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Journal of Iron and Steel Research International 2014年第1期21卷 30-40页

作者： xin-ping MAO Qi-lin CHEN xin-jun sun College of Materials Science and Metallurgical Engineering Wuhan University of Science and Technology Institute of Structural Materials Central Iron and Steel Research Institute

The grain refinement mechanism and synergistic effect of Mn and Ti involved in the Ti-microalloying technology of thin slab casting and direct rolling （TSCR） were elucidated. Because the inevitable precipitation of TiN in high Ti-containing liquid steel decreases the volume fraction of TiN precipitated from austenite and the rapid coarse- ning rate leads to a large size of TiN particles, a relatively weak inhibition effect on the recrystallized grain growth was obtained compared with that in the low Ti-containing steel. However, the ferrite grain size in high Ti-containing steel can be refined by the so-called non-recrystallization rolling. The complex addition of Mn and Ti can improve the strength and toughness of strip remarkably, and the mechanisms are that Mn decreases the transformation tempera- ture, refines the ferrite grains, and enhances the formation of bainite and TiC precipitation in ferrite.

关键词： thin slab casting direct roiling TSCR Ti-microalloying grain refinement precipitation

Manufacturing Technology and Application Trends of Titanium Clad Steel Plates

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Journal of Iron and Steel Research International 2015年第11期22卷 977-982页

作者： Hang SU Xiao-bing LUO Feng CHAI jun-chang SHEN xin-jun sun Feng LU Institute for Engineering Steel Central Iron and Steel Research Institute

Some of the major manufacturing processes and corresponding mechanical properties of titanium clad steel plates were analyzed, and the consequences of research, manufacturing, and application of titanium clad steel plates in both markets of China and overseas were also summarized. As an economical and environmentally friendly technology, the roll bonding process is expected to become the next-generation mainstream process for the manufacturing of titanium clad steel plate. Some of the crucial and most important technical problems of this particular process, including vacuum sealing technology, surface treatment process technology, application of a transition layer, and rolling process, were discussed along with the advantageous mechanical properties and life-cycle economy of these plates processed by this technology. Finally, the market needs, application trends, and requirements of titanium clad steel plate were also considered from industries of petrochemical, shipbuilding, marine, and electric power.

关键词： titanium clad steel plate manufacturing technology application trend petrochemical rolling marine

Effect of dissolved niobium on eutectoid transformation behavior

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Journal of Iron and Steel Research International 2017年第9期24卷 973-978页

作者： Qi-long Yong Zheng-yan Zhang xin-jun sun Jian-chun Cao Zhao-dong Li Department of Structural Steels Central Iron and Steel Research Institute Department of Materials Science and Engineering Kunming University of Science and Technology

The effect of dissolved niobium on the eutectoid transformation behavior in near-eutectoid high-carbon steels has been *** niobium is important in the eutectoid transformation *** increases the eutectoid carbon content significantly（by^0.0477% per 0.00001% dissolved niobium）,increases the hardenability of steel markedly,yields finer,more uniform,polygonal proeutectoid ferrite,induces a transition in morphology of eutectoid cementite from lamellar to somewhat spheroidal,and increases the misorientation angle of pearlite colonies from being focused near 0°to near 60°.

关键词： Niobium High carbon steel Eutectoid transformation Pearlite

Development of Ti–V–Mo Complex Microalloyed Hot-Rolled 900-MPa-Grade High-Strength Steel

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Acta Metallurgica Sinica(English Letters) 2015年第5期28卷 641-648页

作者： Ke Zhang Zhao-Dong Li xin-jun sun Qi-Long Yong jun-Wei Yang Yuan-Mei Li Pei-Lin Zhao Department of Materials Science and Engineering Kunming University of Science and Technology Central Iron and Steel Research Institute Department of Materials Science and Engineering Huazhong University of Science and Technology R&D Center Laiwu Iron and Steel Group Co Ltd

A new Ti-V-Mo complex microalloyed hot-rolled high-strength steel sheet was developed by controlling a thermo-mechanical controlled processing （TMCP） schedule, in particular with variants in coiling temperature. The effects of coiling temperature （CT） on various hardening mechanisms and mechanical properties of Ti-V-Mo complex mi- croalloyed high-strength low-alloy steels were investigated. The results revealed that the steels are mainly strengthened by a combined effect of ferrite grain refinement hardening and precipitation hardening. The variation in simulated coiling temperature causes a significant difference in strength, which is mainly attributed to different precipitation hardening increment contributions. When the CT is 600 ℃, the experimental steel has the best mechanical properties： ultimate tensile strength （UTS） 1000 MPa, yield strength （YS） 955 MPa and elongation （EL） 17%. Moreover, about 82 wt% of the total precipitates are nano-sized carbide particles with diameter of 1-10 nm, which is randomly dispersed in the ferrite matrix. The nano-sized carbide particles led to a strong precipitation hardening increment up to 310 MPa.

