氟化稀土对异种钢焊接接头抗裂性能的影响

本文研究了用高合金焊条焊接带耐蚀喷焊层低碳钢时稀土对异种钢焊接接头抗裂性能的影响,结果表明：在焊条药皮中加入适量稀土可以提高接头的抗裂性能,但是加入量过多又会产生不良影响。适量稀土的加入能够改善焊缝组织,使异种钢焊接接头热影响区变窄、过热区晶粒长大受到抑制、过渡区脆硬层硬度显著降低,有利于异种钢焊接接头抗裂性能的提高。     

Measurement of Residual Stress Field of Hardfacing Metal with RE Oxide and Its Numerical Simulation

The temperature and residual stress fields of a medium-high carbon steel, welded by a cracking resistance electrode with rare earth (RE) oxide, were measured by thermo-vision analyzer and X-ray stress analyzer respectively. Meanwhile, the martensitic transformation temperatures of matrix, hard-face welding (hardfacing) metal welded by conventional hardfacing electrode and that welded by cracking resistance electrode with RE oxide were determined. According to the experimental data and the thermo-physical, mechanical parameters of materials, finite element method (FEM) of temperature and stress fields was established. In this FEM, the effect of martensitic transformation on residual stress of hardfacing metal of medium-high carbon steel was taken into account. The results show that, by adding RE oxide in the coat of hardfacing electrode, the martensitic transformation temperature can be decreased, so that the residual tensile stress on the dangerous position can be decreased. Therefore, the cracking resistance of hardfacing metal can be improved.     

Effects of RE and N on Properties of Corrosion Resistance and Oxidation Resistance of Gray Cast Iron

ＩｔｉｓｗｅｌｋｎｏｗｎｔｈａｔｔｈｅｍｅｃｈａｎｉｃａｌｐｒｏｐｅｒｔｉｅｓｏｆｇｒａｙｃａｓｔｉｒｏｎｃａｎｂｅｉｍｐｒｏｖｅｄｂｙａｄｄｉｎｇｓｕｉｔａｂｌｅａｍｏｕｎｔｏｆＲＥａｎｄＮ．Ｔｏｈｉｇｈｃａｒｂｏｎｅｑｕｉｖａｌｅｎｔ（ＣＥ）ｇｒ...     

Study on Oxygen Isotope Fractionation in RE Oxide Minerals

ＳｔｕｄｙｏｎＯｘｙｇｅｎＩｓｏｔｏｐｅＦｒａｃｔｉｏｎａｔｉｏｎｉｎＲＥＯｘｉｄｅＭｉｎｅｒａｌｓＦａｎｇＴａｏ（方涛），ＱｉｕＹｕｚｈｕｏ（裘愉卓）（ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｃｈｅｍｉｓｔｒｙ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｇｕｉｙａｎｇ５...     

氧化膜对高温合金灰化抗力的影响

利用SEM和EDX研究比较了高铬、硅含量的高温合金,常用耐蚀合金Inco800H和In600以及304不锈钢在650℃、H2 CO合成气氛中的灰化损伤特征,发现高的铬含量和一定的硅含量可使高温合金表面快速形成致密的富铬氧化膜,以阻止石墨丝的形核和焦炭的生长,从而使高温合金在高的碳活度气氛中具有良好的金属灰化抗力。     

Effect of RE Oxide on Impact Toughness and Primary Structure of Surfacing Metal

ＥｆｅｃｔｏｆＲＥＯｘｉｄｅｏｎＩｍｐａｃｔＴｏｕｇｈｎｅｓａｎｄＰｒｉｍａｒｙＳｔｒｕｃｔｕｒｅｏｆＳｕｒｆａｃｉｎｇＭｅｔａｌＹａｎｇＱｉｎｇｘｉａｎｇ，ＷａｎｇＡｉｒｏｎｇ，ＬｉａｏＢｏ，ＹａｏＭｅｉ，ＱｉＪｕｎｊｉｅ①ＡＢＳＴＲＡＣＴＴｈｅｅ...     

