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Acta Metallurgica Sinica(English Letters) 2019年第10期32卷 1207-1218页

作者： Xiao-Hui Wang Jian Kang Yun-Jie Li Guo Yuan R. D. K. Misra Guo-Dong Wang State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China Laboratory for Excellence in Advanced Steel Research Department of Metallurgical Material and Biomedical Engineering University of Texas at El Paso El Paso TX 79968 USA

In this study, the effect of cooling rates on microstructures and mechanical properties in a Al-bearing hot-rolled transformation- induced plasticity steel was investigated. The experiments were carried out using hot simulation machine and hot rolling mill, where the samples were cooled at different cooling rates. The results showed that with the increase in cooling rates, film-like retained austenite gradually disappeared and only blocky retained austenite was retained at higher cooling rates. The volume fraction of retained austenite was 9-11% at cooling rates of 0.05-1 ℃/s and 4-6% at cooling rates of 5-10 ℃/s. In addition, martensite/austenite island was observed because of the heterogeneous carbon distribution. The samples cooled at 0.05℃/s and 0.5 ℃/s exhibited excellent mechanical properties, with tensile strengths of 712 MPa and 726 MPa, total elongations of 42% and 36% and strength and ductility balances of 29.91 GPa% and 26.15 GPa%, respectively. During plastic deformation, the instantaneous work hardening exponent of the sample cooled at 0.05 ℃/s increased continuously until it reached the maximum value, while the instantaneous work hardening exponent of the sample cooled at 0.5℃/s remained stable.

关键词： hot-rolled TRIP steels Cooling rate Microstructures Mechanical properties Work hardening behavior

An Experimental Study on Constraint Cooling Process of hot-rolled CoilS

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Journal of Materials Science & Technology 2003年第Z1期19卷 220-222页

作者： Lijuan WANG Chunli ZHANG State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 China Shanghai Baosteel Group Corporation Shanghai 201900 China

In order to master mechanical property, surface quality and microstructure of constraint cooling (CC) coils undervarious water cooling parameters, more than 100 coils cooling experiments were done with real production process,of which is designed a cooling experimental instrument in the end. The experiments show that high initial coolingtemperature, discontinuous cooling style, and long cooling time can improve mechanical property of cooling coilsand shorten cooling time. The CC coils experiments cover the different steel grades, so that CC process effects onhot-rolled coils may be predicted and controlled actively.

关键词： Constraint cooling, hot-rolled coils, Experiment

Research on welding technology of hot-rolled extra-high-strength steel developed by Baosteel

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Baosteel Technical Research 2013年第3期7卷 3-9页

作者： QU Zhaoxia WANG Haitao XU Lei Welding and Corrosion Protection Department Research InstituteBaoshan Iron & Steel Co.Ltd.

In this study, the welding technology of the hot-rolled extra-high-strength steel, BS960QC, has been comprehensively investigated. Analysis has been made on the weldability ,the different welding procedures ,the mechanical properties, and the fatigue properties, and a set of recommendation guidelines have been proposed for evaluating the welded joints of the extra-high-strength steel. The research and results indicate that the hot-rolled extra-high-strength steel, BS960QC,has good weldability and an excellent adaptability to welding procedures. Further,the excellent mechanical properties and fatigue properties of the welded joints ,which can be achieved by using optimized welding procedures, can completely meet the technical requirements of the construction machinery industry.

关键词： hot-rolled extra-high-strength steel welding welding procedure fatigue property

Phase transformation behavior of a hot-rolled,titanium microalloyed steel during heating and continuous cooling

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Baosteel Technical Research 2018年第4期12卷 28-32页

作者： LIU Gang John G SPEER Caleb A FELKER Research Institute Baoshan Iron & Steel Co.Ltd. Advanced Steel Processing and Products Research Center Colorado School of Mines1500 Illinois St.

