纯镍焊芯材料性能研究

纯镍焊芯材料具有强度高,特别是高温强度较高,而且耐腐蚀和高温抗氧化性能优良,适宜制造特殊用途的焊条。在试验基础上研制了纯镍焊芯材料,其性能达到国外同类产品的水平,满足了国内对焊芯材料的需要。     

光伏产业多晶硅设备配套焊材E2133Mn性能研究

N08810合金为多晶硅设备主要用母材,研制了与其匹配的焊材——E2133Mn焊条,并对其熔敷金属进行室温拉伸、600℃高温拉伸、G28-A法腐蚀等试验,证明了熔敷金属具有优良的机械性能及耐腐蚀性能。为验证E2133Mn焊条与母材的匹配性,采用该焊条进行N08810钢对接焊,并对其接头性能进行深度试验。经X射线探伤和面弯试验,表明接头未产生焊接缺陷,具有良好韧性。E2133Mn所有接头拉伸试验断裂位置均为母材,X型坡口上中下三层强度数据无明显区别,焊态强度达到560 MPa,经稳定化处理后强度提升到620 MPa,高温拉伸强度虽有明显下降,但优于母材,同样满足设计要求。试验结果表明,E2133Mn焊条与N08810钢匹配性优秀,焊缝及热影响区室温及高温强度全面优于母材,接头性能完全符合实际工程需求,为多晶硅设备装配制造提供了理论参考。     

9%Cr马氏体耐热钢C9MVW和5Co1焊条的研制

9%Cr马氏体耐热钢由于其优异的抗蠕变断裂性能,大量应用于火力发电汽轮机、锅炉及管道等设备的关键部位。C9MVW焊条及5Co1焊条是为匹配不同成分的母材,在9%Cr钢成分基础上分别添加适量的钨(W)元素及钴(Co)元素,以提高材料的抗高温蠕变性能及高温耐磨性能。两种焊条在全位置焊接时都具有良好的焊接性,且化学成分、力学性能及扩散氢含量均满足指标设计要求,高温持久强度经过专业机构测定均满足应用要求。     

高性能耐火耐候焊接材料的研制及应用

详细介绍了高性能耐火耐候建筑用钢WGJ510C2钢、配套焊条CJ556N和埋弧焊丝CJ.GNH-1/CHF101熔敷金属的化学成分和性能要求。通过分析焊接接头的力学性能和金相组织,进行冲击试验、硬度试验、高温拉伸试验和电化学腐蚀试验,结果表明,所配焊条CJ556N、埋弧焊丝CJ.GNH-1焊接性能良好,接头强度均高于母材,冷弯性能、低温韧性和高温性能优良,满足匹配技术条件。     

抗高温氧化腐蚀专用焊条

通过A402，A302，A202及Cr24Ni7不锈钢焊条熔敷金属的抗高温氧化腐蚀性能对比试验分析，设计了新的专用焊条合金系统Cr26Nil6，并在焊条药皮中分别添加微量稀土氧化物La2O3及CeO2，研究不同稀土氧化物添加量对焊条熔敷金属在空气中和含硫气氛中抗高温氧化及腐蚀性能的影响，从而确定了合理的稀土氧化物加入量。最后，对合金系统为Cr26Nil6的专用焊条进行工艺评价。结果表明，专用焊条工艺性好，用该焊条所焊焊缝的性能可满足抗高温氧化腐蚀使用要求。微量稀土氧化物在焊条药皮中的加入，对其熔敷金属的抗高温氧化性能有所提高，对在含硫气氛中的抗高温腐蚀性能有显著提高；加入La2O3的焊条熔敷金属比加入CeO2的焊条熔敷金属抗高温氧化及硫化腐蚀性能更好。     

奥氏体耐热不锈钢S30815的焊接工艺研究

S30815钢是具有优异的高温抗氧化性、高温强度及高温耐腐蚀性的奥氏体耐热不锈钢。通过分析其化学成分和组织,发现其焊接性能较好,热裂纹敏感性不大。选择国产CHS102Si N焊条进行焊接工艺试验,所获得接头的力学性能符合技术要求,证明其焊接工艺是可行的。     

镍基焊条JWENiCrMo-3的研制

研发了一种适用于镍基合金焊接的镍基焊条。选用CaO-CaF_2-TiO_2渣系作为焊条药皮的矿物粉体系,探究了药皮各矿物粉组成对焊条焊接性能的影响,评定了焊条熔敷金属力学性能、抗裂性能、抗高温氧化性能,并与市售焊条进行了综合对比。结果表明,该焊条施焊时,飞溅小、易脱渣、焊缝纹路均匀,抗热裂纹性能佳,熔敷金属综合性能优良。     

