism dislocation hardening precipitation hardening

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Modeling of Strain-Induced Precipitation Kinetics and Evolution of Austenite Grains in Nb Microalloyed Steels

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Journal of Iron and Steel Research International 2008年第3期15卷 65-69页

作者： ZHOU Xiao-guang LIU Zhen-yu YUAN Xiang-qian WU Di WANG Guo-dong LIU Xiang-hua State Key Laboratory of Rolling Technology and Automation Northeastern University Shenyang 110004 Liaoning China

Considering the effect of strain and chemical composition onprecipitation behavior, new models for the start and end time of Nb（C,N） precipitation in austenite under the conditions of different temperatures and strains have been investigated for Nb microalloyed steel. The value of n in the precipitation kinetic equation has been determined by using the available experimental data in literature, which indicated that n is a constant and independent of temperature. The values of the start and end time of the predicted precipitation are compared with the experimental values. Calculated results are in good agreement with the experimental results. Also, the evolution of austenite grains before ferrite transformation is simulated by taking the effect of precipitation into consideration. The measured austenite grain size is in good agreement with predicted one prior to ferrite transformation.

关键词： strain-induced precipitation start time precipitation static recrystallization grain size

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Self-Learning and Its Application to Laminar Cooling Model of Hot Rolled Strip

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Journal of Iron and Steel Research International 2007年第4期14卷 11-14页

作者： GONG Dian-yao XU Jian-zhong PENG Liang-gui WANG Guo-dong LIU Xiang-hua State Key Laboratory of Rolling Technology and Automation Northeastern University Shenyang 110004 Liaoning China

The mathematical model for online controlling hot rolled steel cooling on run-out table （ROT for abbreviation） was analyzed, and water cooling is found to be the main cooling mode for hot rolled steel. The calculation of the drop in strip temperature by both water cooling and air cooling is summed up to obtain the change of heat transfer coefficient. It is found that the learning coefficient of heat transfer coefficient is the kernel coefficient of coiler temperature control （CTC） model tuning. To decrease the deviation between the calculated steel temperature and the measured one at coiler entrance, a laminar cooling control self-learning strategy is used. Using the data acquired in the field, the results of the self-learning model used in the field were analyzed. The analyzed results show that the self-learning function is effective.

关键词： laminar cooling hot rolled strip self-learning process control model

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Effect of Annealing Treatment on Precipitates and Tensile Properties of FeCoCrNiVN High-Entropy Alloy Produced by Twin-Roll Casting

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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE 2024年第7期33卷 3374-3383页

作者： Ran, Rong Zhang, Yuan-xiang Wang, Yang Wang, Guo-dong Northeastern Univ State Key Lab Rolling & Automation RAL Shenyang 110819 Peoples R China

In the present work, an as-cast strip of novel high entropy alloy (Fe48.8Co26.9Cr9.7Ni5.7V8.3N0.6 at.%) was successfully produced by twin-roll casting technology. Then, the as-cast strip with or without primary annealing was cold-rolled and annealed. The directly cold-rolled and annealed samples consisted of single-phase FCC and they were easier to recrystallize. While many granular VN particles precipitated during primary annealing. Besides, after secondary annealing, the dual phases microstructure of FCC+BCC was obtained. The BCC phase made the alloy have high recrystallization resistance and inhibited grains growth, causing refined grains in secondary annealed samples. The grain size was refined to 1.26 mu m when annealed at 800 degrees C, the corresponding recrystallization fraction was only 60.9%. When annealing at 1000 degrees C, the content of BCC decreased, resulting in larger grain size (similar to 8.13 mu m) and fully recrystallized structure. The secondary annealed sheets showed excellent tensile properties, the ultimate tensile strengths were 770-898 MPa and corresponding total elongations were 32-46%.

关键词： high entropy alloy recrystallization tensile behavior twin-roll casting

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Effect of Heat Input and M-A Constituent on Microstructure Evolution and Mechanical Properties of Heat Affected Zone in Low Carbon Steel

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Journal of Wuhan University of technology(Materials Science) 2017年第5期32卷 1163-1170页

作者：王壮飞石明浩 TANG Shuai WANG Guodong State Key Laboratory of Rolling and Automation Northeastern University School of Material Science and Engineering Shenyang University of Technology

Microstructure evolution and impact toughness of simulated heat affected zone（HAZ） in low carbon steel have been investigated in this study. Thermal simulator was used to simulate microstructure evolution in HAZ with heat input of 10-100 kJ/cm welding thermal cycle. Results indicated that microstructure of HAZ mainly consisted of acicular ferrite（AF） inside grain and high volume fraction of grain boundaries ferrite（GBF） at prior austenite boundaries; the size of GBF and effective grain size increased with increasing heat input. Excellent impact toughness（more than 150 J at-40 ℃） was obtained in HAZ with heat input less than 50 k J/cm. When heat input was 100 kJ/cm, the impact toughness of HAZ decreased to 18 J because of the presence of large M-A constituent with lath-form in HAZ, assisting the micro-crack initiation and decreasing the crack initiation energy seriously. Effect of inclusions on acicular ferrite transformation in HAZ was also discussed.

