抗晶间腐蚀奥氏体不锈钢的晶界工程

Sensitization by chromium depletion due to chromium carbide precipitation at grain boundaries in austenitic stainless steels can not be prevented perfectly only by previous conventional techniques, such as reduction of carbon content, stabilization-treatment, local solution-heat-treatment, etc. Recent studies on grain boundary structure have revealed that the sensitization depends strongly on grain boundary character and atomic structure, and that low energy grain boundaries such a~ coincidence-site-lattice (CSL) boundaries have strong resistance to intergranular corrosion. The concept of grain boundary design and control has been developed as grain boundary engineering (GBE). GBEed materials are characterized by high frequencies of CSL boundaries which are resistant to intergranular deterioration of materials, such as intergranular corrosion. A thermomechanical treatment was tried to improve the resistance to the sensitization by GBE. A type 304 austenitic stainless steel was cold-rolled and solution-heat-treated, and then sensitization-heat-treated. The grain boundary character distribution was examined by orientation imaging microscopy (OIM). The intergranular corrosion resistance was evaluated by electrochemical potentiokinetic reactivation (EPR) and ferric sulfate-sulfuric acid tests. The sensitivity to intergranular corrosion was reduced by the thermomechanical treatment and indicated a minimum at a small roll-reduction The frequency of CSL boundaries indicated a maximum at the small reduction. The ferric sulfate-sulfuric acid test showed much smaller corrosion rate in the thermomechanical-treated specimen than in the base material. A high density of annealing twins were observed in the thermomechanical-treated specimen. The results suggdst that the therrmomechanical treatment can introduce low energy segments in the grain boundary network by annealing twins and can arrest the percolation of intergranular corrosion from the surface. The effects of carbon content and other minor elements on optimization in grain boundary character distribution (GBCD) and thermomechanical parameters were also examined during GBE.     

爆破震动危害的控制

通过对本钢南芬露天铁矿新建的碎石站前方5．7m处进行的总孔数为51个,总装药量为1667kg的中深孔爆破,成功地保证了碎石站前侧立柱的完整无损的爆破工程实例进行分析,论述了逐孔起爆、预裂爆破和空气间隔装药的降震效果。     

2011年“我爱祖国海疆”全国青少年建筑模型总决赛知识竞赛题答案

1.建筑模型是一种以三维的立体的形式,采用纸、木材、塑料等多种材料,包括采用当代高科技材料,利用电脑机械和手工技术,形象具体地表现出建筑设计思想和效果的模型。2.首届"走向新世纪全国青少年建筑模型竞赛"于1999年6月举办。后于2007年并入"我爱祖国海疆"全国青少年航海建筑模型竞赛。     

微小型薄壁内沟槽铜管旋压缩径数值模拟

文章以有限元分析软件MSC.Marc为平台,建立了微小型薄壁内沟槽铜管钢球高速旋压缩径成形的三维弹塑性有限元模型,对缩径过程的变形机理、应力应变分布和受载情况进行了分析;同时,进行了成形过程实验研究。模拟与实验结果表明,沟槽底部的等效应力应变远大于齿形和沟槽管外表面,钢球与沟槽管接触区受三向压应力作用;等效应变沿轴向呈分层分布,沿周向呈间隔分布;轴向进给速度过大,沟槽管容易出现扭曲变形,轴向拉拔力和钢球承受载荷也相应增大。模拟结果揭示的规律与实验结果相一致。该研究有助于改进缩径工艺,提高加工效率。     

基于超细膨润土粉体的润滑脂的制备及性能研究

研究了不同的球磨方法制备超细膨润土粉体的可行性。并对超细膨润土润滑脂和传统膨润土润滑脂的综合性能进行了对比研究。结果表明,砂磨法制备的超细膨润土平均尺寸为250 nm,且分布较窄,超细膨润土能够保持良好的晶格结构。超细膨润土润滑脂的机械稳定性、胶体稳定性、抗磨减摩性能均优于传统膨润土润滑脂。     

超滤过程中膜污染控制和膜清洗的研究进展

超滤技术应用过程中出现膜污染,致使膜通量降低.通过对污染物的成分、膜污染的形成过程,膜材料、原料液、操作条件对膜污染的影响分析,论述了通过原料液预处理、膜材料和膜组件改进、操作条件控制和操作过程控制减轻膜污染,利用物理清洗和化学清洗尽可能恢复膜通量.     

一种改进的数学形态学图像滤波算法

设计了一种多结构元素复合滤波结构,采用两级级联结构,每级运用两种结构元素分别对图像作开闭和闭开运算,运算中间结果以图像熵比值为融合准则进行合并。该算法在抑制图像噪声污染的同时,保留图像的边缘,不损伤图像的细节质量。仿真证明,采用该算法滤波后,反映了图像细节质量的统计参数图像标准差和绝对平均梯度比传统的均值和维纳滤波均高。     

压电换能器装配液压扭矩扳手设计

针对压电换能器传统装配中存在的扭矩不稳定和大批量装配时不能保证统一性与准确性的问题,分析了液压扭矩扳手结构特点及其关键设计,提出了压电换能器装配液压扭矩扳手的具体方案。研究结果表明,该方案实现了大批量压电换能器装配扭矩恒定的要求,也为大批量恒扭矩装配压电换能器奠定了基础。     

2019 湖北省造纸行业协会年会暨湖北省造纸协会第五届（学会七届）理事会第五次会议在湖北省南漳县召开

2019年12月15—17日,2019 湖北省造纸行业协会年会暨湖北省造纸协会第五届（学会七届）理事会第五次会议在湖北省襄阳市南漳县召开。     

坚守行业三十载 充满信心谈发展——访维美德中国区副总裁范泽

一副金丝眼镜,脸上始终洋溢着微笑,言谈举止间透露着从容自信,这就是维美德中国区副总裁范泽给本刊记者留下的第一印象。他谦虚地介绍自己是一位自学成才的“非专业”从业者,从西安交通大学法律专业硕士毕业后,机缘巧合进入造纸行业,自此,在造纸行业默默坚守、兢兢业业工作30年,无怨无悔,将自己的全部智慧和心血奉献给了造纸事业。