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Microstructure of Ni-Based Self-Fluxing Alloy Coating(PartⅠ)

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Journal of Iron and Steel Research International 2005年第1期12卷 50-53页

作者： HUI Wei-jun DONG Han WENG Yu-qing WANG Mao-qiu CHEN Si-lian SHI Jie Central Iron and Steel Research Institute chinese society for metals

The delayed fracture behaviors of CrMo-type high strength steels containing different amount of titanium(0to 0.10%)were *** steels were quenched at 880℃ and tempered from 400℃ to 650℃,and a wide range of tensile strength was *** sustained load tensile test was carried out by using notched tensile specimens in Walpole *** experimental results showed that with higher strength,the Ti-microalloyed steels show higher resistance to delayed fracture compared with non-microalloyed steel due to titanium beneficial role and microstructure *** undissolved TiC is uniformly distributed as strong hydrogen traps,retarding or preventing the diffusion and accumulation of hydrogen to lower-interaction energy sites,such as prior austenite and martensite lath boundaries in stress concentration ***,the grain refining effect of titanium is also an important factor to improve the delayed fracture resistance of Ti-microalloyed *** characteristics of delayed fracture remain nearly the same with titanium addition.

关键词： titanium delayed fracture high strength steel CrMo steel

Effect of Heat Treatment on Delayed Fracture Resistance of High Strength Steel 30CrMnSi2NiNb

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Journal of Iron and Steel Research International 2003年第1期10卷 44-48页

作者： WANG Mao-qiu DONG Han HUI Wei-jun CHEN Si-lian WENG Yu-qing Central Iron and Steel Research Institute chinese society for metals

The steel specimens of nominal composition 0.3C-1.0Cr-1.0Mn-2.0Si-1.0Ni-0.04 Nb were quenched and tempered or isothermally quenched from various *** is found that the steel quenched and tempered with a tensile strength of 1 500-1 600 MPa has a KISCC（critical stress intensity factor） value below 15.0 MPa · m1/*** steel isothermally quenched with a tensile strength of 1 350-1 750 MPa has a KISCC value about 20.0 MPa·m1/*** addition,with increase of isothermal quenching temperature,the tensile strength decreases greatly and KISCC value does not pronouncedly *** microstructure of isothermally quenched specimens is composed of bainite and retained *** delayed fracture resistance is dependent on the stability of austenite,which is in turn related to the retained austenite volume fraction and carbon content in austenite.

关键词： high strength steel heat treatment mixed microstructure delayed fracture

Microstructures and mechanical properties of the third generation automobile steels fabricated by ART-annealing

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Science China(Technological Sciences) 2012年第7期55卷 1814-1822页

作者： CAO WenQuan WANG Chang WANG CunYu SHI Jie WANG MaoQiu DONG Han WENG YuQing Central Iron&Steel Research Institute(CISRI) Beijing 100081China chinese society for metals Beijing 100711China

The mechanical properties dependence on the microstructure was reviewed and analyzed,and the ultrafine grained duplex microstructure of BCC matrix and large fractioned austenite was given as one of the optimum structures to develop the third generation steel with high strength and high *** medium-Mn steels with different carbon contents processed by austenite reverted transformation(ART-annealing) were studied thoroughly to fabricate the ultrafine duplex steels with large fractioned *** lamellar typed ultrafine structure,the granular typed ultrafine duplex structure and the corresponding mechanical properties of the medium-Mn steels processed by ART-annealing were demonstrated in this *** was revealed that the duplex structure with large fraction of austenite and ultrafine grain structure is capable of producing steels with excellent combination of strength and ductility,i.e.,Rm A about 30-50 GPa%,which is about two times of that of the conventional automobile steels and close to that of the TWIP *** was concluded that the ART-annealing of the medium-Mn steels would be at least one of the promising ways to fabricate the third generation automobile steels in the near future.

