检索结果-南通市图书馆

Acta Metallurgica Sinica(English Letters) 2015年第2期28卷 139-146页

作者： Qiang Guo Jian-Hua Liu Mei Yu Song-Mei Li Key Laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and Engineering Beihang University

The influence of rust layers on the corrosion behavior of ultra-high strength steel 300M subjected to a simulated coastal atmosphere was investigated by corrosion weight loss, surface analysis techniques, and electrochemical methods. The results exhibit the presence of a large proportion of γ-FeOOH and α-FeOOH and a small amount of Fe3O4 in the outer rust layer. During the wet-dry cyclic process, the bonding performance and the density of outer rust layer deteriorate with the thickness of outer rust. The inner rust layer plays a main role on protectiveness, which can be attributed to the formation of an ultra-dense and adherent rust film with major constituent of α-FeOOH and α-Fe2O3 on the steel.

关键词： ultra-high strength steel Wet-dry Chloride Corrosion Rust

Microstructural evolution of Al-Si coating and its influence on high temperature tribological behavior of ultra-high strength steel against H13 steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and steel Research(International) 2017年第10期24卷 1048-1058页

作者： Meng-xuan Guo Kai-xiang Gao Wu-rong Wang Xi-cheng Wei School of Materials Science and Engineering Shanghai UniversityShanghai 200072China

Al-Si coated ultra-high strength steel（UHSS）has been commonly applied in hot stamping process.The influence of austenitizing temperature on microstructure of Al-Si coating of UHSS during hot stamping process and its tribological behavior against H13 steel under elevated temperature were simulatively investigated.The austenitizing temperature of Al-Si coated UHSS and its microstructual evolution were confirmed and analyzed by differential scanning calorimetry and scanning electron microscopy.A novel approach to tribological testing by replicating hot stamping process temperature history was presented.Results show that the hard and stable phases Fe_2Al_5＋FeAl_2 formed on Al-Si coating surface after exposure to 930°C for 5 min,which was found to be correlated to the tribological behavior of coating.The friction coefficient of coated steel was more stable and higher than that of uncoated one.The main wear mechanism of Al-Si coated UHSS was adhesion wear,while abrasive wear was dominant for the uncoated UHSS.

关键词： Hot stamping Al-Si coating ultra-high strength steel Intermetallic compound Diffusion Friction coefficient Adhesive wear

Manifestations in Corrosion Prophase of ultra-high strength steel 30CrMnSiNi2 A in Sodium Chloride Solutions

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2014年第2期29卷 367-373页

作者：刘建华 WEN Chen YU Mei LI Songmei WANG Ruiyang Materials Science & Engineering School Beihang University

The corrosion behaviors of ultra-high strength steel 30CrMnSiNi2A in sodium chloride solution were studied by weight loss and electrochemical methods. The morphology of corrosion products was observed using scanning electron microscopy（SEM） and the composition was analyzed using an energy dispersive spectroscopy（EDS） and X-Ray diffraction （XRD）. The experimental results showed that the corrosion came from pitting corrosion and the rust layer was composed of outer rust layer γ-FeOOH and inner rust layer Fe_2O_3 with a little β-FeOOH. The correlation between corrosion rate and test time accorded with exponential rule. The corrosion current measured by polarization methods was higher than that calculated by weight loss method after a long-time immersion, the main reason was that,β-FeOOH and γ-Fe_2O_3 transformed by γ-FeOOH led to overestimating corrosion rate. The processes of corrosion prophase were obtained from XRD and EIS results. The corrosion product, Fe（OH）_2 formed at the initial stage stayed at a non-steady state and then consequently transferred to γ-FeOOH, γ-Fe_2O_3 or β-FeOOH.

