材料期刊网

STRENGTHENING CAST IRON MATRIX BY ALLOYING ELEMENTS WITH POSITIVE AND NEGATIVE SEGREGATION

Z.K. Fan , Y.Q. Wang , S.H. Liangand HS. Huang(School of Materials Science and Engineering , Xi'an University of Technology , Xi'an 710048 , China)(Mechanical Engineering Department , Tsinghua University , Beijing 100084 , China)

金属学报(英文版)

The combinational use of alloying elements with positive and negative segmpation hasbeen shown to be very thective in strengthening the matrix of cast iron. Negativesegmpation alloying elements, Cu and Si, make the inner parts of dendritic austenitesand eutectic cells get good handenability. On the contrury, positive segmpation alloyingelements Cr and Mn make the outer parts of dendrites have higher microhaofness.Appropriate combination of the above two tyPes Of alloying elements can produce auniform microharkness and high strength in grny cast irons.

关键词: cast iron , null , null

Two-step magnetization in a spin-chain system on the triangular lattice: Wang-Landau simulation

Physical Review B

The Wang-Landau algorithm is used to study the thermodynamic and magnetic properties of triangular spin-chain system based on two-dimensional Ising model in order to understand the magnetic-order dynamics in Ca(3)Co(2)O(6) compound. The calculated results demonstrate that the equilibrium state of the rigid spins produces the two-step magnetization curve at low temperature even when the random-exchange term is considered. This work indicates that the four-step magnetization behavior observed experimentally must be due to the nonequilibrium magnetization.

关键词: calcium compounds;exchange interactions (electron);Ising model;magnetisation;thermodynamics;one-dimensional ca3co2o6;density-of-states;compound ca3co2o6;phase-diagram;proteins;crystal

Q235钢基体LZAS微晶玻璃/Y-TZP梯度涂层接触应力的数值模拟

龚伟 , 周黎明 , 王恩泽 , 白朝中

材料工程 doi:10.11868/j.issn.1001-4381.2014.09.004

运用有限元软件对Hertz接触状态下Q235钢基体LZAS微晶玻璃/Y-TZP梯度涂层的接触应力进行了分析.讨论了梯度层厚度、梯度层层数和物性参数渐变方式(3Y TZP体积组分差)对涂层接触应力分布情况的影响.结果表明:涂层的径向接触应力和Mises应力的最大值位于接触中心处,最大剪切应力则位于涂层表层下方靠近接触中心处;涂层表面径向应力、整体最大Mises应力和涂层/基体界面剪应力与涂层的层数、厚度以及3Y-TZP体积组分差均有密切关系.

关键词: 功能梯度涂层 , 接触应力 , 有限元分析 , 应力分布

Ion sputter erosion in metallic glass-A response to "Comment on: Homogeneity of Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass" by L-Y. Chen, Y-W. Zeng, Q-P. Cao, B-J. Park, Y-M. Chen, K. Hono, U. Vainio, Z-L. Zhang, U. Kaiser, X-D. Wang, and J-Z Jiang J. Mater. Res. 24, 3116 (2009)

Journal of Materials Research

The morphology of the dark and bright regions observed by transmission electron microscopy for the Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass strongly depends on the ion beam parameters used for ion milling. This indicates that the ion beam could introduce surface fluctuation to metallic glasses during ion milling.

关键词: room-temperature

321-Q370q复合板焊接冷裂纹敏感性试验研究

王小华 , 辛宝 , 撒世勇 , 吴伦发

材料开发与应用 doi:10.3969/j.issn.1003-1545.2008.06.015

Q370q钢是武汉钢铁公司和中铁大桥工程局共同研究开发的新型桥梁用钢.为了达到永久性防腐蚀的目的,采用爆炸焊接法制成321-Q370q复合板.本文研究了321-Q370q复合板焊接冷裂纹敏感性,试验结果表明:321-Q370q复合板具有优良的抗裂性能.