关键词： heat affected zone（HAZ） inclusions impact toughness heat input M-A constituent

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Effect of Fast Cooling Rate on the Microstructure and Mechanical Properties of Low-Carbon High-Strength Steel Annealed in the Intercritical Region

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Journal of Wuhan University of technology(Materials Science) 2014年第3期29卷 572-577页

作者：李壮田勇 KANG Shaopu ZHENG Zhen LIU Ming School of Materials Science and Engineering Shenyang Aerospace University State Key Lab of Rolling and Automation Northeastern University

The effect of fast cooling rate on the microstructure and mechanical properties of low-carbon high-strength steel annealed in the intercritical region was investigated using a Gleeble 1500 thermomechanical simulator and a continuous annealing thermomeehanical simulator. The results showed that the microstructure consisted of ferrite and bainite as the main phases with a small amount of retained austenite and martensite islands at cooling rate of 5 and 50 ℃/s, respectively. Fast cooling after continuous annealing affected all constituents of the microstructure. The mechanical properties were improved considerably. Ultimate tensile strength （U-TS） increased and total elongation （TEL） decreased with increasing cooling rate in all specimens. The specimen 1 at a cooling rate of 5 ℃/s exhibited the maximum TEL and UTSxTEL （20% and 27 200 MPa%, respectively） because of the competition between weakening by presence of the retained austenite plus the carbon indigence by carbide precipitation, and strengthening by martensitic islands and precipitation. The maximum UTS and YS （1 450 and 951 MPa, respectively） were obtained for specimen 2 at a cooling rate of 50 ℃/s. This is attributed to the effect of dispersion strengthening of finer martensite islands and the effect of precipitation strengthening of carbide precipitates.

关键词： cooling rate low-carbon high-strength steel intercritical annealing microstructure mechanical properties

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Comparative Study of Tensile and Charpy Impact Properties of X70 and X80 Linepipe Steels After Ultra Fast Cooling Processing

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Journal of Wuhan University of technology(Materials Science) 2017年第3期32卷 654-660页

作者：李壮田勇 SHAO Zhenyao WEI Zhanshan College of Materials Science and Engineering Shenyang Aerospace University State Key Lab of Rolling and Automation Northeastern University

Ultra fast cooling（UFC） processing after hot deformation was conducted on X70 and X80 linepipe steels. Tensile and charpy impact properties of both steels have been investigated in this work. The results have shown that the mechanical properties satisfy all the standard requirements of the X70 and X80 steels. UFC results in a presence of microstructure containing quasi polygonal（QF）, acicular ferrite（AF） and granular bainite（GB）. The alloying elements and UFC enhance the strengthening contribution caused by solid solution, dispersion, dislocation and precipitation strengthening. The size and distribution of precipitates in the linepipe steels are fine and dispersed. MA is also homogeneously dispersed due to UFC. Average grain size in the X80 steel is finer than that in the X70 steel. The volume fractions of secondary phases in the X80 steel are greater than those in the X70 steel. The X80 steel remains finer and more dispersed precipitates compared to the X70 steel. As a result, the tensile properties of X80 steel are higher than those of X70 steel. The Charpy absorbed energies of X70 and X80 steels at-10 ℃ reached 436 and 460 J, respectively. They reached 433 and 461 J at-15 ℃, respectively. This is mainly attributed to the presence of larger amounts of AFs in the X80 steel. A microstructure of AF for the X80 steel results in combining high strength and high toughness.