关键词： Hot-rolled high-strength steel Strengthening mechanism Nano-sized carbide Precipitationhardening Coiling temperature

Grain Size-Dependent Mechanical Properties of a High-Manganese Austenitic Steel

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Acta Metallurgica Sinica(English Letters) 2019年第6期32卷 746-754页

作者： Xiao-Jiang Wang xin-jun sun Cheng Song Huan Chen Shuai Tong Wei Han Feng Pan School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Department of Structural Steels Central Iron and Steel Research InstituteBeijing 100081China

The effect of grain size on the mechanical properties of a high-manganese(Mn)austenitic steel was investigated via electron-backscattered diffraction,transmission electron microscope,X-ray diffraction,and tensile and impact tests at 25°C and-196°*** Hall–Petch strengthening coefficients for the yield strength of the high-Mn austenitic steels were 7.08 MPa mm 0.5 at 25°C,which increased to 14 MPa mm 0.5 at-196°*** effect that the grain boundary strengthening had on improving the yield strength at-196°C was better than that at 25°*** impact absorbed energies and the tensile elongations were enhanced with the increased grain size at 25°C,while they remained nearly unchanged at-196°*** unchanged impact absorbed energies and the tensile elongations were primarily attributed to the emergence of the micro-twin at-196°C,which promoted the cleavage fracture in the steels with large-sized *** the grain size could improve the strength of the high-Mn austenitic steels without impairing their ductility and toughness at low temperature.

关键词： High-Mn steel Grain size Low-temperature toughness Hall–Petch Micro-twin

Microstructure and Mechanical Properties of Precipitation Strengthened Fire Resistant Steel Containing High Nb and Low Mo

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Journal of Iron and Steel Research International 2015年第4期22卷 337-343页

作者： Zheng-yan ZHANG Qi-long YONG xin-jun sun Zhao-dong LI jun-yu KANG Guo-dong WANG Department of Structural Steels Central Iron and Steel Research Institute State Key Laboratory of Rolling and Automation Northeastern University

Through the thermo-mechanical control process （TMCP）, a high Nb low Mo fire resistant steel with the yield strength （YS） of 521 MPa at room temperature （RT） and 360 MPa at elevated temperature （ET） of 600 ℃ was developed based on MX （M=Nb, V, Mo; X=C,N） precipitation strengthening. A series of tensile and con- stant load tests were conducted to study the mechanical properties at ET. The dynamic continuous cooling transfor- mation （CCT） as well as precipitation behavior of microalloy carbonitride was investigated by means of thermal sim- ulator and electron microscopy approaches. Results showed that the failure temperature of tested steel was deter- mined as 653 ℃, and the granular bainite was obtained when the cooling rate was higher than 10 ℃/s. In the rolled state, a certain amount of M/A islands was observed. During heating from RT to ET, M/A islands disappeared, and cementites and high dense compound precipitates （Nb, Mo, V）C with size of less than 10 nm precipitated in ferrite at ET （600 ℃）, which resulted in precipitation strengthening at ET.

关键词： fire resistant steel elevated temperature property microalloying granular bainite precipitation strengthening

A Novel Low-cost Hot Rolled High Strength Steel for an Automatic Teller Machine

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Journal of Iron and Steel Research International 2015年第3期22卷 272-278页

作者： Bin ZENG Zhao-dong LI xin-jun sun Qi-long YONG Yu-qing WENG Technical Center Lianyuan Iron and Steel Co.Ltd. Department of Structural Steels Central Iron and Steel Research Institute

A novel hot rolled steel LG600A with the tensile strength exceeding 700 MPa was developed for automatic teller machine application. Thelow-cost C-Mn steel was microalloyed with：0.08 mass%- 0.12 mass% Ti rather than noble alloying elements, such as Nb, V, Mo, and Cu, etc. The novel steel had a good surface quality and welding property. After the hot rolled steel coils were leveled, the steel plates, the length of which was even down to 1 500 mm, had an excellent flatness. The effects of hot rolling parameters on mechanical per formance, m icrostructure and recrystallization behavior were studied. The metallurgical concept for the steel production was also discussed. The result shows that decreasing the finish rolling temperature, increasing cooling rate in the first cooling stage and decreasing the cooling rate in the last cooling stage, together with coiling at a modestly high coiling temperature all resulted in the refined grains and TiC precipitates, thereby improving the strength and toughness of this new steel greatly.

