脉冲电场作用下SiCp/2014颗粒增强铝基复合材料的制备

介绍了一种新的制备颗粒增强铝基复合材料的方法，对处于熔点以上的铝液及SiCp颗粒施加一定时间的电脉冲，观察其凝固组织，发现增强颗粒分布均匀，基体合金晶粒细小，致密度正常，强度，耐磨性较高，该 方法是一种简单易行的制备颗粒增强铝基复合材料的新方法。     

09CuPCrNiMoNb耐候钢连续冷却转变及热轧双相化的研究

采用热膨胀法结合金相分析建立了09CuPCrNiMoNb耐候钢未变形和变形奥氏体的连续冷却转变曲线(CCT曲线)。试验钢变形奥氏体的CCT曲线具有较宽的铁素体析出区可作为“速度窗口”；同时，在铁素体．贝氏体区与珠光体转变区之间有一半开口型奥氏体稳定区，可作为“卷取窗口”，以上特点为试验钢热轧双相化提供了条件。根据变形奥氏体的CCT曲线提出了试验钢热轧双相化工艺，并在热模拟试验机上进行了热轧双相化模拟，获得了双相组织。     

挤压铸造模具材料的选用及热处理

介绍挤压铸造各种合金对模具材料的性能要求,在挤压铸造生产中模具材料的选用情况,目前国内外新型模具材料的研究进展以及模具的热处理情况.     

0Cr13Ni5Mo+Q345异种钢焊接工艺

介绍了一种新型焊接材料SW—309L超低碳不锈钢药芯焊丝用于0Crl3Ni5Mo Q345异种钢焊接。从母材性能、焊接材料的选择、焊接工艺评定等方面予以详细地分析和验证。     

超超临界锅炉用SA-335P92钢的焊接工艺性能研究

通过铁研试验及热模拟试验等对超超临界锅炉用SA-335P92钢的焊接性进行了研究.铁研试验表明,材料焊前钨极氩弧焊时预热温度≥150℃,焊条电弧焊和埋弧焊时预热温度≥200 ℃可以保证焊接不出现裂纹.通过焊缝粗晶区冲击试验,确定了合理的焊接热处理规范.进行了相应的使用焊接性试验,给出了SA-335P92材料的焊接工艺要点.     

Oblique Y-groove cracking test of the welding cold cracking susceptibility of domestic X-70 pipeline steel

“Gas Transmitting From West to East Project“ is significant.it should ensure the welding quality and safety of pipeline.The task is very arduous to guarantee the quality of the projcet in the condition of long line.complex weather and geolgy features.in this paper,the welding cold cracking susceptibility of domestic X-70 pipeline steel adopted by the project, which is one of the most interesting questions of welding quality about petrol pipeline,was studied by means of oblique Ygroove cracking test.The crack ration of surface and section was tested under the conditions of different welding materials and preheat temperature.The thickness of plate stell was 14.7mm and 10.3mm.The results reveal that X-70 pipeline steel has good crack resistance.The research has important value for the construction of large-scale pipeline engineering and the application of domestic X-70 pipeline steel.     

热模钢的脆性与热疲劳测定

本文阐述了热模钢的脆性与热疲劳测定方法,比较了常规热处理试样与渗猛处理试样的脆性行为和热疲劳特性。经金相观察、硬度测定、扫描电镜的电子探针和能谱分析、X射线衍射分析及声发射、热疲劳等试验,结果表明:渗锰试样的脆性低于常规处理试样,其耐热疲劳性则高于常规热处理试样。     

宝钢钢管全浮动芯棒连轧工艺的技术进步

全浮动芯棒连轧管生产线工艺的突出问题是钢管存在“竹节”现象和壁厚均匀度差。围绕提高钢管壁厚均匀度和消除“竹节”现象,进行持续的工艺技术改进,通过改善芯棒润滑条件,自主开发张力减径机非传统孔型,开发大规格孔型和高铬钢产品,提高生产线工艺自动控制水平等,使该生产线继续发挥能力,为用户提供高精度、高钢级的产品。     

Hydrogen effects on the passive film formation and pitting susceptibility of nitrogen containing type 316L stainless steels

The effects of hydrogen on the passivity and pitting susceptibility of type 316L stainless steels have been investigated with alloys containing different nitrogen contents (0.015, 0.198 and 0.556 wt.% N). The study revealed that electrochemically pre-charged hydrogen significantly reduced the pitting resistance of alloys conatining 0.015 and 0.198 wt.% nitrogen contents. In alloy with highest nitrogen content (0.556 wt.% N), an increase in the passive film current density with hydrogen was observed without affecting breakdown potential. Auger electron spectroscopy (AES) analysis of the passive film indicated the presence of nitrogen in the passive film. On other hand, for hydrogen charged samples, nitrogen was found to be significantly less in the passive film. In Electrochemical impedance spectroscopy (EIS) measurement, the decrease in semi-circle radius of Nyquist plot, and the polarization resistance, R_P associated with the resistance of the passive film was observed with hydrogen, indicating that hydrogen decreased the stability of the passive film. The present investigation indicated that precharged hydrogen deteriorated the passive film stability and pitting corrosion resistance in these alloys, and the increase in nitrogen content of the alloy offsets the deleterious effect of precharged hydrogen.     

Improvement of wear resistance of AZ31 and AZ91HP by high current pulsed electron beam treatment

The surface modification of magnesium alloys （AZ31 and AZ91 HP） was studied by a high current pulsed electron beam（HCPEB）. The results show that the cross-sectional microhardness of treated samples increases not only in the heat affected zone（ HAZ）, but also beyond HAZ, reaching over 250μm. This is due to the action of quasi-static thermal stress and the shock thermal stress wave with materials, which result in its fast deformation on the surface layer and so increases microhardness. For the AZ91HP alloy, a nearly complete dissolution of the intermetallic phase Mg17Al12 is observed, and a super-saturated solid solution forms on the re-melted surface, which is due to the solute trapping effect during the fast solidification process. Measurements on sliding wear show that wear resistance is improved by approximately 5.6 and 2.4 times for the AZ31 and AZ91HP respectively, as compared with as-received samples.