关键词： 30CrMnSiNi2A ultra-high strength steel sodium chloride corrosion prophase

Effect of Thermomechanical Treatment Temperature on Structure and Properties of CFB/M ultra-high strength steel

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4期17卷 66-72页

作者： XU Xue-xia BAI Bing-zhe LIU Dong-yua YUAN Ye Laboratory of Advanced Materials Department of Materials Science and Engineering Tsinghua UniversityBeijing 100084 China Hebei Electric Power Research Institute Shijiazhuang 050021 Hebei China School of Energy and Power Engineering North China Electric Power University Beijing 102206 China Northwest Electric Power Design Institute Xi’an 710075 Shaanxi China

Modified CCT diagram of carbide-flee bainite-martensite （CFB/M） ultra-high strength steel was established by applying controlled cooling of small samples. In addition, the influence of thermomechanical treatment tem- perature on the structure and properties was discussed. The experimental results showed that when deformed at 860℃ and below, ferrite transformation occurred due to strain. With the decrease of ausforming temperature, the quantity of ferrite increased and strength and toughness were deteriorated. Therefore, certain information was provided for optimizing technical parameter of ausforming process., firstly, the thermomechanical treatment temperature should not be lower than 860 ℃ in order to avoid ferrite formation induced by deformation; secondly, rapid cooling rate is also significant after deformation in order to avoid ferrite precipitation during subsequent cooling stage.

关键词： thermomechanical treatment carbide-free bainite/martensite （CFB/M） ultra-high strength steel

Effect of Martensite Fine Structure on Mechanical Properties of an 1100 MPa Grade ultra-high strength steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and steel Research(International) 2015年第7期22卷 645-651页

作者： Fan ZHEN Kuan ZHANG Zhi-long GUO Jin-bo QU Institute of Research of Iron and steel(IRIS) Sha-steel Heavy Plate Plant Sha-steel

An 1100 MPa grade ultra-high strength steel with different martensite fine structures, characterized by prior austenite grain size, martensite packet size, block width and lath width, was studied by various heat treatment processes. The result shows that with decreasing prior austenite grain size, both the packet size and block width decrease, while the lath width has virtually no change. Accordingly, both strength and toughness increase, while total elongation decreases. The yield strength has a Hall Petch type relationship with the prior austenite grain size, packet size and block width, and the block width may be regarded as a key factor influencing strength. On the other hand, the ductile to brittle transition temperature （DBTT） is found to be more related lo the packet size, which may be considered as a dominant factor influencing toughness.

关键词： martensite fine structure ultra-high strength steel austenitization time packet size block width

Newly Designed Cr-Mn Alloyed ultra-high strength steel without Boron Addition for Hot-stamping Processing

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and steel Research(International) 2015年第12期22卷 1144-1148页

作者： Guo-hui ZHU Hong-bing ZHOU Qin-yi LI Qi-wei CHEN Hai-rong GU Yong-gang LIU Anhui University of Technology Ma'anshan Iron & steel Company Limited

A newly designed hot-stamping steel alloyed by chromium （Cr） and manganese （Mn） without boron （B） addition was developed for automobile mass reduction. The experimental results showed the Cr-Mn alloyed steel could be quenched to full martensite microstructure when the cooling rate was higher than 14 ℃/s. Yield strength, tensile strength and elongation of the experimental hot stamping part reached 1 180 MPa, 1 645 MPa and 8.4% , respectively. The experimental hot stamping part possessed higher tensile strength and elongation, compared with conventional hot-stamping steel of 22MnB5. Furthermore, excellent processing flexibility would be obtained in this novel hot-stamping steel because of its lower critical cooling rate and phase transformation temperature. The design of the composition and investigations of microstructure, mechanical properties and hot-stamping processing were also studied.

关键词： hot-stamping ultra-high strength steel finite element method mechanical property

Analysis of the effect of geometrical parameters on fatigue performance of spot-weld joint for ultra-high strength steel

在线全文

学校读者我要写书评

暂无评论

China Welding 2016年第4期25卷 34-41页

作者：宇慧平胡明清刘跃华李晓阳陈树君 College of Mechanical Engineering and Applied Electronics Technology Beijing University of TechnologyBeijing100124China Baic Motor Corporation Ltd. Beijing101300

This paper studied the spot welding structure of ultra-high strength steel 22MnB5.ANSYS software was adopted to simulate its static strength;BS5400 algorithm was used to calculate the fatigue life;and the grouping method was used to test the fatigue performance of tensile shear spot weld specimens.The simulation results were in good agreement with the experimental values.Based on the validation of the simulation method,influences of different structural parameters on static strength and fatigue life were explored by adopting single factor.The results showed that within the selected structure parameter range,increase of the sheet thickness,nugget diameter,sheet width and overlapping length can lead to longer fatigue life.Besides,the fatigue life of spot weld took on a linear relationship with the overlapping length,a DoseResp relationship with the sheet thickness,and a single exponential decay relationship with the sheet width and the nugget diameter.Moreover,in order to estimate the impact from various parameters on the fatigue life of the specimens,the Taguchi orthogonal design method was applied in the simulation design.The simulating result indicated that influence of the sheet thickness on fatigue life was the most significant.In addition,the effects of nugget diameter,sheet width and overlapping length on fatigue life were reduced in turn.