关键词： automobile steel high strength and high ductility austenite reverted transformation(ART) m-Mn steel ultrafine grain size

Surface Ferrite Grain Refinement and Mechanical Properties of Low Carbon Steel Plates

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Journal of Iron and Steel Research International 2006年第4期13卷 35-39页

作者： FAN Jian-wen DAI Xiao-li XIE Rui-ping ZHANG Wei-xu WANG Zu-bin Shougang Research Institute of Technology Shougang Group Corporation Beijing 100041 China chinese society for metals Beijing 100011 China

Considering the specialities of the steel plate production, the TMCP study has been carried out with Gleeble 2000 tester to explore the possibility of fine grained ferrite in the low carbon steel plates with the chemical composition of C 0.13--0.18, Si 0.12-0.18, Mn 0.50-0. 65, P 0. 010-0. 025, and S 0. 005-0. 028. The plates with thickness of 8. 7 mm in which the ferrite grain size is smaller than 8μm have been produced by special de- formation process in the laboratory. Furthermore, the trial production of special plain carbon steel plates of 16-25 mm in thickness and 2 000- 2 800 mm in width with fine grained ferrite has been successfully carried out in the Shougang Steel Plate Rolling Plant. The ferrite grain size is 5.5-7μm in the surface layers and 9.5-15μm in the central layer respectively. The yield strength is 320- 360 MPa, tensile strength is 440-520 MPa and the elongation is 25%- 34 %. It is very important for the rolling plants to improve the low carbon steel plates＇ mechanical properties. The results show that the ferrite grains in the surface layer can be refined effectively by the appropriate rolling process, and the strength can be also increased.

关键词： TMCP fine grained ferrite plain low carbon steel plate mechanical property

Mechanical Properties of Steels Treated by Q-P-T Process Incorporating Carbide-free-bainite/martensite Multiphase Microstructure

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Journal of Iron and Steel Research International 2014年第2期21卷 191-196页

作者： Zhun-li TAN Kai-kai WANG Gu-hui GAO Xiao-lu GUI Bing-zhe BAI Yu-qing WENG Materials Science and Engineering Center Beijing Jiaotong University Key Laboratory of Advanced Materials School of Materials Science and EngineeringTsinghua University the chinese society for metals

Quenching partitioning tempering （QP-T） process were applied to a quenched carbide-free bainite/mar- tensite （CFB/M） multiphase steel 40Mn2Si2Cr and its effect on the mechanical properties was studied. The results showed that the partitioning time of Q P T treatment can he increased greatly to 90 min or even longer. The tensile strength, elongation and product of strength and elongation （PSE） of the experimental steel can achieve 1650 MPa, about 20% and over 33 GPa ·%, respectively. The significant increase of partitioning time and excellent mechanical properties could be related to the CFB microstrueture introduced in the quenching process during the Q-P-T treat- ment.

关键词： carbide-free bainite multiphase microstructure quenching partitioning-tempering partitioning time mechanical property

Interaction of Mechanical and Electrochemical Factors duringCorrosion Fatigue of Fe-26Cr-1Mo Stainless Steel in 1M H_2SO_4 Solution

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Journal of Materials Science & Technology 1995年第3期11卷 181-186页

作者： Jianqiu WANG Jin LI Ziyong ZHU and Wei KE (Corrosion Science Laboratory, Institute of Corrosion and Protection of metals chinese Academy of Sciences, Shenyang, 110015, China)Qishan ZANG and Zhongguang WANG (State Key Laboratory for Fatigue and Fracture Inst of Corrosion and Protection of Metals Chinese Acad of Sciences Shenyang China

The cyclic plastic straining electrode technique has been used to investigate the transient electrochemical behaviour of Fe-26Cr1Mo stainless steel in 1M H2SO4 solution at a passive *** influence of plastic strain amplitude and plastic strain rate on the dissolution current response was analysed. The experimental results showed that the transient current was dependent on the competitive process of the surface film rupture and repassivation of the new surface. The high plastic strain amplitude and the high plastic strain rate caused a change of electrochemical activity of specimen surface. In the condition of low strain amplitude and strain rate, the characteristics of current response was mainly relative tp the process of new surface *** competition kinetics has been analysed through the comparison of plastic strain rate and repassivating rate

关键词： Mo Cr Interaction of Mechanical and Electrochemical Factors duringCorrosion Fatigue of Fe-26Cr-1Mo Stainless Steel in 1M H2SO4 Solution Fe SO