关键词: 321-0370q复合板 , 冷裂纹敏感性 , 试验

桥梁钢Q345q疤状缺陷分析

余宏伟，王世森，王孝东，洪君

物理测试

针对鄂钢轧制的部分宽厚板表面出现结疤现象，应用金相显微镜、扫描电镜和能谱分析仪对Q345q热轧态钢板表面疤状物形态和成分进行观察，对形成原因进行分析并提出改进措施。结果表明:疤状缺陷为块状的非金属夹杂/渣，并在钢板表面形成凹坑，其成分为含有Si、Ti、Al、Ca、Mg的氧化物或硅酸盐、铝酸盐等，其主要为炼钢过程中的脱氧产物和合金的氧化产物。因此在生产过程中，通过去除钢水中夹杂物和清理铸坯等，减少非金属夹杂/渣，以提高钢板表面质量。

关键词: Q345q , scar defect , plate , non-metallic inclusions , non-metal lards

桥梁钢Q345q疤状缺陷分析

余宏伟 , 王世森 , 王孝东 , 洪君

物理测试

针对鄂钢轧制的部分宽厚板表面出现结疤现象,应用金相显微镜、扫描电镜和能谱分析仪对Q345q热轧态钢板表面疤状物形态和成分进行观察,对形成原因进行分析并提出改进措施。结果表明：疤状缺陷为块状的非金属夹杂/渣,并在钢板表面形成凹坑,其成分为含有Si、Ti、Al、Ca、Mg的氧化物或硅酸盐、铝酸盐等,其主要为炼钢过程中的脱氧产物和合金的氧化产物。因此在生产过程中,通过去除钢水中夹杂物和清理铸坯等,减少非金属夹杂/渣,以提高钢板表面质量。

关键词: Q345q , 疤状缺陷 , 钢板 , 非金属夹杂 , 非金属夹渣

Effect of Thermomechanical Controlled Processing Parameters on the Microstructure and Properties of Q460q Steel

WANG Lei , GAO Cai-ru

钢铁研究学报(英文版)

Thermal mechanical control processing (TMCP), the combination of controlled rolling and controlled cooling, provides a powerful means of developing high-strength low alloy (HSLA) steels by intensive microstructural control. In the present investigation, the effects of TMCP parameters, consisting of the finish cooling temperature and the start rolling temperature in non-recrystallization region, on the final microstructure and mechanical properties of Q460q steel have been studied by tensile, Charpy impact tests, optical microscopy. The TMCP parameters for Q460q steel have been optimized by laboratory experiments. And the microstructure and properties of industrial product were coincident with the results of laboratory experiments.

关键词: ;TMCP;mechanical properties;M/A constituent;Q460q steel

Fe3Al合金与Q235钢扩散焊界面的析出相

王娟 , 李亚江 , 马海军

金属学报

采用扫描电镜(SEM)、能谱分析(EDS)、X射线衍射(XRD)和电子探针(EPMA)对Fe3Al/Q235扩散焊界面的析出相形貌进行观察和成分测定，研究微观析出相的形成以及工艺参数(T, t , p)的影响. 结果表明， Fe3Al/Q235扩散焊界面靠近Fe3Al一侧形成FeAl(Cr)析出相，是引起扩散焊接头脆性断裂的关键. 扩散焊温度T、保温时间t与析出相区宽度y符合抛物线规律: y2=3.5 (t-t0)exp[-5.6×104/(RT)]. 在降低加热温度和保温时间的条件下，增加焊接压力可促进Fe3Al/Q235界面原子的扩散，避免脆性析出相的形成，保证Fe3Al/Q235扩散焊接头的性能.

关键词: Fe3Al合金 , steel Q235 , diffusion bonding

Fe3Al合金与Q235钢扩散焊界面的析出相

王娟 , 李亚江 , 马海军

金属学报 doi:10.3321/j.issn:0412-1961.2005.09.017

采用扫描电镜(SEM)、能谱分析(EDS)、X射线衍射(XRD)和电子探针(EPMA)对Fe3Al/Q235扩散焊界面的析出相形貌进行观察和成分测定,研究微观析出相的形成以及工艺参数(T,t,p)的影响.结果表明,Fe3Al/Q235扩散焊界面靠近Fe3Al一侧形成FeAl(Cr)析出相,是引起扩散焊接头脆性断裂的关键.扩散焊温度T、保温时间t与析出相区宽度y符合抛物线规律:y2=3.5(t-t0)exp[-5.6×104/(RT)].在降低加热温度和保温时间的条件下,增加焊接压力可促进Fe3Al/Q235界面原子的扩散,避免脆性析出相的形成,保证Fe3Al/Q235扩散焊接头的性能.

关键词: Fe3Al合金 , Q235钢 , 扩散焊 , 析出相