关键词： linepipe steel ultra fast cooling（UFC） Charpy impact properties acicular ferrite（AF）

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Effects of texture and mechanical anisotropy on the superplastic behavior in warm-rolled Fe–10Mn–4Al–1.5Si–0.3C medium Mn steel

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Materials Science and Engineering: A 2025年 937卷

作者： Zhang, H.T. Xiao, N. Sun, S.H. Yan, H.L. Cai, M.H. School of Materials Science and Engineering Northeastern University Shenyang110819 China Analytical and Testing Center Northeastern University Shenyang110819 China Xi'an Rare Metal Materials Institute Co. Ltd 96 Weiyang Road Xi'an710016 China State Key Lab of Rolling and Automation Northeastern University Shenyang110819 China

This study investigates the mechanical anisotropy and superplastic behavior of warm-rolled Fe–10Mn–4Al–1.5Si–0.3C steel, emphasizing the relationship between texture evolution and deformation-induced ferrite transformation. Experimental results reveal exceptional superplasticity in the rolling direction (RD), with a maximum elongation of 1564 %, significantly exceeding that of hot-rolled and cold-rolled medium Mn steels. The transverse direction (TD) and diagonal direction (DD) samples exhibited elongations of 620 % and 1060 %, respectively. The observed mechanical anisotropy is primarily attributed to texture evolution and dynamic ferrite transformation (γ→α). The RD sample exhibited a strong FCC Cube texture after warm rolling, which facilitated deformation-induced ferrite transformation during superplastic deformation. This transformation refined the microstructure and enhanced grain boundary sliding (GBS), leading to superior elongation. In contrast, the TD sample retained a dominant Brass rolling texture of FCC phase, which limited ferrite transformation and reduced superplasticity. Strain rate sensitivity (m) analysis at 800 °C confirmed GBS as the primary deformation mechanism, with the RD sample showing the highest m value of 0.72, correlating with its superior elongation. Further, dynamic grain co-rotation maintained the Kurdjumov–Sachs orientation relationship between deformation-induced α-ferrite and parent γ-austenite grains, facilitating GBS and uniform deformation. This study highlights the critical role of optimizing initial texture and phase transformation behavior in enhancing the superplasticity of warm-rolled medium Mn steels, providing valuable insights for improving superplastic forming processes. © 2025 Elsevier B.V.

关键词： Superplastic deformation

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Microstructures and Mechanical Properties of a New Multi-functional 460 MPa Grade Construction Structural Steel

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Acta Metallurgica Sinica(English Letters) 2022年第7期35卷 1131-1142页

作者： Zhenye Chen Zhangguo Lin Jianjun Qi Yang Feng Liqing Chen Guodong Wang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China User Technology Department Technology Research Institute of HBISShijiazhuang 050000China

This article reports a new generation of Q460 multi-functional construction structural steel,which has high strength(yield strength larger than 460 MPa),excellent toughness(higher than 110 J/cm^(2) at-60 ℃),lower yield ratio(lower than 0.8),good fire resistance(yield strength at 600 ℃ larger than two-thirds of its room-temperature yield strength)and better corrosion *** eff ects of finish cooling temperature(FCT)on the microstructure and properties were studied by scanning electron microscopy(SEM),transmission electron microscopy(TEM),emission electron probe micro-analysis(EPMA),electron backscattering diff raction(EBSD),tensile tester,impact tester,periodic immersion cycle acceleration test and electrochemical *** results show that the strength and toughness are simultaneously improved by decreasing the FCT due to more lath-like bainite with large number of dislocations,refined martensite/austenite(M/A)with higher carbon concentration and increased high angle *** addition,the fire resistance of the newly developed Q460 steel is obviously better than the conventional one,which is mainly due to non-recrystallized lath-like bainite with high dislocation density at elevated *** corrosion resistance of the new Q460 steel is also improved due to the addition of Cu and Cr.

关键词： Construction structural steel Thermo-mechanical controlled processing(TMCP) Finish rolling temperature Microstructure Mechanical properties

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Adaptive threading strategy based on rolling characteristics analysis in hot strip rolling

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Journal of Central South University 2017年第7期24卷 1560-1572页

作者： PENG Wen CHEN Shu-zong GONG Dian-yao LIU Zi-ying ZHANG Dian-hua State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Research Institute of Technology Shougang GroupBeijing 100041China

In order to improve the threading stability and the head thickness precision in tandem hot rolling process, an adaptive threading strategy was proposed. The proposed strategy was realized by the rolling characteristics analysis, and factors which affect the rolling force and the final thickness were determined and analyzed based on the influence coefficients calculation process. An objective function consisting of the influenced factors was founded, and the disturbance quantity was obtained by minimizing the function with the Nelder-Mead simplex method, and the proposed adaptive threading strategy was realized based on the calculation results. The adaptive threading strategy has been applied to one 7-stand hot tandem mill successfully, actual statistics data show that the predicted rolling force prediction in the range of +/- 5.0% is improved to 97.8%, the head thickness precision in the range of +/- 35 mu m is improved to 98.5%, and the threading stability and the head thickness precision are enhanced to a high level.

关键词： hot strip rolling adaptive threading rolling characteristics analysis influence coefficients method simplex algorithm

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