关键词： automatic teller machine high strength steel microstructure rolling parameter

Austenite Grain Refinement and Isothermal Growth Behavior in a Low Carbon Vanadium Microalloyed Steel

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Journal of Iron and Steel Research International 2014年第8期21卷 757-764页

作者： Geng-wei YANG xin-jun sun Qi-long YONG Zhao-dong LI Xiao-xian LI Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and Technology Department of Structural Steel Central Iron and Steel Research Institute Department of Materials Science and Engineering Kunming University of Science and Technology

The austenite grain refinement through control of the grain growth during reheating process after thermomechanical controlled process （TMCP） in a vanadium microalloyed steel was achieved. The formation of ultra-fine grained austenite was attributed to the high density of austenite nucleation at the ferrite/martensite structure and to the inhibition of austenite growth by （Ti~ V）C particles at the relatively low reheating temperature. Corresponding with the precipitation behavior of （Ti,V）C with temperature, the growth behavior of austenite in the vanadium mi- croalloyed steel could be divided into two regions. At lower reheating temperature, austenite grains grew slowly, and ultra-fine grained austenite smaller than 5 ~m was successfully obtained. By contrast, the austenite grains grew rap- idly at high temperature due to the dissolution of （Ti, V）C particles. According to the measured and predicted results of austenite growth kinetics, two models were developed to describe the growth behavior of austenite grains in two different temperature regions, and the apparent activation energy Qapp for grain growth was estimated to be about 115 and 195 kJ/mol, respectively.

关键词： grain refinement austenization (Ti, V) C precipitationl grain growth austenite

Effect of Ti/V ratio on thermodynamics and kinetics of MC in γ/α matrices of Ti-V microalloyed steels

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Journal of Iron and Steel Research International 2021年第8期28卷 1019-1029页

作者： Ke Zhang xin-jun sun Zhao-dong Li Kun Xu Tao Jia Zheng-hai Zhu Xiao-yu Ye jun-yu Kang Qi-long Yong State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua Group Co.Ltd.Panzhihua 617000SichuanChina School of Metallurgical Engineering Anhui University of TechnologyMaanshan 243032AnhuiChina Institute of Structural Steels Central Iron and Steel Research InstituteBeijing 100081China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

Through the solubility product theory of the ternary secondary phase,classical nucleation theory,and Ostwald ripening theory,a model was established to describe the thermodynamics and kinetics of(Ti,V)C precipitates in austenite/ferrite(y/α)*** model was used to calculate the volume fraction,precipitation-temperature-time(PTT)curve,and nucleation rate-temperature(NrT)curve of MC(M=Ti,V)precipitates in γ/α matrices in Ti-V microalloyed steels with various Ti/V ratios,which is verified by hardness tester,transmission electron microscopy and energy-dispersive X-ray *** calculations indicate that,by decreasing Ti/V ratio from Ti4V0 steel to Ti0V4 steel,the complete-dissolution temperature decreases monotonically from 1226 to 830℃,and the equilibrium volume fraction of MC pre-cipitated from austenite decreases from 0.333%to 0.091%at 900℃.Moreover,the maximum nucleation temperature of MC precipitated from α matrix decreases from 748 to 605℃and the fastest precipitation temperature decreases from 844 to 675℃as Ti/V ratio *** and NrT diagrams of MC precipitated from α matrices in different Ti-V microalloyed steels all exhibit C-shaped and inverse C-shaped *** addition,both theoretical calculation and experimental results show that when tempered at 600℃for 100 h,Ti2V2 steel shows the largest hardness value of 312 HV among the three steels tested because it has a larger volume fraction(0.364%),a larger precipitate density(1689 μm-2),and the smallest average size(8.4 nm)of(Ti,V)C *** theoretical calculations are consistent with experimental results,which indicates that the thermodynamics and kinetics model for(Ti,V)C precipitates is reliable and accurate.

关键词： (Ti V)C precipitate Thermodynamics Kinetics Ti-V microalloyed steel Coarsening rate Hardness

Control of Secondary Phases by Solution Treatment in a N-Alloyed High-Mn Cryogenic Steel

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Acta Metallurgica Sinica(English Letters) 2018年第10期31卷 1059-1072页

作者： Xiao-Jiang Wang xin-jun sun Cheng Song Shuai Tong Luo-Jin Liu Huan Chen Wei Han Feng Pan Department of Materials Science and Engineering Tsinghua University Department of Structural Steels Central Iron and Steel Research Institute

The secondary phases of the steels have significant effects on the microstructure and mechanical properties, making controlling these secondary phases important. The control of MnS inclusions and A1N precipitates in a N-alloyed high-Mn twin-induced plastic cryogenic steel via solution treatment was investigated with several different techniques including microstructural characterization, 298 K tensile testing, and 77 K impact testing. The solutionizing temperature （ST） increased from 1323 to 1573 K, where the elongated MnS inclusions and large-sized AlN precipitates became spheroidized and dissolved. The aspect ratio of the MnS inclusions decreased as the ST increased and the number density increased. The impact toughness of the steels showed anisotropy and low impact energy values, due to the elongated MnS inclusions and large-sized AIN precipitates. The anisotropy was eliminated by spheroidizing the MnS inclusions. The impact energy was improved by dissolving the large-sized AlN precipitates during the solution treatment. The austenite grain size increased when the dissolution of the AlN precipitate increased, but the effect of the grain size on the yield strength, toughness, and the strength--ductility balance was weak.

关键词： Cryogenic Solutionizing temperature Low-temperature toughness Spheroidize Dissolution