双金属复合管制备及性能分析

发布时间：2018-02-17 02:30

本文关键词： 双金属复合管挤压成型动电位极化电化学阻抗金相组织　出处：《西北大学》2015年硕士论文　论文类型：学位论文

【摘要】：双金属复合管是通过一定变形或连接技术使两种不同材质的金属管紧密结合在一起的一种新型的复合管材,相比于传统的单一金属管材,双金属复合管充分利用了两种管材的优良性能,弥补了它们的不足。不仅具备了高强度、耐腐蚀、耐磨损的性能,同时又降少了稀有、贵重金属的使用量,大大降低了成本,作为更理想的管材替代品被广泛的应用于石油、化工、建筑、电力等行业。本文主要研究容如下：1、通过压力机得到了最大挤压成型力,以确定装置中丝杠与螺母的设计强度,并据此设计了一套双金属复合管挤压成型装置。利用该装置成功地制备出了长为2m的双金属复合管坯；2、设计了拉脱实验,测试了双金属复合管的基管与衬管之间的结合强度,并通过与有关行业规定的结合强度要求对比,表明按照不同尺寸的挤压模具所制备出的双金属复合管的结合强度能分别满足不同行业的标准要求;3、利用动电位极化法和电化学阻抗法,测试了塑性变形量对双金属复合管的基管和衬管材料抗腐蚀性能的影响。结果分析得出,随着变形量的增大,基管和衬管材料的抗腐蚀性能会迅速降低,腐蚀速率也相应的加快。因此,在复合管的成型过程中,衬管和基管的变形量都应该控制在适当的范围内；4、利用金相显微镜观察了不同拉伸变形量基管材料的金相组织。结果显示,随着拉伸变形量的增加,基管材料金相组织中的晶粒发生细化、被拉长拉断等现象,同时晶界也随之增多,这样会使腐蚀介质与晶界的接触面积增加,导致材料更容易被腐蚀。
[Abstract]:Double metal composite pipe is made of two different materials of metal tube combined with a new type of composite pipe together by certain deformation or connection technology, compared to the traditional single metal pipe, double metal composite pipe to make full use of the excellent properties of the two kinds of pipes, to compensate for the lack of them. Not only have the high the strength, corrosion resistance, resistance to abrasion, but also reduced the amount of rare and precious metals, greatly reducing the cost, as a more ideal substitute pipe is widely used in petroleum, chemical, construction, electric power and other industries. In this paper, the main research contents are as follows: 1, through the maximum extrusion press the forming force, to determine the design strength of screw rod and the nut of the device, and designs a set of double metal composite pipe extrusion molding device. The device was successfully prepared for double metal composite tube 2m; 2, design Pull off test, the bonding strength between the clad pipe and the base pipe liner test, and combined with the relevant provisions of the industry strength contrast, show strength can respectively meet the requirements of different industries with different sizes according to the standard of extrusion die made of double metal composite pipe prepared; 3, the potentiodynamic polarization method and electrochemical impedance method, the influence of corrosion on plastic deformation of double metal composite pipe base tube and a liner material resistance were tested. The results show that with the increase of deformation, corrosion resistance of the base tube and the liner material will decrease quickly, the corrosion rate also accelerated. Therefore, in the forming process of composite pipe, the deformation of the liner and the base pipe should be controlled in a proper range; 4, to observe the microstructure of different tensile deformation of base tube materials by metallographic microscope. The results showed that with the pull With the increase of tensile deformation, the grain size in the metallographic structure of the base material is refined, elongated and broken. Meanwhile, the grain boundary also increases. This will increase the contact area between the corrosive medium and the grain boundary, which will lead to corrosion of the material.

【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE973

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