关键词： ultra-high strength steel spot weld fatigue life numerical simulation Taguchi orthogonal design

Microstructure and Mechanical Properties of 1,000 MPa ultra-high strength Hot-Rolled Plate steel for Coal Mine Refuge Chamber

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2014年第3期27卷 422-429页

作者： Changsheng Li Biao Ma Tao Li Tao Zhu State Key Laboratory of Rolling and Automation Northeastern University

The 1,000 MPa ultra-high strength hot-rolled plate steel with low-carbon bainitic microstructure was developed in the laboratory for coal mine refuge chamber. The static recrystallization behavior, microstructure evolution, and mechanical properties of this hot-rolled plate steel were investigated by the hot compression, continuous cooling trans- formation, and tensile deformation test. The results show that the developed steel has excellent mechanical properties at both room and elevated temperature, and its microstructure mainly consists of lath bainite, granular bainite, and ferrite after thermal-mechanical control process （TMCP）. The ultra-high strength plate steel is obtained by the TMCP process in hot rolling, strengthened by bainitic transformation, microstructure refinement, and precipitation of alloying elements such as Nb, Ti, Mo, and Cu. The experimental steel has relatively low welding crack sensitivity index and high atmospheric corrosion resistance index. Therefore, the developed steel has a good balance of strength and ductility both at room and elevated temperature, weldability and corrosion resistance, and it can suffice for the basic demands for materials in the manufacture of coal mine refuge chamber.

关键词： ultra-high strength steel Low-carbon bainite Coal mine refuge chamber Microstructure Mechanical property

STRAIN INDUCED MATENSITIC TRANSFORMATION IN FATIGUE CRACK TIP ZONE FOR AN ultra-high strength steel

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1988年 20-26页

作者： GAO Huilin TAN Yuxu WANG Xiaotian Xi’an Jiaotong University,Xi’an,China Professor,Institute of Metallic Materials and strength,Xi’an Jiaotong University,Xi’an,China

Retained austenite is transformed into martensite in the fatigue plastic zone in amatensitic ultra-high strength low carbon steel.The influence of the strain inducedtransformation on the fatigue behavior has been disc... 详细信息

关键词： ultra-high strength steel fatigue fracture martensite transformation

Internal oxidation of hot-rolled ultra-high strength steel and its effect on the surface quality of cold-rolled sheets

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Baosteel Technical Research 2021年第1期15卷 1-8页

作者： TANG Wenjie JIN Xinyan HU Guangkui CHEN Guang Cold Rolling Plant Baoshan Iron&Steel Co.Ltd.Shanghai 201900China Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China State Key Laboratory of Development and Application Technology of Automotive steels(Baosteel) Shanghai 201999China Products&Technique Management Department Baoshan Iron&Steel Co.Ltd.Shanghai 201999China

In this study,the scale and internal oxidation of hot-rolled ultra-high strength steel sheets were characterized.It was found that both the formation of the scale and the internal oxidation of Si and Mn depended on the coiling temperature and position of the steel sample on the strip coil.At a relatively high coiling temperature,a large amount of internal oxidation was observed on the samples cut from the middle of the coil.The depth of the internal oxidation zone exceeded 10 μm and a thin iron layer covering the scale was observed in some cases.Pickling and cold-rolling experiments were conducted on selected samples.Scale pickling was found to be greatly delayed by the formation of an iron layer,which frequently resulted in under-pickled defects.In addition,pickling of the entire internal oxidation zone was difficult,except at the grain boundaries,where the degree of internal Si and Mn oxidation was enriched.The surface of the cold-rolled steel sheet was ruined by the remaining oxidation zone in the subsurface of the pickled steel.The internal oxidation of hot-rolled ultra-high strength steel must be precisely controlled to improve the subsequent surface quality of cold-rolled steel.

关键词： ultra-high strength steel internal oxidation hot rolling pickling cold rolling