Cr-Mo系低合金钢焊条

1发明概述 提供一种满足9％Cr低合金钢焊接时具有高温强度和良好韧性熔敷金属的焊条。     

镍基高温耐磨无渣堆焊焊条及其热处理工艺

针对镍基合金具有优良的高温综合性能,且目前市场上几乎没有这类手工电弧堆焊材料等实际情况,研制开发了一种抗高温耐磨损的镍基无渣堆焊焊条.该焊条具有焊接烟尘小,烟尘中含对人体有害气体极少;焊后焊道上几乎没有熔渣,连续多层焊无需敲渣;价格便宜(与钴基合金相比),高温(650℃左右)性能优良等特点.此外,该焊条由于熔敷金属中含合金元素量较一般堆焊焊条的熔敷金属多,成分复杂,焊后焊缝中存在的内应力较大,且焊缝在快速冷却条件下产生的组织不稳定,从而影响到熔敷金属的综合性能.为了能更好地推广和更合理地应用这种高温无渣耐磨堆焊焊条,对其熔敷金属的热处理工艺也进行了初步探讨.     

高温耐磨无渣堆焊焊条的研制

针对镍基合金具有优良的高温综合性能，且目前市场上几乎没有这类焊条电孤堆焊材抖等实际情况，开发研制了一种抗高温耐磨损的镍基无渣堆焊焊条。该焊条具有焊接烟尘小，烟尘中含对人体有害气体极少；焊后焊道上几乎没有熔渣，连续多层焊无需敲渣：价格低廉(与钴基合金相比)，高温(650℃左右)性能优良等特点。谊焊条的成功研制改善了工作环境、提高了工作效率、较好地满足了实际生产需要。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

The Mirror with Patterns of Auspicious Animals and Grapes——Exquisite cast mirror and the technology of surface tin-enrichment by rubbing-in and infiltration of tin-rich powder

<正>Bronze mirrors were used by the Chinese people before the introduction of the glass mirror.Only after it was replaced by the glass mirror did the bronze mirror gradually retreat from people's lives.Different styles of bronze mirrors were made in different historical periods,particularly in the Warring States Period,the Han and Tang Dynasties,which were the three peaks of the development of bronze mirror arts in ancient China.The casting techniques were exquisite.The surface of the bronze mirror was smooth and bright enough to reflect one's image,and there were scarcely any casting defects on the mirror surface.On the back of the bronze mirror,there were rich depictions of Arts and Humanities,and the ornamentations were also     

The 9th China International Diecasting Congress & Exhibition

The 9th China International Diecasting Congress ＆ Exhibition was held on July 22-24, 2014 at Shanghai New International Expc Centre. This exhibition was the most successful over the years, with over 6890 visitors and 155 exhibitors, and the exhibition area increased by 30% from 9,500 square meters in 2012 to 12340 square meters. Die casting enterprises from a total of 24 countries and regions, including China mainland, Chinese Taiwan and Hong Kong, South Korea, Japan, Germany, India, Thailand, Malaysia, the United States, Russia, Australia, Iran, Ukraine, Brazil, Colombia, Singapore, Austria, Canada, Croatia, France, Turkey, United Kingdom, Vietnam, attended the congress and exhibition.     

Introduction of the Fluid Control Engineering Institute of Kunming University of Science and Technology

正The Fluid Control Engineering Institute of Kunming University of Science and Technology was set up in 1996.The researches of institute concentrate on electro-hydraulic(pneumatic)servo/proportional control and hydromechatronics.The Institute is committed to research and development of electro-hydraulic control of high-end technical equipment in ferrous metallurgy refining produc-     

RARE METALS Volume Contents

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Antimony Induced Crystallization of Amorphous Silicon

Antimony induced crystallization of PVD (physics vapor deposition) amorphous silicon can be observed on sapphire substrates. Very large crystalline regions up to several tens of micrometers can be formed. The Si diffraction patterns of the area of crystallization can be observed with TEM (transmission electron microscopy). Only a few and much smaller crystals of the order of 1μm were formed when the antimony layer was deposited by MBE (molecular beam epitaxy) compared with a layer formed by thermal evaporation. The use of high vacuum is essential in order to observe any Sb induced crystallization at all. In addition it is necessary to take measures to limit the evaporation of the antimony.     

A CUMULATIVE FATIGUE DAMAGE RULE UNDER THE ALTERNATIVE OF CORROSION OR CYCLIC LOADING

Fatigue damage increases with the applied loading cycles in a cumulative manner and the material deteriorates with the corrosion time. A cumulative fatigue damage rule under the alternative of corrosion or cyclic loading was proposed. The specimens of aluminum alloy LY12-CZ soaked in corrosive liquid for different times were tested under the constant amplitude cyclic loading to obtain S-N curves. The test was carried out to verify the proposed cumulative fatigue damage rule under the different combinations among corrosion time, loading level, and the cycle numbers. It was shown that the predicted residual fatigue lives showed a good agreement with the experimental results and the proposed rule was simple and can be easily adopted.