Sn元素对Mg-1Zn-0.3Zr-1Y生物镁合金组织和性能的影响

通过光学显微镜(OM)、扫描电镜(SEM)、浸泡试验、析氢试验、电化学试验和拉伸试验等研究了Sn元素对Mg-1Zn-0.3Zr-1Y-xSn(x=0、0.5、1、1.5、2、2.5、3)生物镁合金组织、耐蚀性能和力学性能的影响.结果 表明:添加Sn元素后,合金的耐蚀性和综合力学性能都有一定的提升.当Sn含量为2 mas...     

2 1/4Cr-1Mo-1/4V钢板热处理工艺试验

介绍了对21／4Cr-1Mo-1/4V钢板进行的热处理工艺试验以及对试验钢板的力学性能试验结果，在此基础上得出了该钢种合理的热处理工艺规范。     

温度对1Cr11MoNiW1VNbN不锈钢疲劳性能的影响

以超临界汽轮机叶片用1Cr11MoNiW1VNbN不锈钢为研究对象,测试叶片模拟工作温度下拉压疲劳极限的变化规律,用扫描电镜观察试样宏观及微观断口.结果表明,1Cr11MoNiW1VNbN不锈钢试样的疲劳极限随试验温度的变化有明显变化.当试验温度为538、566、593 ℃时,试验钢的拉压疲劳极限的最大变化量为81 MPa.其疲劳试样宏观断口包括裂纹萌生、裂纹扩展及最终断裂3个阶段,存在明显的裂纹前沿;微观断口具有典型的准解理断口特征.     

1(1/4)Cr—(1/2)Mo耐热钢焊接工艺试验

本文介绍美国引进的1(1/4)Cr—(1/2)Mo耐热钢匹配以国产焊丝、焊条的工艺评定试验及现场工程应用。     

国产21／4Cr-1Mo-1／4V钢工艺焊接性试验

本文通过对国产21／4Cr-1Mo—1／4V钢的工艺焊接性试验确定了国产钢板的焊接预热、后热参数,经试验评定,表明其焊接接头性能满足加氢设备的技术要求。     

TA1本构模型的确定

采用试验方法,通过准静态压缩试验和分离式Hopkinson压杆试验,获得不同应变率10-3s-1～103s-1和不同温度293K～873K范围内TA1的应力-应变曲线;基于Johnson-Cook模型对试验结果进行分析,并对其应变率强化项做出修正。结果表明,TA1为应变率敏感材料,流动应力随应变率增加而增加,随温度增加而减小;未经修正的Johnson-Cook本构模型与试验数据偏差较大,修正后的本构模型与试验值吻合较好。     

1HJ、1HJ_b系列机械滑台(普通级、精密级)

本文介绍了1HJ、1HJ~b系列机械滑台的用途、特点、试验研究情况、结构系列与传动系统等,图8幅、表2个.     

1Cr17Ni2钢晶间腐蚀试验

通过一系列试验，分析、探讨了1Cr17Ni2钢晶间腐蚀的试验方法与机理。     

12Cr2Mo1R＋OCr18Ni1OTi中温抗氢复合材料的焊接工艺评定

本文介绍了12Cr2Mo1R＋OCr18Ni10Ti材料焊接性的分析，进行焊接工艺评定试验过程和在试验过程中遇到的难点，尤其是回火脆化试验，提出12Cr2Mo1R＋OCr18Ni10Ti材料在焊接过程应注意预热、消氢、焊后热处理的控制以及应采取的解决措施。     

X12CrMoWVNbN10-1-1钢δ铁素体析出规律研究

通过大量试验研究了X12CrMoWVNbN10-1-1钢δ铁素体的析出规律。试验结果表明:δ铁素体在1 100℃以下保温时析出并不明显,在1 100℃以上时,随着加热温度的提高将大量产生。尤其在1 150℃以上时,析出大量δ铁素体,严重降低钢的冲击韧性,影响材料的力学性能。     

Electrical conductivity of 1 : 1 and 2 : 1 clay minerals

The A.C. impedance plots were used as tools to analyze the electrical response of two varieties of Tunisian halloysite 1: 1 and illitic samples 2: 1 as a function of frequency at different temperatures (80–800°C). The real and imaginary parts of the complex impedance trace semicircles in the complex plane. Except for the illite, It-1, the second sample analyzed in this study, these plots give evidence for the presence of both bulk and grain boundary effect, above 600°C onwards. The bulk resistance of the materials decreases with the rise in temperature. Impedance Spectroscopy data reveal a non-Debye type of dielectric relaxation. The Nyquist plots show the negative temperature coefficient of resistance of both pure Tunisian illite and halloysite samples. The results of bulk electrical conductivity and its activation energy are presented for the two mineral clay samples. For illite It-1, the activation energy values estimated from the AC conductivity pattern and modulus pattern are very similar and suggest a possibility of a long-range mobility of charge carriers (ions) via hopping mechanism of electrical transport processes at higher temperature. On the other hand, for the halloysite sample provided from kasserine, (Ha-Kass), the modulus analysis admit that the electrical transport processes of the material are very likely of electronic nature. Relaxation frequencies follow an Arrhenius behavior with the activation energy values not comparable to those found for the electrical conductivity.     

1SRQ1系列全数字软起动器

文章介绍了软起动器的产品特点和主要技术性能指标，并与部分传统控制方式作了一些比较。     

Stabilization of extended stacking faults by {1 1 1}/{1 1 2} twin junction interactions

Extended stacking faults, with lengths of up to 10 nm, that join {1 1 1}/{1 1 2} twin-boundary junctions were observed by high-resolution transmission electron microscopy (HRTEM) in gold thin films. Circuit analysis shows that these defects possess a Burgers vector of 1/3〈1 1 1〉. In order to explain the generation of these extended defects, we consider the behavior of 1/3〈1 1 1〉 dislocations at {1 1 1}- and {1 1 2}-type twin boundaries and near {1 1 1}/{1 1 2} twin-boundary junctions using HRTEM observations and theoretical modeling. By establishing the interaction forces that lead to this defect configuration, our analysis shows that the relief of intrinsic strain at the junction corners, which results from the incompatibility of the translation states at the intersecting boundaries, is sufficient to stabilize the stacking fault extension. Because grain–boundary junctions possess intrinsic strain fields whenever they join boundaries with incompatible translation states, similar mechanisms for stacking fault emission may arise between other closely spaced grain–boundary junctions.     

A contribution to the crystallochemistry of ternary 1:1:1 and 1:1:2 rare earth intermetallic phases with Pb and Pd

The ternary alloys of the rare earths with lead and palladium were studied for the stoichiometric ratios 1:1:1 and 1:1:2 with respect to the structure of these alloys and their existence field. RPbPd (R = La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Y, Ho, Er, Tm, Yb) compounds have a hexagonal structure, hP9 Fe₂P type, while RPbPd₂ (R = Pr, Sm, Gd, Tb, Dy, Ho, Er, Yb) alloys have the cubic AlCu₂Mn-type structure (cF16, BiF₃ superstructure).     

20Cr1Mo1V1钢的分级时效工艺研究

研究了 2 0Cr1Mo1V1钢的强韧化工艺。所优化出的分级时效工艺能使其强度和韧性达到质保书的要求。