Giant Stress-Impedance Effect in Co71.8Fe4.9Nb0.8Si7.5B15 Glass-Covered Amorphous Wires

The giant stress-impedance （GSI） effect in as-cast and DC current annealed Co71.8Fe4.9 Nb0.8Si7.5 B15 amorphous glass-covered wires is presented. The SI ratio of the as-cast sample exhibits negative GSI effect. For the sample annealed by 60 mA DC current, the SI ratio first increases with applied tensile stress, then decreases. The maximum ΔZ/Z ratio of 304% is obtained. Frequency dependence in the range from 1 to 110 MHz of the GSI effect is investigated. Experimental results show that the real part R and the imaginary part X of impedance play an important role at high frequency and low frequency, respectively. At 1 MHz, the maximum AX/X ratio of 1448% is obtained. At 110 MHz, the maximum AR/R ratio of 648% is obtained.     

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On industrial scale, high strength P- containing IF (Interstitial Free) steels were produced with both batch annealing and continuous annealing processes and their microstructures and properties were studied. Forming abilities of the two steels were compared with commercial Al- killed steel DC01 and extreme deep drawing IF steel DC04 produced with batch annealing. The results show that the microstructures of high strength IF steels are composed of equi- axial ferrite and their mechanical properties meet the requirement of relevant standard. The batch annealed high strength P- containing steels show poorer formability than continuous annealed ones. The test results of texture and orientation distribution function (ODF) demonstrate that density of ??- fiber increases in order of batch annealed high strength P- containing IF steel, commercial DC01, continuous annealed high strength P- containing IF steel and normal IF steel DC04.     

逆相变退火对连铸坯组织和力学性能的影响

 研究了逆相变退火温度对0.1C5Mn钢连铸坯的组织结构和力学性能的影响规律,采用SEM进行组织结构的表征,利用XRD技术分析连铸坯退火后奥氏体含量,并测试了退火试样的力学拉伸性能。试验结果表明,连铸坯退火过程中发生奥氏体逆转变且在较低退火温度下有少量碳化物析出,随着退火温度升高,奥氏体含量先增加后减少,析出物逐渐溶解消失。提高退火温度可以显著提高试验钢的抗拉强度但却降低它的屈服强度,另外随退火温度升高,断后伸长率和强塑积先增高后降低。在625~650℃退火,可以获得20%~25%的伸长率。研究结果说明利用逆转变退火可以大幅度提高中锰钢铸坯的力学性能。     

电流退火对铁基非晶合金Fe78Si9B13薄带巨应力阻抗效应的影响

研究了电流退火工艺对非晶Fe78Si9B13薄带巨应力阻抗效应的影响.实验结果表明,在外加应力下对非晶合金进行电流退火,巨应力阻抗效应显著提高,并且ΔZ/Z最大值随退火电流密度的增加先增加然后减小.Fe78Si9B13合金在40 MPa预应力下,经34 A/mm2电流退火后,阻抗的最大相对变化率达到180 %.认为上述阻抗变化与电流退火过程中应力感生各向异性有关.     

热处理时间和压制密度对氮化钽粉电性能的影响

用均相钠还原得到的纳米氮化钽粉在1 350℃进行不同时间的热处理,热处理后的粉末制成烧结体并进行阳极氧化过程。通过XRD和场发射扫描电镜分析了粉末的物相结构和形貌,研究了热处理时间和压制密度对氮化钽粉末电性能的影响。结果表明:热处理温度为1 350℃、热处理时间40min、压制密度约4g/cm时氮化钽阳极块体有较高的比容和较低的漏电流常数。     

Effect of Annealing Conditions on the Texture and Normal Anisotropy of Al‐Killed Steels in Simulated Batch Annealing

Three commercial cold rolled Al‐killed steels were investigated to study the effect of annealing conditions on the crystallographic texture and the resulting plastic anisotropy. The heating rates, maximum temperatures and isothermal holding times were varied in 18 laboratory scale thermal cycles applied to all steels. The annealed and skin‐passed samples were tensile tested to determine mechanical properties and anisotropy parameters. Grain structures and average grain sizes were examined by an optical microscope and the textures were measured by X‐ray diffraction. It was found that the chemical composition of the steel had a significant effect on the texture and normal anisotropy obtained at certain heating rates. The differences between the current steels were discussed in the light of the competition between the kinetics of AIN precipitation and recrystallization. Excess heating rates led to a low normal anisotropy, which was not improved by extending the isothermal time of annealing. Pancake grain structure and the grain size larger than 20 mm were found to be indicators of the properly chosen heating rate and resulting in high normal anisotropy. At the proper heating rate high normal anisotropy was attained at low annealing temperatures and in short isothermal times, but a longer isothermal annealing was required to obtain a low yield strength.     

