检索结果-南通市图书馆

Analysis of Microstructure Characteristics and Precipitation Behavior of Automobile Beam Steels Produced by compact strip production

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2010年第3期17卷 56-61页

作者： ZHAO Zheng-zhi LIU Jie ZHAO Ai-min Metallurgical Engineering Research Institute University of Science and Technology Beijing Beijing 100083 China Shougang Research Institute of Technology Beijing 100041 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

The microstructure characteristics and precipitation behavior of automobile beam steels produced by compact strip production （CSP） were investigated by use of scanning electron microscopy （SEM） transmission electron microscopy （TEM） and X-ray energy dispersive spectroscopy. The result shows that the final microstructure is mainly composed of polygonal ferrite and small amount of pearlite, and the average ferrite grain size is about 3-6μm. Small amount addition Ti to aluminium-killed steel can help to refine the microstructure and improve the mechanical properties. A large number of fine precipitates have been observed in automobile beam steels. The mean particle size is about 10-30 nm. Remarkable strengthening and grain refinement can be obtained by these nano-particles.

关键词： compact strip production microstructure precipitation behavior

Numerical Simulation of Coupled Molten Steel Flow and Temperature Fields in compact strip production Casting

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2007年第3期14卷 20-25,46页

作者： LIU Xu-feng ZHANG Jie-yu DU Wei-dong ZHAI Qi-jie LI Qiang School of Materials Science Engineering Shanghai University Shanghai 200072 China School of Metallurgy and Resource Anhui University of Technology Ma＇anshan 243002 Anhui China

Based on the casting manufacture practice of steel slabs by CSP technology, the flow and the temperature fields of the funnel mould and the secondary cooling segment were simulated using the commercial code, CFX4. Compared with other physical investigations, the correlative data of the present simulation results are in good agreement with them. Therefore, a more comprehensive survey for metallurgy characteristic of the flow and the temperature fields in CSP continuous casting process can be achieved.

关键词： compact strip production numerical simulation flow field temperature distribution

Effect of boron on hot strips of low carbon steel produced by compact strip production

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2008年第2期15卷 138-142页

作者： Hao Yu Yonglin Kang School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

The effect of boron on hot strips of low carbon steel produced by compact strip production （CSP） to reduce the strength to a certain degree was investigated, which is quite different from that of high-strength low alloy steel. The mechanical properties and microstructural evolution of the hot strip were studied using optical microscopy and tensile tests. By means of an electrolytic dissolution technique and Thermo-Cal calculation, the precipitates containing boron were analyzed and detected. From the electron backscattered diffraction analysis, it can be deciphered whether the microstructure has recrystallized or not. Furthermore, the effect of boron segregation on the recrystallization or non-recrystallization conditions can be distinguished. The segregation behavior of boron was investigated in boron-containing steel. The nonequilibrium segregation of boron during processing was discussed on the basis of the forming complexes with vacancies that migrate to the boundaries prior to annihilation, which was confirmed by the subsequent cold rolling with annealing experiments.

关键词： compact strip production boron segregation electrolytic dissolution technique nonequilibrium segregation recrystallization

Texture Analysis in strips Produced by compact strip production （CSP） Process

在线全文

学校读者我要写书评

暂无评论

Texture Analysis in Strips Produced by Compact Strip Product...

Distribution behavior of inclusions in compact-strip-produced martensitic steel and its influence on mechanical properties

The China-Japan Joint Seminar on Atomic Level Characterization-2002

作者： Wang Yuanli Liu Delu Huo Xiangdong Department of Materials Physics and Chemistry University of Science and Technology Beijing 100083 Beijing China

＜正＞Textures of strip products produced by compact strip production（CSP）process have been analyzed by using Electron Backscattering Diffraction（EBSD）*** results show that the textures in the surface region are very different from that in the central area of *** texture in surface layer is dominantly＜101＞//TD（transverse direction）whereas the texture in central area is mainly＜112＞and＜113＞//*** microstructure of specimens during first pass deformation has also been observed by using optical *** original austenite grains in surface layer,the grain boundaries of which are decorated by polygonal ferrites,are elongated along the rolling direction by heavy shear deformation,while the original austenite grains in the central area are with polygonal *** texture distribution through the thickness direction has been discussed in terms of its deformation behavior during rolling process between the surface region and the central area.

关键词： compact strip production low carbon steel texture grain orientation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第11期142卷 98-111页

作者： Jing Wang Peng Xue Laiqi Zhang Li You Xiaodong Zhu Shuize Wang Yong Zhong Xinping Mao State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Research Institute Baoshan Iron&Steel Co.LtdShanghai 201999China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China

The distribution behavior of inclusions in martensitic steel produced by compact strip production process(CSP-MS)and its influence on mechanical properties were systematically *** inclusions in the CSP-MS specimen are mainly composed of spherical Al_(2)O_(3)-CaO-CaS,MnS with high aspect ratio and small-sized TiN,whereas many coarse cuboidal TiN inclusions do exist in conventional martensitic steel(Con-MS).The high inclusion density of the CSP-MS specimen resulted in lower total elongation and impact toughness,and the MnS inclusions with high aspect ratio led to significantly stronger mechanical anisotropy than that for Con-MS *** in-situ tensile results indicated that when the fracture direction is parallel to MnS direction,the microcracks induced by MnS inclusions tend to propagate into the matrix,leading to the formation of valley-like features,which significantly deteriorate the properties such as the total elongation and impact *** microcracks caused by TiN inclusions are sharper than those caused by spherical Al_(2)O_(3)-CaO-CaS inclusions,and are easy to propagate into the *** work is expected to guide the optimization of the mechanical properties of martensitic steels produced by CSP process and provide a theoretical basis for the CSP process design.

