材料期刊网

CARBIDE PRECIPITATION AND BAINITE TRANSFORMATION IN Fe-C-Si ALLOY

R.L. Zuo , L. Fang and P. D. Ding(Department of Metallurgy and Materials Engineering , Chongqing University , Chongqing 630044 , China)

金属学报(英文版)

The upper bainite formed isothermally at 480℃ C in Fe-0. 38C-1. 73Si alloy was studied by using transmission electron microscopy (TEM). It was found by electron diffraction and crystallographic analysis that bainitic carbide precipitation originated from bainitic ferrite (BF), in which the initial supersaturation did not come up to the average carbon content of the alloy. It is suggested that bainite transformation in steel should be a coupled process of transformation dislocation movement controlled by carbon diffusion in austenite.

关键词: : bainite , null , null , null

316L-Q345R不锈钢复合板性能评价

金贺荣 , 杨旭坤 , 宜亚丽

材料工程 doi:10.11868/j.issn.1001-4381.2016.08.017

从微观组织和显微硬度两方面对真空热轧316L‐Q345R不锈钢复合板试样性能进行评价。采用电子显微和能谱分析技术，对试样进行微观组织特征观察和成分含量测定，研究相结构及成分变化规律。通过硬度测试仪对复合板界面附近硬度进行测量，研究微观组织与硬度关系。结果表明：热轧后复合板 Q345R侧显微组织以铁素体和珠光体为主，316L侧显微组织为单一奥氏体，一部分晶粒呈孪晶状态，Q345R低合金钢和316L不锈钢经过热轧可良好复合，复合界面平直；界面两侧元素存在扩散现象，不锈钢中Cr ，Ni元素向低合金钢侧扩散，在界面形成富Cr ，Ni薄层，低合金钢中C向不锈钢侧产生少量迁移；在复合界面处的硬度值较大，低合金钢侧远离界面位置复合板硬度与Q345R本身硬度值接近，而从界面到不锈钢侧硬度呈现先下降后上升至稳定的趋势。

关键词: 不锈钢复合板 , 金相组织 , 元素扩散 , 硬度

316L/Q345R热轧复合板界面组织演变及性能

刘宝龙 , 张慧芳 , 肖振兴 , 吕知清 , 傅万堂 , 任廷志

钢铁 doi:10.13228/j.boyuan.issn0449-749x.20160535

利用扫描电子显微技术结合能谱分析对316L/Q345R热轧复合板结合界面组织及元素扩散情况进行了检测,通过热力学计算分析了界面附近碳的分布规律,并测量了结合界面的显微硬度与剪切强度.结果表明,结合界面碳钢一侧存在约50μm的铁素体带,而不锈钢侧存在约100μm的元素扩散影响区;不锈钢中铬、镍等元素向碳钢中扩散,碳钢中碳元素向不锈钢中扩散;复合板界面剪切强度为373 MPa,明显高于标准规定的210 MPa,略低于Q345R与316L剪切强度和的1/2(379 MPa).

关键词: 不锈钢复合板 , 界面组织 , 元素扩散 , 硬度 , 剪切强度

ANOMALOUS 3D-ANISOTROPY OF R2FE14C AND R2FE14B COMPOUNDS

Journal of Magnetism and Magnetic Materials

The temperature dependence of the anisotropy field H(A) and the thermal expansion DELTA-l/l0 of R2Fe14X (R = Gd, Lu; X = B,C) were measured by applying the SPD technique for H(A)(T) and a membrane technique for DELTA-l(T)/l0. Comparing Lu2Fe14B and Lu2Fe14C the difference in the temperature dependence of H(A) is associated with the difference in the Invar-like thermal expansion between the two compounds.

关键词: 3d magnetism;anisotropy;gd2fe14b

R-line thermal shift and thermal broadenings of R, R' and B lines for ruby

Communications in Theoretical Physics

The unified theoretical calculation of thermal shifts (TS) of R-1 and R-2 lines and thermal broadenings (TB) of R, R' and B lines for ruby was carried out for the first time. The calculated results are in very good agreement with a great number of experimental data. Especially by using quantum theory and taking into account all the admixtures of wavefunctions within d(3) electronic configuration, all the Gamma M in electron-phonon interaction (EPI), the electronic energy spectrum and lattice-vibration Spectrum, the very important contributions to TS and TB from single-phonon direct process were theoretically calculated in detail. The microscopic essentials of various contributions are revealed, and the mistakes in previous work are remedied.

