检索结果-南通市图书馆

research on Alloying Design and Process Control for X100 Hot-Rolled Strips

在线全文

学校读者我要写书评

暂无评论

Journal of iron and steel research International 2011年第S1期18卷 675-680页

作者： JIA Shu-jun 1,LIU Qing-you 1,PENG Ling-li 1,QU Peng 2 (1.china iron and steel research institute Group,Beijing 100081,china 2.Benxi steel Group Corporation,Benxi 100083,Liaoning,china) china iron & steel res inst grp Beijing 100081 Peoples R China Benxi steel grp Corp Benxi 100083 Liaoning Peoples R China

The influence of alloying design,controlled rolling technology and cooling system of X100 hot-rolled strips on microstructure and micro-hardness has been discussed in detail in this *** results show that optimal chemical composition range of X100 hot-rolled strips is obtained on the basis of X80 by increasing contents of C,Mn,Ni and Mo of *** granular bainite microstructure could be refined and the volume fraction and size of M-A islands could be controlled in a reasonable range by reasonably regulating cooling rate and coiling temperature of X100 pipeline steel,which ensure high strength and toughness of X100 pipeline steel.

关键词： alloying design deformation cooling rate final cooling temperature granular bainite

Effect of Aluminum and Titanium Treatment on Non-Metallic Inclusions and Microstructures of CGHAZ in HSLA 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 2011年第S1期18卷 360-365页

作者： CHAI Feng,YANG Cai-fu,SU Hang,ZHANG Yong-quan,ZHANG Dan-dan (china iron and steel research institute,Beijing 100081,china) china iron & steel res inst Beijing 100081 Peoples R China

The Effect of A1 and Ti treatment on non-metallic inclusions and microstructures of coarse-grain HAZ in HSLA stee1 was investigated in this paper based on experiments and thermodynamic *** results showed that the inclusions in A1 treated steel were mainly aluminum oxides and titanium nitrides which could not promote the formation of acicular ferrite *** of coarse-grain HAZ in A1 treated steels consists of heavy grain boundary ferrite and ferrite side *** inclusions in Ti treated steel were A1,Ti,Mg,Ca composite oxides with size in the range of 0.5-3μm and titanium nitrides with size less than 0.3μ*** composite oxide could promote the formation of acicular ferrite and microstructures of coarse-grain HAZ in Ti treated steel consists of grain boundary ferrite,small amounts of ferrite side plate and large amounts of intragranular acicular *** size of grain boundaries ferrite was increased and the amount of ferrite side plate was decreased with the increase of soaking time at the peak *** amount of grain boundary ferrite and the size of acicular ferrite were also increased with the increase of cooling rate during ferrite phase formation.

关键词： Ti treatment A1 treatment coarse grain HAZ grain boundary ferrite acicular ferrite

Influence of Rare Earths on Contact Fatigue of Rail steels

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2000年第2期18卷 136-139页

作者：马腾朱桂兰 Cent iron & steel res inst Dept Phys Beijing 100081 Peoples R China

Rail/wheel contact fatigue of NbRE rail, Nb rail and U74 rail was investigated using contact fatigue tester. Microstructure and morphology as well as microhardness in the fatigue profiles were analyzed by scanning electron microscope and Vickers hardness respectively. The experimental results show that rare earths are able to delay the initiation and the propagation of fatigue cracks and postpone the surface shelling or spalling, even more, to reduce the crack propagation angle and the crack propagation depth in steady stab as well as the plastic deformation area, and to improve work-hardening of the rail steel.

关键词： rare earths rail steel contact fatigue plastic deformation work hardening

Investigation of Corrosion resistance Using Positron Annihilation for an Amorphous Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2001年第4期17卷 482-484页

作者： Jingcheng WANG, Fuqiang YOU,Junlin YIN and Guohua GAO Testing Center, Shanghai iron & steel research institute, Shanghai Bao steel Group Corporation, Shanghai City Key Laboratory of Metal Functional Materials, Shanghai 200940, china Shanghai Bao steel grp Corp Testing Ctr Shanghai Iron & Steel Res Inst Shanghai City Key Lab Met Funct Mat Shanghai 200940 Peoples R China

An amorphous alloy with Ni-(17-19) at. pct P prepared by electrodeposition process was studied using positron annihilation technique (PAT) associated with X-ray diffraction and the measurement of corrosion rate. It is suggested that defect or the interface between precipitates and matrix is one of the important factors which decrease corrosion resistance of the alloy after crystallization.

关键词： Nickel alloys

Effect of Zirconium on Tensile Property,Microstructure and Fracture Behaviour of Cast Ni_(3)Al Based Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of iron and steel research International 1997年第1期4卷 37-41页

作者： Ye Wujun, Feng Di, Han Guangwei, Luo Heli Central iron and steel research institute, MMI, Beijing (100081), china Cent iron & steel res inst MMI Beijing 100081 Peoples R China

The effect of Zr on tensile property, microstructure and fracture behaviour of cast Ni 3Al based alloy strengthened with carbides has been studied. It was found that Zr distributes at interdendrites and grain boundaries in the form of ZrC particle and Ni 5Zr eutectic phase which can refine microstructure. Ni 5Zr phase can alleviate the crack initiation at grain boundaries and dendrite boundaries, which helps deformation to be harmonical between matrix and precipitates at elevated temperature.

