检索结果-南通市图书馆

Comprehensive evaluation of chemical breakers for multistage network ultra-high strength gel

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2023年第5期20卷 2864-2878页

作者： Zheng Kang Hu Jia Zhong-Guo Li Biao Xia Yi Wang Yong Jiang Han-Lin Peng Petroleum Engineering Technology Institute of Southwest Petroleum Branch SINOPECDeyang618000SichuanChina National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation of Southwest Petroleum University Chengdu610500SichuanChina SINOPEC Southwest Petroleum Engineering Company Deyang618000SichuanChina

Polymer gels have been accepted as a useful tool to address many sealing operations such as drilling and completion,well stimulation,wellbore integrity,water and gas shutoff,***,we developed an ultra-high strength gel(USGel)for medium to ultra-low temperature ***,the removal of USGel is a difficult problem for most temporary plugging *** paper first provides new insights into the mechanism of USGel,where multistage network structure and physical entanglement are the main reasons for USGel possessing ultra-high *** the effects of acid breakers,encapsulated breakers,and oxidation breakers(including H_(2)O_(2),Na_(2)S_(2)O_(8),Ca(ClO)_(2),H_(2)O_(2)+NaOH,Na_(2)S_(2)O_(8)+NaOH,and Ca(ClO)_(2)+NaOH)were *** effects of component concentration and temperature on the breaking solution were studied,and the corrosion performance,physical simulation and formation damage tests of the breaking solution were carried *** final formulation of 2%-4%NaOH+4.5%-6%H_(2)O_(2) breaking solution was determined,which can make USGel completely turn into water at 35e105*** combinations of“acid t breaking solution”,“acid+encapsulated breaker”and“encapsulated breaker+breaking solution”were evaluated for breaking *** acid gradually reduced the volume of USGel,which increased the contact area between breaking solution and USGel,and the effect of“4%acid+breaking solution”was 23 times higher than that of breaking solution alone at 35***,the acid significantly reduced the strength of *** paper provides new insights into the breaking of high-strength gels with complex network structures.

关键词： Gel breaking Polymer gel ultra-high strength Chemical breakers Multistage network

ultra-high strength Concrete Mixtures Using Local Materials

在线全文

学校读者我要写书评

暂无评论

Journal of Civil Engineering and Architecture 2011年第4期5卷 322-330页

作者： Srinivas Allena Craig M. Newtson Civil and Environmental Engineering Department Washington State University Tri-Cities Richland WA 99354 USA Civil Engineering Department New Mexico State University Las Cruces NM 88003 USA

This paper presents the development of ultra high strength concrete （UHSC） using local materials. UHSC mixture proportions were developed using local materials so that UHSC may be made more affordable to a wider variety of applications. Specifically, local sand with a top size of 600 um, and locally available Type I/II cement and silica fume were used in this research. Each of these material selections is seen as an improvement in sustainability for UHSC. Two mixtures （one with and one without fibers） were recommended as the UHSC mixtures. The greatest compressive strengths obtained in this study were 165.6 MPa for UHSC with steel fibers and 161.9 MPa for UHSC without fibers. The compressive and flexural strengths obtained from the UHSC mixtures developed in this work are comparable to UHSC strengths presented in the literature. Producing this innovative material with local materials reduces the cost of the material, improves sustainability, and produces mechanical performance similar to prepackaged, commercially available products.

关键词： Compressive strength local materials modulus of rupture sustainability ultra-high strength

Preliminary Research on a New ultra-high strength Titanium Alloy

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

Preliminary Research on a New Ultra-high Strength Titanium A...

2.47 GPa grade ultra-strong 15Co-12Ni secondary hardening steel with superior ductility and fracture toughness

中国材料大会2012

作者： Henglei Qu Yongqing Zhao Zhishou Zhu Hui Li Liang Feng Lian Zhou Mingqiang Li WMM-NIN No. 15 xijin road Xi'an 710201 China BIAM P.O. Box 81 Beijing 100095 China

ISBN: (纸本)9783037856086;3037856084

Some research results are introduced briefly in this paper. A new kind of titanium alloy was designed based on nine elements system, which belongs to ( α+ β) type. Bars with diameter of 14 mm were produced via Vacuum Arc Remelting (VAR) melting and conventional forging and rolling facilities. Influence of alloy elements’ contents and heat treatments on microstructure and mechanical properties of the new alloy were studied. The results show that Ultimate Tensile strength (UTS) is about 1200700MPa and Elongation (EL) is normally less than 5% at R.T., though Electron Beam (EB) welding can be proceeded, but the toughness of the alloy is poor at *** temperature (HT) short-term strength of the alloy is also acceptable up to 600℃. Based on the above performances, the new material can be applied in the corresponding circumstances.

关键词： Titanium alloy ultra-high strength Metallographic microstructure Mechanical properties.

