材料期刊网

FUNDAMENTAL PROBLEMS IN PULSED-BIAS ARC DEPOSITION

G.Q.Lin , Z.F.Ding , D.Qi

金属学报(英文版)

Arc deposition, a widely used surface coating technique, has disadvantages such aslarge droplet size and high deposition temperature. Recent trend in its renovation isthe introduction of pulsed bias at the substrate. The present paper attempts to describethe deposition process of TiN films using this technique with emphasis laid on theunderstanding of the basic problems such as discharge plasma properties, temperaturecalculation, and droplet size reduction. We show that this technique improves thefilm microstructure and quality, lowers deposition temperature, and allows coatingson insulating substrates. After analyzing load current oscillation behaviors, we havedetermined that the plasma load is of capacitance nature due to plasma sheath and thatit is equivalent to a circuit element consisting of parallel capacitance and resistance.At last, we point out the remaining problems and future development of the pulsed-biasarc deposition technique.

关键词: arc deposition , null , null

Q235(G)连铸坯角部横裂纹的影响因素及对策

何天科 , 谢永中

连铸 doi:10.3969/j.issn.1005-4006.2002.04.014

本文对Q235(G)连铸坯角部横裂纹的影响因素进行分析,指出在现有连铸工艺设备条件下,存在易产生角部横裂纹的因素.通过采取措施,铸坯角裂纹得到有效控制.

关键词:

钼酸盐系列缓蚀剂在含5g/L Cl^-溶液中对Q235钢的缓蚀研究

沈素峰

腐蚀学报（英文）

  通过电化学阻抗谱(EIS)，研究了钼酸盐系缓蚀剂在含g">5g/L Cl^-溶液中对Q235钢的缓蚀性能，结果表明：由钼酸盐为主盐与硅酸盐、磷酸盐、有机胺A复配而成的缓蚀剂，可以达到低成本、高缓蚀率的效果.并通过失重法实验对此配方进行了验证，复配缓蚀剂的缓蚀率接近88.4%，明显高于单组分缓蚀剂.

关键词: 钼酸盐 , inhibitor , compound inhibitors

马氏体含量对St12Q1和St37-2G双相钢力学性能的影响

苏钰 , 符仁钰 , 李麟

上海金属 doi:10.3969/j.issn.1001-7208.2004.04.003

将St12Q1和St37-2G钢在两相区不同温度下加热和淬火,可以得到(F+M)的双相组织,与此同时研究实验用钢在不同热处理工艺下组织和力学性能的关系.结果表明:其应力-应变曲线表现出屈服点低、连续屈服、没有明显的屈服点等特性;提高两相区的淬火温度,可使马氏体量增多;在相同淬火加热温度下,淬火组织的马氏体量随钢的含碳量增加而增多;双相钢的强度只与它所含的马氏体量有关,而与马氏体中的含碳量无关.

关键词: 双相钢 , 金相组织 , 马氏体量 , 力学性能

钼酸盐系列缓蚀剂在含5g/L Cl-溶液中对Q235钢的缓蚀作用

沈素峰

腐蚀学报（英文） doi:10.3969/j.issn.1002-6495.2009.02.034

通过电化学阻抗谱(EIS),研究了钼酸盐系缓蚀剂在含5g/L Cl-溶液中对Q235钢的缓蚀性能,结果表明:由钼酸盐为主盐与硅酸盐、磷酸盐、有机胺A复配而成的缓蚀剂,可以达到低成本、高缓蚀率的效果.并通过失重法实验对此配方进行了验证,复配缓蚀剂的缓蚀率接近88.4%,明显高于单组分缓蚀剂.

关键词: 钼酸盐 , 缓蚀 , 复配缓蚀刺

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

Investigations of the g factors of Fe+ in MgO and CaO

Zeitschrift Fur Naturforschung Section a-a Journal of Physical Sciences

The g factors of Fe+ in MgO and CaO are theoretically investigated by the perturbation formula of the g factor of a V ion in cubic octahedral symmetry based on the cluster approach. By considering the partial quenching of the spin-orbit coupling interaction and the effective Lande factor due to the dynamic Jahn-Teller effect (DJTE), the experimental g factors of the studied systems are reasonably interpreted. It can be suggested that the small g factors of the Fe+ centers in MgO and CaO can be likely attributed to the DJTE, rather than the covalency effect within the scheme of the static crystal-field model.

关键词: electron paramagnetic resonance;crystal- and ligand-field theory;Fe+;MgO;CaO;atomic screening constants;electron spin resonance;paramagnetic-resonance;orbit interaction;scf functions;crystals;spectra;oxide;co2+