不同退火工艺下TWIP钢微观组织及力学性能演变

摘要：以在650℃温轧的Fe-24Mn-2Al-1Si-0.05C TWIP钢为研究对象,通过金相显微镜(OM)、扫描电镜（SEM）、透射电镜（TEM）、室温拉伸等实验手段,研究温轧TWIP钢在回复退火、部分再结晶退火、高温短时退火以及高温退火等不同退火工艺下其微观组织及力学性能的演变。结果表明,随着退火工艺的改变,实验钢的微观组织由回复退火时包含高密度位错、形变孪晶等的变形晶粒逐渐向高温退火时的无畸变再结晶晶粒转变;而部分再结晶退火时,实验钢的微观组织由未再结晶区的变形晶粒和细小的再结晶晶粒混合组成。随退火工艺的改变,实验钢拉伸前、后的硬度变化趋势为先下降然后基本不变最后上升;实验钢的变形机制逐渐由位错滑移为主向孪生滑移为主转变。     

退火对GaAs窗口晶体断裂模数的影响

LEC GaAs晶片经高温退火后，残余应力得以部分释放；从而减小残余应力诱生断裂的可能性，提高了GaAs晶体的断裂模数。原生GaAs晶片加工的样品的断裂模数平均值约为135MPa，经退火的GaAs晶片加工样品的断裂模数平均值更高，约为150MPa，断裂模数最高值达163MPa。     

Giant Magnetoimpedance Effect in Fe89Zr7-xHfxB4 Ribbon

The giant magnetoimpedance (GMI) effect in Fe89Zr7-xHfxB4 (x=0.5 or 1.0) ribbon annealed at different temperatures was investigated. The results show that some addition of hafnium to Fe-Zr-B raises the GMI effect. There is an optimum annealing temperature about 570℃ for obtaining large GMI behavior in Fe89 Zr7-xHfxB4 (x=0.5 or 1.0) nanocrystalline ribbons. At 900 kHz, the magnetoimpedance for Fe89 Zr6Hf1B4 nanocrystalline ribbon monotonically changes with applied DC field, and reaches-33.4 % at 7 162 A/m. Meanwhile, the results show that the transverse anisotropy field of Fe89 Zr6 Hf1 B4 ribbons decreases with increasing annealing temperature from 520℃ to 620℃.     

Influence of Magnetic Annealing on Properties of SmFe Thin Films

SmFe thin films were prepared by DC magietron sputtering at room temperature and 300 %. The influence of magnetic annealing temperature on the phase structure and magnetic properties was investigated. Results showed that thermal sputtering followed by a heat treatment process helped to obtain a structure with a relatively large fraction of SmFe2. Residual phases observed were α-Fe, Sm2O3, and unknown phases. During the annealing treatment, the intrinsic compressive stress in SmFe films was relieved and could become tensile at higher annealing temperatures. The degree of in-plane anisotropy weakened, and furthermore, the anisotropy transformed into out-of-plane anisotropy.     

退火处理对冷喷涂Ni涂层组织与力学性能的影响

采用普通光学显微镜、扫描电镜、透射电镜、电子探针、显微硬度和常温拉伸等方法,研究了退火处理对冷喷涂Ni涂层组织与力学性能的影响。结果表明,随退火温度的升高,涂层的硬度逐渐降低,断后延伸率逐渐增加,而抗拉强度先增后减,其拉伸断裂行为由脆性断裂过渡到脆、延性混合断裂,最后转变为延性断裂;冷喷涂Ni涂层在高温退火时（如900℃）,易发生晶粒的不一致长大、氧化物球化团聚以及各种缺陷向晶界扩散聚集形成孔洞等现象,这均降低了高温退火涂层的抗拉强度。指出合理的后续退火处理可以大幅提高冷喷涂Ni涂层的抗拉强度,但退火难以消除涂层中大的缺陷,不能显著增加其断后延伸率。     

深冷对逆相变处理中锰钢组织性能的影响

为了研究原始组织状态对逆相变退火中锰钢微观组织和力学性能的影响,对淬火处理的中锰钢再进行-74℃深冷处理,采用SEM、EBSD、XRD等手段评价了逆相变退火处理后的微观组织,用单轴拉伸和冲击试验评价力学性能.研究结果表明:淬火态中锰钢的组织由马氏体和体积分数约为33％的残余奥氏体组成,深冷处理后得到残余奥氏体体积分数小...     

Microstructure and Mechanical Properties of High Manganese TRIP Steel

 Abstract： Microstructure evolution and mechanical properties of newly designed 01C-6Mn-05Si-1Al TRIP-aided steels under different annealing conditions and the effects of matrix microstructure before intercritical annealing on the final microstructure were studied by means of X-ray diffraction (XRD), scanning electron microcopy (SEM), dilatometric simulation, optical microstructure (OM) and tensile testing in this work. The experimental results indicate that the TRIP steel with Mn of 6% could form a considerable amount of retained austenite with good TRIP effect after a simple intercritical annealing treatment, and the matrix microstructure before intercritical annealing treatment can greatly affect the final microstructure. The original microstructure of the ferritic matrix steel was eliminated, while annealed martensite was remained from the martensite matrix steel under the same intercritical annealing conditions.     