The critical transformation temperatures,A_(c1) and A_(c3),of a hot-rolled low-carbon titanium microalloyed steel were determined as a part of an examination of its phase-transformation behavior. Austenite decomposition during the continuous cooling of the titanium microalloyed steel was studied by heating it to 1 250 ℃,cooling it to 880 ℃,holding for 2 s,and then cooling it to room temperature at different cooling rates. The transformation kinetics( CCT curve) was characterized as well.

关键词： microalloyed steel hot-rolled precipitation phase transformation

Patenting of hot-rolled high-carbon steel and its applications

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Baosteel Technical Research 2015年第2期9卷 25-29页

作者： YANG Caiding LIU Sheng WANG Huanrong Research Institute Baoshan Iron & Steel Co.Ltd. Shanghai University

The patenting process of three hot-rolled steels with carbon mass contents of 0.70%-0. 90% was studied. The effect of the quenching temperature on the cementite lamellar distance in the steel was evaluated on the basis of microstructural characterization and mechanical property tests. The patenting treatment of high-carbon hot- rolled strip and its application in springs were discussed.

关键词： hot-rolled high-carbon steel patenting treatment application

Dependence of mechanical properties on the microstructure characteristics of a near β titanium alloy Ti-7333

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Journal of Materials Science & Technology 2019年第1期35卷 48-54页

作者： Ruifeng Dong Jinshan Li Hongchao Kou Jiangkun Fan Bin Tang State Key Laboratory of Solidification Processing Northwestern Polytechnical University National & Local Joint Engineering Research Center for Precision Thermoforming Technology of Advanced Metal Matfigerials

In this work, the microstructure and the corresponding tensile properties of the rolled Ti-7Mo-3Nb-3Cr-3Al(Ti-7333) alloy before and after the thermal treatments were investigated. The results show that a strong α-fiber texture is developed in the rolled Ti-7333 alloy. The deformed matrix and the texture significantly induce the variant selection of β phase. The high strength of the rolled Ti-7333 alloy is attributed to the texture parallel to the tensile direction and the dispersed α phase within the matrix. After the solution treatment followed by the aging treatment, the texture decreases and the microstructure consists of the equiaxed β grains, the spheroidal α_p phase and various needle-like α variants. Eventually, the alloy could achieve an optimal combination with the strength of about 1450 MPa,the ductility of about 10.5% and a considerable shear strength of about 775 MPa. This balance can be ascribed to the performance of the spheroidal α_p phase and various needle-like α_s variants. The results indicate that the Ti-7333 alloy could be a promising candidate material for the high-strength fastener.

关键词： Near β titanium alloy hot-rolled Ti-7333 Texture Thermal treatment α phase Mechanical properties

Effect of thermo-mechanical treatment on Ti–Ta-Hf high temperature shape memory alloy

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Progress in Natural Science:Materials International 2021年第5期31卷 779-782页

作者： Jun Li Xiaoyang Yi Haizhen Wang Kuishan Sun Jingjing Liu Xianglong Meng Zhiyong Gao College of Mechanical and Electrical Engineering Northeast Forestry University School of Materials Science and Engineering Harbin Institute of Technology College of Nuclear Equipment and Nuclear Engineering Yantai University

The microstructure, martensitic transformation and mechanical/functional properties of Ti–Ta-Hf alloys with various thermo-mechanical treatments were investigated. The results reveal that the hot-rolling could refine the grain size and introduce a certain number of defects, resulting in the disappearance of martensitic transformation.The as-casted and solution treated Ti–Ta-Hf alloys were composed of α’’ martensite phase and smaller volume of βphase. In contrast, the grain size of solution treated Ti–Ta-Hf alloy was slightly less than that of as-casted Ti–Ta-Hf alloy. This should be responsible to the higher yield stress and superior strain recovery characteristics for solution treated Ti–Ta-Hf alloy. The yield stress for the dislocation slip and the maximum recoverable strain of solution treated Ti–Ta-Hf alloy were 723 MPa and 5.06%, respectively.

关键词： High temperature shape memory alloy hot-rolled Microstructure Martensitic transformation Shape memory effect