Thermodynamic study and syntheses of β-SiAlON ceramics

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Science China(Technological Sciences) 2009年第11期52卷 3122-3127页

作者： DONG PengLi WANG XiDong ZHANG Mei GUO Min LI WenChao Department of Physical Chemistry University of Science and Technology BeijingBeijing 100083China chinese society for metals Beijing 100711China College of Engineering Peking UniversityBeijing 100871China

Based on the thermodynamic study of β-SiAlON and one section of Si-Al-O-N phase diagram for Si/Al=9 at 1773 K, the pure β-SiAlON (Si6-ZAlZOZN8-Z) ceramics with different Z values (viz. 1.4, 1.8, 2.2, 2.6, 3.0) were synthesized at different temperatures using the pressure-less technique. The relationship of the experimental-saturated Z value (the maximum Z value at a constant temperature) with temperature was then discussed. The experimental results indicated that there is a good linear relationship between Z value and temperature, which is Z=_10.76+0.0071T (R=0.9985). The β-SiAlON stability regions at different temperatures were exhibited in a sketch phase diagram of Si3N4-SiO2-Al2O3-AlN system. In addi- tion, the relationship between experimental-saturated Z value and the lattice parameters was also characterized, and the linear regression results a=7.604+0.02872Z and c=2.908+0.02496Z were obtained, respectively.

关键词： SiAlON thermodynamics synthesis oxynitride

Influence of Yttrium Implantation on Oxidation Behavior of Co-40Cr Alloy at 900℃

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Journal of Rare Earths 1999年第1期17卷 35-38页

作者：靳惠明李铁藩李美栓沈嘉年辛丽黄健宇 Inst of Corrosion and Protection of Metals Chinese Acad of Sciences Shenyang China

The oxidation behavior of Co 40Cr alloy with and without yttrium implantation was studied at 900 ℃ in the air. Scanning electron microscopy(SEM), secondary ion massive spectroscopy(SIMS), transmission electron microscopy(TEM) and high resolution electron microscopy(HREM) were used to study the forming mechanism of oxide film on the alloy. It is found that the binding energy of Cr on the alloy surface is decreased by yttrium implantation, thus the formation of protective Cr 2O 3 film on the substrate is accelerated. In the mean time, the binding energy of Cr inside the oxide scale is increased by yttrium implantation, and this would reduce the Cr 3+ cation diffusion through the film. Yttrium implantation decreases the grain size and the growing speed of oxide film. SIMS and TEM/HREM results show that some yttrium exists as small YCrO 3 particles at Cr 2O 3 grain boundary near the oxide/gas interface, and a few small Y 2O 3 particles exist near the substrate/oxide interface. Besides, yttrium may also segregate to Cr 2O 3 grain boundary as Y 3+ , reduce Cr 3+ cation diffusion and change the mechanical properties of the oxide film. The ability of anti oxidation of Co 40Cr alloy is greatly improved by yttrium implantation.

关键词： Rare earths Oxide film Binding energy Ion implantation

Mixed rare earth metal conversion coatings on 2024 alloy and Al6061/SiC_p metal matrix composites

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中国有色金属学会会刊：英文版 2000年第5期10卷 580-584页

作者：于兴文曹楚南 State Key Laboratory for Corrosion and Protection of metals Institute of Corrosion and Protection of Metals Chinese Academy of Science Shenyang 110015 China

The processes of mixed rare earth metal (REM) conversion coatings on 2024 alloy and Al6061/SiC p metal matrix composites (MMC) were introduced. The coatings were examined to be honeycomb like feature by scanning electron microscope. X ray diffraction analysis revealed that the coatings are amorphous structure. The results of X ray photoelectron spectroscopy indicated that the mixed REM conversion coatings consist predominantly of Ce and O, the contents of other rare earth elements (such as La, Pr) are relatively low, the coatings are about 2～4 μm thickness with excellent adhesion and wearability. The results of mass loss test showed that the mixed REM conversion coatings produce corrosion resistant surface of 2024 alloy and Al6061/SiC p. [

关键词： alloy Al6061/SiC p metal matrix composites mixed rare earth metal conversion coatings