PTP药箔基材生产工艺研究

采用拉伸试验、杯突试验、表面张力试验和针孔度检查,测定、分析了四种不同生产工艺方案样品的力学性能、破裂强度、表面张力以及针孔度,确定了合理的8011-H18状态PTP药箔基材生产工艺。结果表明:采用8011铝合金铸轧坯料可以生产高质量的PTP铝箔基材,在其冷轧至1.5mm时进行中间退火,退火制度为450～470℃/11～13h。通过对铸轧、冷轧和箔轧工艺的配合,可获得高表面质量和力学性能的PTP铝箔基材。     

渗硅+退火对取向硅钢组织及磁性能的影响

研究了3 %取向硅钢经过固体渗硅+扩散退火后组织、物相、成分的变化情况以及其对磁性能的影响。结果表明：在950 ℃下渗硅6 min可以在取向硅钢上制备出组织良好的化合物层,表面物相为Fe3Si和FeSi;经1 050 ℃退火1 h后,得到组织性能良好的退火样品,当退火时间为2 h,得到硅的质量分数接近6.5 %（6.43 %）的均匀化样品,表面物相变为单一的α-Fe相;经过渗硅+退火后,样品的高频铁损显著降低（50 %~86 %）,其中退火1 h样品铁损降低率更高。经渗硅+退火后,磁感应强度降低。     

Work Hardening Behavior of Ultrafine Grained Duplex Medium‐Mn Steels Processed by ART‐Annealing

The ultrafine grained duplex steels were fabricated by austenite reverted transformation annealing of the medium manganese steels after quenching or cold rolling. The microstructures were examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) and X‐ray diffraction (XRD). The mechanical properties were determined by uniaxial tensile test. It was demonstrated that both the quenched and cold rolled structures were transformed into ultrafine grained duplex structures with large fractioned austenite by ART‐annealing. Long time annealing is essential to obtain the large fractioned austenite in quenched steel, but only short time annealing is needed to get large fractioned austenite in the cold rolled sheet. The mechanical examinations indicated that ART‐annealing results in the superhigh tensile elongation (>40%) and superhigh strength (1000 MPa) in quenched steels after long time annealing but in cold rolled steels after short time annealing. Based on the analysis on the work hardening behaviors of these ART‐annealed steels, the abnormal work hardening rate was presented and analyzed. The substantially enhanced ductility was attributed to the Lüders band propagation of the ferrite matrix and/or the TRIP effects of the large fractioned austenite. At last the dynamic phase natures of both fraction and stress was proposed to interpret the abnormal hardening behaviors and the “S” shaped stress–strain curves.     

工艺参数对800 MPa热镀锌双相钢组织性能的影响

 在实验室试制了低Si 的C Mn Cr Mo系的800 MPa级冷轧热镀锌双相钢,研究了卷取温度、退火温度、退火时间等工艺参数对双相钢微观组织和力学性能的影响。试验结果表明：试验用钢在820~850 ℃退火,保温100 s以上,抗拉强度可以达到800 MPa级以上。随着退火温度的升高,强度升高,但综合性能以退火温度为820 ℃时为最佳。在820 ℃退火时,随着保温时间的增加,双相钢的强度显著增加,当保温时间超过100 s以后,强度增加缓慢。690 ℃高温卷取有利于获得最终力学性能良好的双相钢组织。     

电流退火对冷轧硅钢组织的影响

 研究了不同电流条件下退火冷轧无取向硅钢组织的变化规律。结果表明：电流对硅钢组织有显著影响。在施加直流电流退火条件下,再结晶速度比不施加电流退火时快得多,但施加交流电退火时的再结晶速度比施加直流电流退火时慢。     

Nonlinear current-voltage characteristics originated from phase segregation and micro-cracks in polycrystalline La_（0.67）Ba_（0.33）MnO_3

Polycrystalline La0.67Ba0.33MnO3 bulk samples were annealed in flowing 95%Ar:5%H2 (AH) mixed gas at 973 K for different time respectively. The influence of the annealing time on the current-voltage properties was systematically investigated. Linear current-voltage characteristics were observed in the as-prepared and the 10 h annealed samples, and nonlinear current-voltage characteristics was found in the 100 h annealed sample. At the same time, segregation of impurity phase and micro-cracks were found on the surfaces of the 100 h annealed samples, which was testified to be Ba ion impurity. Analysis showed that the changes of electronic properties were caused by barium ion im-purities and micro-cracks in the 100 h annealed sample.     

柱状晶组织高硅电工钢二次再结晶的形成机理

  二次再结晶的发生会显著改变电工钢带材的组织和织构，进而影响其磁性能。以柱状晶组织高硅电工钢冷轧带材为研究对象，研究了不同退火方法对试样组织和织构的影响，明确了二次再结晶的发生条件、形成机理和控制方法。研究结果表明，柱状晶组织高硅电工钢冷轧试样发生二次再结晶的温度区间为850～1 000 ℃，在900 ℃退火可获得最大的晶粒尺寸。二次再结晶的形成是由于初次再结晶后试样的组织形成了织构抑制作用，小角度晶界抑制晶粒正常长大，大角度高能晶界迁移率高，具有大角度晶界的晶粒以取向长大方式发生二次再结晶。当退火温度高于1 000 ℃时，升温和冷却速率大于5 ℃/min可以有效抑制二次再结晶的发生。