RE 对 ZnAl4 合金组织和力学性能的影响

在ZnAl4合金中添加RE元素对其进行变质处理,通过金相组织和力学性能分析,研究了RE对该合金的显微组织和力学性能的影响。结果表明,基体中加入适量的稀土后,优化了组织结构,细化了晶粒,使合金的强度、硬度提10%以上,延伸率也有一定的提高。     

Effect of RE on Granulation of Eutectic Carbide in Ledeburite Steel

ＲｅｃｅｎｔｌｙｔｈｅｂｅｎｅｆｉｃｉａｌａｃｔｉｏｎｓｏｆＲＥｏｎｉｒｏｎａｎｄｓｔｅｅｌｓｈａｖｅｂｅｅｎｒｅｐｏｒｔｅｄａｒｏｕｎｄｔｈｅｗｏｒｌｄ．ＲＥｃａｎｎｏｔｏｎｌｙｄｅｏｘｉｄｉｚｅａｎｄｄｅｓｕｌｐｈｕｒｉｚｅｔｈｅｍｅｌｔａｎｄｆ...     

Thermodynamics of Modifying Effect of Rare Earth Oxide on Inclusions in Hardfacing Metal of Medium—High Carbon Steel

The modifying effect of rare earth(RE)oxide on inclusions in hardfacing metals of medium-high carbon steel was investigated by means of thermodynamics,The thermodynamic analsys for inclusion formation shows that RE oxide can be reduced to RE element by carbon,then the RE element can react with oxygen and sulfur to form the RE oxide,RE sulfide and RE oxide-sulfide in hardfacing molten pool.The deoxidization and the desulphurization can be carried otu and the liquid metal can be purified.In addition,RE oxide can also react with sulfur to form RE oxide-sulfide dirdctly.Therefore,the harmful effect of sulfur can be decreased.     

Mechanism of Cracking Resistance of Hardfacing Specimens of Steel 5CrNiMo Improved by Rare Earth Oxide

The cracking morphology of the hardfacing specimens taken from steel 5CrNiMo was observed. Meanwhile, the residual stress fields were measured and simulated. Based on experiment mentioned above, the improved structure and modified inclusion in hardfacing metal with rare earth （RE） oxide were analyzed. The results show that, the hardfacing crack is initiated from the coarse dendritic crystal grain boundary, inclusions and coarse austenite grain boundary in the HAZ and propagated by the residual stress existing in the center of the hardfacing metal and HAZ. The primary columnar grain structure can be refined by adding RE oxide in the coating of the electrode. The inclusion in the hardfacing metal can be modified as well. Meanwhile, if the martensite transformation temperature is decreased, the largest value of the residual tensile stress in the dangerous region can be reduced.     

Study on Structural Stability of RE/Fe Multilayers

ＳｔｕｄｙｏｎＳｔｒｕｃｔｕｒａｌＳｔａｂｉｌｉｔｙｏｆＲＥ／ＦｅＭｕｌｔｉｌａｙｅｒｓＬｉＳｈｅｎｇｌｉ（李胜利），ＷａｎｇＣｈａｎｇｚｈｅｎｇ（王长征），ＢａｏＷｅｎｌｉａｎｇ（鲍文良）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅ...     

Oxygen Isotope Fractionation of Common RE Fluorocarbonate

ＯｘｙｇｅｎＩｓｏｔｏｐｅＦｒａｃｔｉｏｎａｔｉｏｎｏｆＣｏｍｍｏｎＲＥＦｌｕｏｒｏｃａｒｂｏｎａｔｅＦａｎｇＴａｏ（方涛）（ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｃｈｅｍｉｓｔｒｙ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｇｕｉｙａｎｇ５５０００２，Ｃｈｉｎａ）Ｒｅ...     

Effect of Rare Earths on the Wear Resistance and High Temperature Oxidation Resistance of H13 Steel Surface-Treated with S-N-C Co-diffusion

ＳｔｅｅｌＨ１３ｉｓａｃｏｍｍｏｎｌｙｕｓｅｄｈｏｔｗｏｒｋｉｎｇｄｉｅｓｔｅｅｌ，ｗｈｉｃｈｃｈｅｍｉｃａｌｃｏｍｐｏｓｉｔｉｏｎｉｓｇｉｖｅｎａｓｆｏｌｏｗｓ：Ｃ：０３２～０４５，Ｓｉ：０８０～１２０，Ｍｎ：０２０～０５０，Ｃｒ：４...     

关于我国稀土三基色荧光粉与灯的问题

阐述了国内稀土三基色粉和灯当前的情景,并提出了要改进的意见。     

Study on RE-Modiffied Mordenite Catalysts for Amination Reaction

Ｉｎｏｒｄｅｒｔｏｉｍｐｒｏｖｅｔｈｅａｃｔｉｖｉｔｙａｎｄｓｅｌｅｃｔｉｖｉｔｙｔｏｄｉｍｅｔｈｙｌａｍｉｎｅ（ＤＭＡ）ｉｎａｍｉｎａｔｉｏｎｒｅａｃｔｉｏｎ，ｍａｎｙｒｅｓｅａｒｃｈｅｒｓｈａｖｅｄｏｎｅｍａｎｙｗｏｒｋｓｍａｉｎｌｙｏｎｔｈｅ...     