关键词: diamond anvil cell;pressure measurement;spectroscopy;temperatures

有机溶剂中(R)-醇腈酶催化不对称合成(R)-苯乙醇腈

刘森林 , 宗敏华 , 余少文 , 张小云 , 邢苗

催化学报

研究了来源于杏仁的(R)-醇腈酶在有机溶剂异丙醚中催化苯甲醛与HCN不对称合成(R)-苯乙醇腈,初步探讨了来源于不同杏仁的(R)-醇腈酶的筛选、最适酶量的确定以及底物HCN与苯甲醛的配比、底物浓度、酶的微环境pH和反应温度对不对称合成反应的影响. 结果发现,来源于苦杏仁的(R)-醇腈酶优于来源于甜杏仁的(R)-醇腈酶. 优化的反应条件为:最适酶量150 g/L,HCN与苯甲醛的配比2.5,苯甲醛浓度300 mmol/L,酶的微环境pH 5.4,反应温度0～5 ℃. 在该优化反应条件下,反应平衡转化率和产物的光学纯度均高达99%以上.

关键词: 苯甲醛 , 氰化氢 , (R)-醇腈酶 , 不对称合成 , (R)-苯乙醇腈

微碳深冲钢板的非{111}织构特征及其对r,△r值的影响

吕庆功 , 陈光南 , 常军 , 程兴德 , 唐历 , 周家琮

金属学报

在生产试制的St15微碳深冲钢板中,选择 变化、△γ一定和 一定、△γ变化的两组试样,对其进行织构测量及ODF分析,进而对织构特征进行了描述,并分析了主要织构对 ,△γ值的影响特点结果表明:试制的这批St15微碳深冲钢板没有出现理想的γ〈111〉∥ND取向线织构,而是主要体现为γ＇取向线(Ψ=0-90°,θ=19°,ф=45°)和围绕γ〈111〉∥ND取向线从Ψ=0°,θ=54.7°,ф=62.7°螺旋旋转到Ψ=90°,θ=40°,ф=45°的L取向线.其中,L取向线主要影响 值,织构越强 值越大,但对△γ值不利.γ＇取向线主要影响△r值,织构越强△r值越小但对 值不利强的L取向线织构配以较强的γ＇取向线织构可以获得良好的 ,△r值.

关键词: 微碳深冲钢板 , null , null

Theoretical calculations of thermal broadenings and transition probabilities of R, R ' and B line-groups for ruby

Communications in Theoretical Physics

On the basis of the unified calculation of the thermal shifts of R-1 line, R-2 line and ground-state-splitting as well as the thermal broadenings of R, R' and B line-groups for ruby, by taking into account all the levels and admixtures of wavefunctions within d(3) electronic configuration and all the GammaM in electron-phonon interaction, the transition probabilities of direct and Raman processes have theoretically been calculated. The thermal broadenings, of R, R' and B line-groups have successfully been interpreted in terms of the direct and Raman processes of acoustic phonons. The theoretically predicted transition probabilities are in good agreement with the experimental ones.

关键词: crystal fields;electron-phonon interaction;thermal broadening;transition probability;direct and Raman processes;shifts

Phase diagram of R-Fe-Co pseudoternary system with R <= 33.3% (mole fraction, R = Sm0.5Dy0.5)

Transactions of Nonferrous Metals Society of China

Phase equilibria of the R-Fe-Co pseudoternary system with R less than or equal to 33.3% ( mole fraction, R = Sm0.5Dy0.5) were determined in an isothermal section at 1073 K and a vertical section of RFe2-RCo2 by using OM, X-ray diffractometer, EP-MA DTA techniques. There are seven intermetallic phases: (Sm, Dy) (Fe, Co)(2), (Sm, Dy) (Fe, Co)(3), (Sm, Dy)(6) (Fe, Co)(23), (Sm, Dy)(2) (Fe, Co)(7), (Sm, Dy) (Fe, Co)(5), Th2Ni17-type and Th2Zn17-type (Sm, Dy)(2)(Fe, Co)(17). The (Sm, Dy)(6)(Fe, Co)(23) phase dissolves 36% Co(mole fraction) at 1073 K. However, the (Sm, Dy)(2)(Fe, Co)(7) phase in R-2(Fe1-xCox)(7) alloys dissolves about 19% Fe(mole fraction) at 1073 K.

关键词: rare earth-iron-cobalt;phase diagram;structure;compounds;sm-co;magnetic-properties;binary-system;magnetostriction

NEUTRON DIFFRACTION STUDY ON R_2Fel_(17)N_x(R=Y,Dy,Nd)

YANG Jilian ZHANC Baisheng DINC Yongfan China Institute of Atomic Engergy , Beijing , ChinaYANG Yingchang ZHANG Xiaodong Peking University , Beijing , ChinaPAN Shuming General Research Institute for Non-Ferrous Metals , Beijing , China associate professor , P.O.Box 275 , Branch No.30 , Beijing 102413 , China

金属学报(英文版)

The N occupying sites and magnetic structures in R_2Fe_(17)N_x(R=Y,Dy,Nd)are de- termined by neutron diffraction.The effects of the site occupation of N on magnetic properties are discussed primarily.

关键词: neutron diffraction , null , null , null , null , null