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 2021年第7期66卷 36-45页

作者： Young-Kyun Kim Kyu-Sik Kim Young-Beum Song Jung Hyo Park Kee-Ahn Lee Department of Materials Science and Engineering Inha UniversityIncheon22212Republic of Korea Agency for Defense Development(ADD) Yuseong-guDaegeon34186Republic of Korea

This study investigated the effect of multi-step heat treatment on the microstructure, mechanical properties and fracture behavior of thick 15 Co-12 Ni secondary hardening steel. As-quenched sample was found to have elongated prior austenite grain(PAG) and coarse lenticular martensitic structure. On the other hand, heat-treated sample was observed to have fine lenticular martensitic structure due to fine PAG size and a lot of nano-sized carbides. Also, after heat treatment, nano-scale reverted austenite film was formed at the martensite interfaces. The heat-treated sample showed 2.47 GPa superior tensile strength and superior elongation of about 12 %. The high strength was mainly due to fine block size and high number density of nano-sized carbides. The average value of plane strain fracture toughness(KIC) was 29.3 MPa m1/2, which indicated a good fracture toughness even with the high tensile strength. The tensile fracture surface was observed to have ductile fracture mode(cup-and-cone) and the formation of about ~1 μm ultra-fine dimples. In addition to this, nano-sized carbides were observed within the *** findings suggested that the nano-sized carbide had a positive effect not only on the strength but also on the ductility of the alloy. The fractured surface after toughness test, also showed ductile fracture mode with a lot of dimples. Based on the above results, correlation among microstructural evolution,deformation and fracture mechanisms along the heat-treatment was also discussed.

关键词： ultra-high strength high Co-Ni secondary hardening steel Microstructure Tensile properties Fracture toughness Reverted austenite

Development and Production of X120 Strip With Excellent Toughness in Shougang 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 908-914页

作者： ZHANG Yong-qing 1,LI Ming 2,LI Yong-dong 1,JIN Wei 2,ZHU Guo-sen 1,LI Yan-feng 3,TIAN Peng 3,WANG Quan-li 1,WU Xin-lang 2,WANG Xue-qiang 2 (1.Shougang Research Institute of Techonolgy,Beijing,China 2.Qian’an Iron and Steel Company of Shougang Group,Hebei Province,China 3.North China Petroleum Steel Pipe Co.,Ltd) Shougang Res Inst Techonolgy Beijing Peoples R China Qianan Iron & Steel Co Shougang Grp Qianan Hebei Province Peoples R China N China Petr Steel Pipe Co Ltd Shouguang City Shandong Peoples R China

In this paper,the product designs,mechanical properties and microstructure of ultra-high strength linepipe steel in grade X120 strip with a thickness of 16mm have been shown and analyzed *** tensile test results with different directions,including transverse,longitudinal and 30° to the rolling direction,showed that the yield strength and ultimate tensile strength reach and exceed 900MPa and 1000MPa respectively,which are far higher than requirements of X120,such as 827MPa and *** the other hand,as shown from the test results of Charpy impact tests at different temperatures from 20 ℃ to-60 ℃,the absorbed energies and fracture shear area at-60℃ are about 200J and 100% respectively,which is very exciting and *** order to clarify the strengthening mechanism and effect of X120 strip further,microstructure has been observed through *** of the metallography revealedthat the microstructure was composed of lower bainitewith a size of 1um and fine M/A *** X120 strip was formed into 1420 mm diameter spiral welded pipe in Huabei pipe *** results showed that ultra-high strength and high toughness linepipe could be achieved through reasonable alloy composition design and optimized rolling processes.

关键词： linepipe steel ultra-high strength excellent toughness ultra-fined bainite X120

Influence of Mo on Dynamic Continuous Cooling Transformation of 1000 MPa Cold Rolled Dual Phase 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 296-299页

作者： ZHAO Xian-meng,KANG Yong-lin,HAN Qi-hang (School of Material Science and Engineering.University of Science and Technology Beijing,Beijing 100083,China) Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China

The expanding curves of two kinds of 1000 MPa ultra-high strength cold rolled dual phase steels,which were C-Si-Mn-Cr and C-Si-Mn-Cr-Mo steel respectively,were detected on Gleeble-1500 thermal-mechanical simulator at different cooling *** with metallographic and hardness methods,the continuous cooling transformation curves (CCT) of the two steels were *** results showed that Mo could raise the A r3 temperature,and strongly restrain the pearlite and bainite *** reason for this was the interaction that the addition of Mo could increase the chemical driving force of ferrite transformation and the activation energy for the diffusion of carbon in austenite,which could decelerate the ferrite *** hardness of the two steels was similar in the cooling rates range of this experiment and got higher with the increase of the cooling *** the cooling rates were above 7 ℃/s,the hardness almost kept constant because the most part of the microstructure was martensite.

关键词： Mo dual phase steel cold rolled CCT ultra-high strength