Effect of RE Modification and Heat Treatment on Impact Fatigue Property of a Wear Resistant White Cast Iron

Withhigherhardnessandbetterwearresistance ,whitecastironscanbeusedaswearresistantpartsinmanyfields .Inpractice ,thewearresistantpartsareoftenrequiredtobesubjectedtogrindingofabrasivesandrepeatedimpactaction .Therefore ,fatiguecracksareliabletobegeneratedo…     

Study on Y-Base Rare Earth Alloy in Ultra-High Hardfacing

The effect of Y-base rare earth alloy in ultra-high hardfacing was observed by means of OM, SEM and XRD. Precipitated carbide can be metamorphosed and spheroidized in surfacing by adding Y-base rare earth alloy, which contributes to the increase of precipitated carbide. Rare earth combined with oxygen and sulfur can improve the morphology of slag inclusion as well as purify surfacing. The result shows proper rare earth alloy in surfacing can fine its microstmcture, improve hardness and impact toughness.     

Study on Technology and Mechanism of Purifying Scandium Metal by Vacuum Distillation Method

Ｉｔｉｓｔｈｅｂａｓｉｃｍｅｔｈｏｄｔｏｐｒｏｄｕｃｅｈｉｇｈｐｕｒｉｔｙｓｃａｎｄｉｕｍｍｅｔａｌｔｏｐｕｒｉｆｙｔｈｅｒｏｕｇｈｓｃａｎｄｉｕｍｍａｄｅｆｒｏｍｃａｌｃｉｕｍｔｈｅｒｍａｌｒｅｄｕｃｔｉｏｎａｎｈｙｄｒｏｕｓｓｃａｎｄｉｕｍｆｌｕｏｒｉｄｅｂｙｖａｃｕｕｍｄｉｓｔｉｌｌａｔｉｏｎｍｅｔｈｏｄａｔｈｏｍｅａｎｄａｂｒｏａｄ．Ｐｒｅｖｉｏｕｓｓｔｕｄｉｅｓｓｈｏｗｔｈａｔｉｔｉｓｎｏｔｄｉｆｆｉｃｕｌｔｔｏｕｓｅｈｉｇｈｐｕｒｉｔｙｓｃａｎｄｉｕｍｏｘｉｄｅａｓｔｈｅｍａｔ…     

Effect of SiO2 introduction on luminescence properties of LuAG:Mn2+ phosphors

Mn²⁺doped LuAG phosphors with different contents of Si⁴⁺ions were synthesized via the solid-state reaction method and the effects of Si⁴⁺doping on the crystal structure and luminescence properties of phosphors were studied.XRD patterns of all phosphors exhibit a pure phase but with different extents of deviations.Owing to the 4 T1→6 A1 transition of Mn²⁺,the LuAG:Mn²⁺,Si⁴⁺phosphors exhibit a broad emission band with an emission peak at 582 nm.Moreover,the introduction of Si⁴⁺not only improves the emission intensity but also induces a red-shift with the emission peak from 582 to 612 nm and the spectra broadening with the full width at half maximum value from 64 to 74 nm,which results from the decrease of bond length between O2-anions and Mn²⁺cations and the re-absorption of Mn²⁺-Mn²⁺pairs.Suitable content of Si⁴⁺replacement can weaken thermal quenching of Mn²⁺.Thus,via regulating the content of Si,the Mn²⁺,Si⁴⁺co-doped LuAG phosphor with low correlated color temperature is a candidate for warm wLEDs.     

Types, Characteristics and Formation Mechanisms of Ion-adsorpted RE Deposits

Ｔｙｐｅｓ，ＣｈａｒａｃｔｅｒｉｓｔｉｃｓａｎｄＦｏｒｍａｔｉｏｎＭｅｃｈａｎｉｓｍｓｏｆＩｏｎ－ａｄｓｏｒｐｔｅｄＲＥＤｅｐｏｓｉｔｓ￥ＬｉｎＣｈｕａｎｘｉａｎ（林传仙），ＷａｎｇＹｉｘｉａｎ（王一先），ＱｉａｎＺｈｉｘｉｎ（钱志鑫），ＺｈｅｎｇＺ...