Stress corrosion behavior of pipeline steel(X52)welded joint

The resistance of pipeline steel joint welded by submerged arc welding to stress corrosion cracking (SCC) at its different regions in boiling mixed nitrate solution and in H_2S saturated solution at room temperature is examined by the constant-load tension method. The result shows that when tested in nitrate, the weld metal may be the weakest link of the joint if the welding material doesn't match well. The resistance to SCC of the joint in H_2S is very low, especially at the bond and coarse grain zone and is closely dependent on the metallurgical quality of base metal.     

挤压后硼酸铝晶须增强铝复合材料表面的腐蚀特征

利用原于力显微镜观察了挤压态Al18B4O33 w／pure Al复合材料早期腐蚀过程中表面形貌的变化特征．研究了沿与挤压方向成不同角度截取的Al18B4O33 w／pure Al复合材料在3．5％NaCl溶液中的腐蚀规律．结果表明：晶须与基体的界面是腐蚀易于发生的地方．点蚀首先在晶须的端部产生，随后沿着晶须与基体的界面扩展．挤压后沿与挤压方向成不同角度截取的Al18B4O33 w／pure Al复合材料表面腐蚀坑的深度存在差别．     

新旧高温高压临氢不锈钢管的焊接

通过对长期在高温高压临氢条件下不锈厚壁焊焊接难点的分析，制定了合理的焊接工艺有质量控制措施，成功解决了新旧高温高压临氢不锈钢管的焊接难题，确保了焊缝的焊接质量。     

新日铁高炉冷却壁技术的进展及其在宝钢的应用

从结构、材料、冷却方式和壁厚等方面介绍了新日铁高炉用冷却壁的1～4代演变过程，同时简述了宝钢引进的第3代冷却壁制造技术及其应用概况。认为今后大型高炉冷却系统的设计会向冷却壁倾斜。     

Superplastic deformation and crystallization behavior of Cu54Ni6Zr22Ti18 metallic-glass sheet

Superplastic deformation and crystallization behavior of a Cu₅₄Ni₆Zr₂₂Ti₁₈ metallic glass were investigated. A maximum elongation of 650% was obtained at 733 K at 1 × 10⁻² s⁻¹ from the sheet fabricated by squeeze copper-mold casting method. At low strain rates, the strain-rate-sensitivity exponent value was close to 1, suggesting that Newtonian-like behavior governed the plastic flow. At a high strain rate around 10⁻² s⁻¹, a transition from Newtonian to non-Newtonian behavior took place with decrease in m value. Large strain hardening by crystallization occurred during the course of deformation. The strain hardening was found to be caused by crystallization according to the analyses of the relation of true stress vs. testing time, T-T-T diagram and DSC characteristics. The time periods up to the strain before strain hardening at 733 K for the Cu₅₄Ni₆Zr₂₂Ti₁₈ metallic glass were similar to that of the Zr₆₅Al₁₀Ni₁₀Cu₁₅ metallic glass at 696 K as 180–300 s (3–5 min). This coincidence could be explained by comparison of their T-T-T diagrams showing that the incubation times for crystallization of the Cu BMG at 733 K and for Zr BMG at 696 K are similar.     

提高垂直分模平锻枧前滚轮和凸轮寿命的技术措施

本文针对垂直分模平锻机前滚轮和凸轮在工作中经常损坏的问题,分析了影响其寿命的因素,并结合本厂的实践,提出了提高前滚轮和凸轮寿命的措施。     

一种制备纳米复合镀层的新方法

研究了一种制备纳米复合镀层的新方法--在直流电镀过程中对电镀液施加强磁场以代替机械搅拌来制备Ni/Al2O3纳米复合镀层,考察了镀层的结构,并对镀层性能进行了研究.结果表明,在强磁场下可以制得纳米复合镀层;与未加磁场的纯镍镀层相比,施加磁场后镀层的晶体结构发生了择优取向;当磁场强度为8T时,复合镀层的磨损率仅为纯镍镀层的25%,其耐蚀性与Q235钢相比提高56.3%,与纯镍镀层相比提高46.8%.强磁场对电镀液起到较好的搅拌作用,通过影响镀层中纳米微粒的含量,使镀层结构发生变化,进而影响镀层的性能.     

Life cycle analysis of sanitary landfill and incineration of municipal solid waste

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数控机床反爬行设计与控制方法研究

通过基本物理量的分析,介绍了影响数控机床爬行现象原因,提出了从其结构设计和使用中应采取的控制方法。