热处理对Ti-10V-2Fe-3Al合金相变化与性能的影响

对Ｔｉ－１０Ｖ－２Ｆｅ－３Ａｌ合金进行热处理研究,分析固溶时效过程中的相变化以及对性能的影响。结果表明,在Ｔｉ－１０Ｖ－２Ｆｅ－３Ａｌ合金可以通过热处理在在内调整性能。     

金基六元合金电接触材料的显微组织和性能研究

通过XRD、SEM、EDS等分析技术研究了铸态、加工态在不同热处理过程中,AuCuPtPdNiRh 合金的显微组织及物相变化.结果表明,该金基六元合金主要由以AuCu为基的固溶体和PtRh为基的固溶体,以及两者的混合固溶体组成;经不同的热处理过程后,固溶体中的溶质原子含量发生变化.金基六元合金经过500℃、100 mi...     

热处理对含硼奥氏体合金组织和性能的影响

结合X射线衍射(XRD)、能谱分析(EDS),研究热处理温度和冷却方式对一种自行开发的新型含硼耐液态锌腐蚀合金组织和性能的影响.结果表明,对该合金的热处理过程中,析出和溶入两个过程是同时进行的.热处理温度为980 ℃时,无论空冷还是水冷,合金中的元素在基体上均匀析出;热处理温度为1 030 ℃时合金中的元素析出和溶入达到动态平衡;热处理温度为1 150 ℃时,伴随铸态下晶界网状硼化物断开,硼及其合金元素对基体产生固溶强化.合金硬度随热处理温度的升高先降低后升高;冲击韧度则随温度升高而增加.     

Cu-Al-Mn合金热处理过程中的Mn挥发

通过对Cu-14.0wt%Al-7.5wt%Mn合金样品在900℃真空环境下进行不同时间的退火热处理后,利用化学成分分析、扫描电镜、金相显微镜观察以及x射线衍射分析等方法对该合金进行了微观组织结构分析,对其进行了硬度测量,并利用测量低温电阻的方法测量了样品的马氏体相变温度.结果表明,随着热处理时间的延长,合金中的Mn挥发的越多,从而使合金的马氏体相变点有所升高.因此,可以通过掌握热处理过程中Mn的挥发规律,进而控制Cu-Al-Mn合金中Mn的含量,以准确调节该合金马氏体相变温度.     

镁合金的热处理

介绍了镁合金的热处理类型,综述了不同镁合金系合金化和热处理时的显微组织特点,以及合金元素对时效析出过程及合金性能的影响。最后提出了镁合金热处理未来的研究和发展方向。     

ZA84镁合金在半固态等温热处理过程中的组织演变

研究了ZA84镁合金在半固态等温热处理过程中的组织演变.研究结果表明,通过半固态等温热处理制备非枝晶组织ZA84合金是可能的.当ZA84合金经570℃×120 min半固态等温热处理后,可获得液相率为22%和未熔初生相颗粒尺寸为57um的非枝晶组织.ZA84合金在半固态等温热处理过程中的组织演变主要包括最初的粗化、组织分离和球化3个阶段.没有发现球状晶粒最后的粗化.     

热处理制度对GH2132合金组织性能的影响

研究了不同热处理制度对GH2132合金组织和性能的影响。采用Thermo-Calc软件对GH2132合金中析出的平衡相进行热力学模拟,以及电子显微镜观察热处理前后合金中微观形貌以及相。结果表明,热处理过程中时效温度对合金中γ'相的析出及分布具有重要影响,固溶处理可以调整合金的晶粒尺寸。随时效温度升高,合金中主要强化相γ'相尺寸及数量均增加,从而增加了合金的抗拉强度和屈服强度。     

热处理对Mg-9Gd-2Y-0.6Zr合金显微组织和耐蚀性的影响

采用失重法、扫描电子显微镜、光学显微镜研究了热处理对Mg-9Gd-2Y-0.6Zr合金显微组织和耐蚀性的影响。结果表明:合金铸态组织由α-Mg基体和粗大的枝晶β相组成,热处理后,合金中的β相经过溶解再析出的过程,β相由断续网状转变为方块颗粒状;热处理工艺显著提高了合金在Hanks模型中的耐蚀性,且腐蚀产物以Mg(OH)2为主。     

热处理对Nb-1Zr-C系铌合金焊接接头性能的影响

资料指出,Nb-1Zr-C 系铌合金在800—1000℃温度区间有时效趋向。过饱和固溶体分解过程析出铌和锆的碳化物相以及铌的氧化相。这类合金焊接接头中的固溶体在焊后冷却过程直接进行分解。侭本文研究了热处理规范对 Nb-1Zr-C 系合金焊缝金属性能的影响。合金的化学成份列于表1     

热处理对挤压态Mg-Er合金组织和性能的影响

对挤压态Mg-6.2 mass%Er合金在静态再结晶热处理过程中组织、织构的演变以及相应的力学行为进行了表征,分析了影响该合金塑性变形的微观机制。结果表明,挤压态Mg-6.2 mass%Er合金为部分再结晶的形变组织。在热处理过程中,再结晶程度与退火温度有关,在500℃下退火热处理获得完全再结晶组织。随着再结晶程度的提高,基面织构出现明显的弱化。合金室温拉伸塑性取决于织构的类型,基面织构的弱化导致合金室温塑性大幅度提高。     

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.