关键词： Martensitic steel compact strip production Inclusion distribution behavior Mechanical properties In-situ tensile test

Influence of inclusions on hydrogen-induced delayed cracking in hot stamping steels

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2019年第11期26卷 1199-1208页

作者： Yong Chen Jing Liu Feng Huang Ling Chen Yarbjing Su Gui-feng Zhou School of Materials and Metallurgy Wuhan University of Science and TechnologyWuhan 430080HubeiChina Wuhan Branch of Baosteel Central Research Institute(R&D Center)of Wuhan Iron&Steel Co. Ltd.Wuhan 430080HubeiChina Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China

The hydrogen-induced delayed cracking(HIDC)behaviors of two types of 1500 MPa grade hot stamping steels(HSSs)have been investigated by the method of slow strain rate tensile test and hydrogen permeation,where one is manufactured by compact strip production(CSP)process which is a revolution to the traditional HSS and the other by the traditional cold rolling *** results show that the performance of HSS produced by CSP is superior to that of the traditional HSS,due to lower hydrogen embrittlement index,lower hydrogen diffusion coefficient and lower hydrogen *** has been found that HIDC behavior is closely associated with *** inclusions of HSS produced by CSP are mainly spherical Al-Ca-O and CaS,while the inclusions in the traditional HSS are TiN+AI2O3+MnS with sharp edges and *** on these results,the influence of composition,shape and distribution of inclusions in HSS on HIDC and the mechanism of HIDC from the perspective of inclusions were analyzed and discussed.

关键词： compact strip production Hot stamping steel-Hydrogeinduced delayed cracking Inclusion Slow strain rate tensile test

Precipitates in Steels With Ti Additive Produced by CSP Process

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2009年第4期16卷 60-66页

作者： LOU Yan-zhi LIU De-lu NI Xiao-qing Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China

Hot strips of low carbon steels with Ti additive [-contain C 0.04 % -0. 07 % , Si≤0.6%, Mn≤0.6%, Ti 0. 060/00- 0.14% （mass percent）] prodvced by EAF-CSP （Electric Arc Furnaces-compact strip production） process were examined by TEM, HREM and XRD. Carbonitrides with different N/C ratio were found in the sam- ples. The varying composition of the Ti-carbonitrides resulted from the supersaturation of Ti and temperature at which the compound was formed. In the tested steel, total mass fraction of the precipitates including cementite, carbonitride and a small quantity of Fe3O4, AO2O3 , Ti2 CS and A1N was about 0. 305 %. XRD results showed that about a quarter of the powder extracted by electrolysis was titanium nitrides, carbonitrides and carbides. Particle arrays formed by interphase precipitation could be observed either in slabs or in hot strips. The dominant reaction mecha- nisms were discussed. Compared with the conventional cold charge process, small amount of Ti addition would be more effective for orecipitation of fine orecioitates in the steels oroduced by CSP process.

关键词： compact strip production steel with Ti additive titanium carbonitride precipitation interphase precipitation

Morphology and Precipitation Kinetics of MnS in Low-Carbon Steel During Thin Slab Continuous Casting Process

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2006年第5期13卷 30-36页

作者： YU Hao KANG Yong-lin ZHAO Zheng-zhi SUN Hao School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Jinan Iron and Steel Technical Center Jinan Iron and Steel Group Co Jinan 250101 Shandong China

The morphology of manganese sulfide formed during thin slab continuous casting process in low-carbon steel produced by compact strip production （CSP） technique was investigated. Using transmission electron microscopy analysis, it was seen that a majority of manganese sulfides precipitated at austenite grain boundaries, the morphologies of which were spherical or close to the spherical shape and the size of MnS precipitates ranged from 30 nm to 100 nm. A mathematical model of the manganese sulfide precipitation in this process was developed based on classical nucleation theory. Under the given conditions, the starting and finishing precipitation temperatures of MnS in the continuous casting thin slab of the studied low-carbon steel are 1 189 ℃ and 1 171 ℃, respectively, and the average diameter of MnS precipitates is about 48 nm within this precipitation temperature range. The influences of chemical components and thermo-mechanical processing conditions on the precipitation behavior of MnS in the same process were also discussed.

关键词： morphology thin slab continuous casting precipitation kinetics compact strip production TEM

Carbon Diffusion in Hot strips of Low Carbon Steel Produced by CSP Line under Different Thermal Histories

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2005年第1期21卷 21-24页

作者： HaoYU HaoREN YonglinKANG KeluWANG SchoolofMaterialsScienceandEngineering UniversityofScienceandTechnologyBeijingBeijing100083China LaiwuSteelGroupLTD. Laiwu271104China JinanIron&SteelGroupCo. Jinan250101China

Two experiments were carried out on the same compact strip production (CSP) line, which differs in that one of them experienced γ→α→γ thermal history. The differences in microstructure, precipitation, misorientation etc between two experiments were investigated by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron back-scattered diffraction (EBSD) and positron annihilation technique (PAT). The carbon concentration in matrix is more inhomogeneous in the experiment than that with γ→α→γ7 thermal history. The specific precipitation characteristic in the experiment without γ→α→γ thermal history is discussed on the basis of different carbon diffusion behavior and interaction between dislocation and excess carbon.

关键词： compact strip production Microstructure Precipitation Carbon diffusion Dislocation