关键词： Ni 3Al alloy tensile property fracture behaviour microstructure

同方期刊数据库

More Discussion on High Efficiency & Low Cost Clean steel Production Platform

在线全文

学校读者我要写书评

暂无评论

Journal of iron and steel research International 2011年第S2期18卷 1-8页

作者： YIN Rui-yu (Central iron and steel research institute, Beijing, 100081) Cent iron & steel res inst Beijing 100081 Peoples R China

The construction of high efficiency, low cost clean steel platform is one of the common key technologies concerning efficiency, quality and cost. It is basic and universal and not only applicable in the R&D and production of "high-end" products, but also in the production of bulk ordinary steel products. The platform of high efficiency, low cost clean steel is the important direction of modern steel technology progress and has great significance on the competitiveness of each steel plant. The research of high efficiency, low cost platform not only involves the production and management of the steel plant, but also the academic research field (process engineering and dynamic operation) and theories and methods innovation of engineering design (theory and method of dynamic-precision design). The integrated theory and method of high efficiency and low cost clean steel platform is the binding point of metallurgical process engineering and material engineering. Different types of high efficiency, low cost clean steel platform should combine with the corresponding rolling process and iron making process so that high efficiency, low cost clean steel manufacturing system would come into being.

关键词： more discussion high efficiency & low cost clean steel platform integration technology

Surface Adsorption of Si_3N_4 Ultrafine Powder at Room Temperature

在线全文

学校读者我要写书评

暂无评论

Journal of iron and steel research International 1997年第1期4卷 52-55页

作者： Ai Xingtao, Chen MinghaoCentral iron and steel research institute, MMI, Beijing (100081), china Cent iron & steel res inst MMI Beijing 100081 Peoples R China

In this paper, Pyrolysis Gas Chromatography Mass Spectroscopy is adopted to measure heating release curve of Si 3N 4 ultrafine powder at different temperatures. The results demonstrate that Si 3N 4 mainly adsorbs O 2, N 2, CO 2, NH 3 and H 2O during the storage at room temperature, of which O 2 and N 2 are physisorped and H 2O chemisorped. Hydrolysis reaction is the reason for oxygen increasement and the different states of oxygen can be determined by improved heat extraction. The mechanisms of the reaction speed as well as the formation of different states of oxygen are also discussed.

关键词： Si 3N 4 ultrafine powder adsorption hydrolysis

同方期刊数据库

Recent Development and Applications of V Microalloying Technology in china

在线全文

学校读者我要写书评

暂无评论

Journal of iron and steel research International 2011年第S1期18卷 836-842页

作者： YANG Cai-fu,SU Hang,CHAI Feng,PAN Tao,ZHANG Yong-quan (Central iron and steel research institute,Beijing 100081,china) Cent iron & steel res inst Beijing 100081 Peoples R China

This paper reviews recent developments of V microalloying technology and its applications in HSLA ***-nitrogen in V-containing steel promotes precipitation of fine V(C,N) particles,and improves markedly precipitation strengthening effectiveness of vanadium,therefore,there is a significant saving of V addition in the same strength *** can be used effectively for ferrite grain refinement by the nucleation of intragranular ferrite promoted by VN precipitates in *** combination of intragranular ferrite (IGF) on VN particles and the recrystallization controlled rolling (RCR) technology realize the grain refinement in V-containing steel.V-N process is a cost-effective way for high strength rebars,forging steels and thin slab direct rolling strips.

关键词： V microalloying precipitation strengthening intragranular ferrite recrystallization controlled rolling

Study of Origin of Shape Memory Effect for TiNi Alloy byPositron Annihilation

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1998年第4期14卷 368-370页

作者： Wang, JC You, FQ Qi, JL Tang, XF Shanghai iron & steel res inst Shanghai Key Lab Met Funct Mat Shanghai 200940 Peoples R China Shanghai iron & steel res inst Res Ctr Shanghai 200940 Peoples R China Tongji Univ Dept Phys Shanghai 200092 Peoples R China

A number of specimens of Ti-51Ni (at. pet) alloy showing reversible shape memory effect (RSME) have been measured as to reversibility and S-lineshape parameter of positron annihilation. It is found that the Ti-51Ni specimens showing good memory effect contain structural defects. Not all specimens including structural defects (or structural imperfection) are able to exhibit good memory effect. The structural defects have to be appropriate in density, neither too much nor too little. With no or too much structural defects a good RSME could not take place. It is fully as important that the structural defects exist as it is for the structural defects to be appropriate in density in order to obtain a good RSME.

关键词： Titanium alloys