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城市化日益发展的今天,建筑工程成为了城市建设中最不可或缺的组成部分。随着钢结构技术的不断完善,越来越多的建筑工程开始使用钢结构技术来进行施工与建设。对于钢结构本身来说,其与传统施工方式有着更多优势,但是必须要做好防腐处理,以免钢结构的性能受到影响。因此,本文将首先对钢结构腐蚀问题存在的危害以及腐蚀类型进行分析,随后着重对建筑钢结构防腐技术进行探析,以供参考。 相似文献
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介绍了高层钢结构在新立公司高钛渣项目中的应用.着重分析了结构方案布置、钢框架-支撑结构的受力特点、主要计算参数、关键设计控制点、转换结构桁架的受力特点,对类似工业建筑中采用高层钢结构设计,具有一定的指导意义. 相似文献
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用搅拌摩擦焊方法焊接了异种材料铝合金与低碳钢,分析了接头的截面形貌及力学性能.结果表明,当焊接工艺参数合适时,可以获得表面成形良好、无变形的铝合金与钢的对接接头和搭接接头.对于对接接头,金相分析表明,在焊缝横截面,低碳钢与铝合金呈较好的混合状态,在平行焊缝表面的平面内,两种材料呈交叠分布.力学性能试验表明,焊核内局部区域具有较高的显微硬度,可能是形成了钢与铝的金属间化合物,拉伸试样断裂在焊核区边缘偏低碳钢一侧.对于搭接接头,接合面处的钢呈形似"钳子"或弯钩状的分布,钢铆进了铝合金焊缝中,两种材料能有效地达到塑性结合,接头的抗剪切性能较好. 相似文献
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D. V. Lazurenko I. A. Bataev V. I. Mali E. A. Lozhkina M. A. Esikov V. A. Bataev 《The Physics of Metals and Metallography》2018,119(5):469-476
Features of the structure of a layered material welded by explosion of high-strength titanium alloy and tool roller steel with an intermediate layer of the structural low-carbon steel have been studied. The structural transformations occurring in materials upon their dynamic interaction have been analyzed. Particular attention is paid to the structure of vortex zones formed at the interfaces of billets of various steels, as well as structural steel and titanium-based alloy. The structural analysis methods made it possible to fix stable and metastable joints appearing upon the explosive welding of various metals. To reveal features of structural transformations caused by prolonged heating, billets of titanium alloy and structural steel were also joined by diffusion welding. It has been shown that, in the course of the diffusion welding process, a continuous layer of stable brittle intermetallic compounds is formed along the entire interface of the welded materials. In the explosively welded materials, the intermetallic phases are distributed locally and, thus, they have a weaker embrittlement effect. 相似文献
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通过金相和硬度试验,研究了25CrMnB履带钢不同部位组织与硬度的分布规律,对热轧25CrMnB履带钢出现冲裁断裂问题的原因进行了分析。结果表明,水冷样品比空冷样品硬度更高,且诱导齿处易出现硬度偏高的问题,断裂首先于诱导齿处发生。履带钢冲裁断裂的原因是出现了混晶组织、网状铁素体和粒状贝氏体组织,材料受力时在异常组织处形成应力集中,导致微裂纹萌生并扩展,引起履带钢冲裁时开裂。混晶组织与网状铁素体出现的原因是终轧温度过高。根据EDS分析结果,粒状贝氏体出现的原因主要是Mn和B元素微观偏析。 相似文献
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基于均匀设计的方法研究了不锈钢焊条的焊缝成形。通过数理统计给出了10种药皮材料及其交互作用对应于因变量焊缝成形的数学模型;也给出了每种药皮材料影响焊缝成形的趋势图。数学模型揭示出药皮材料对焊缝成形复杂影响的内在规律:①全部药皮材料对焊缝成形都有影响,但大部分为交互作用;②冰晶石X1、钛白粉X6的影响作用为平方项;③萤石X5对焊缝成形的影响为负相关,但它与云母 白土子X6的交互作用对焊缝成形的影响则为正相关。在趋势图上可以直观地看到各材料在不同的含量区间会对焊缝成形有不同的相关性影响:当电解锰含量X3分档次自低向高变化时,焊缝成形Y与钛铁X4的关系先是呈负相关而后转为正相关,而焊缝成形Y与白泥X7的关系先是呈正相关而后转为负相关。 相似文献
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采用金相显微镜和扫描电镜,对在磷酸铵溶液中失效的不锈钢球阀进行了宏微观形貌观察和金相组织分析;并采用光电直读光谱仪、能谱仪、红外碳硫分析仪和NHO分析仪对球阀材质和密封部位表面沉积物进行了表征分析。结果表明,球阀的失效是由于材质不合格和环境介质的共同作用所产生的电化学腐蚀和结垢引起的。此外,分析了不锈钢材料在磷酸铵溶液中的腐蚀机理,并提出防止球阀失效的相应对策。 相似文献
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异种材料焊接结构以其在力学性能、耐腐蚀性等多方面的综合优势,而被广泛应用到装备制造中.针对电机行业中的应用需求,采用连续驱动摩擦焊接实现了45钢和304不锈钢异种钢棒材的优质高效连接,通过工艺优化试验获得了成形以及性能良好的焊接接头.结果表明,在焊接界面处有碳化物层的形成,45钢侧有很薄的铁素体层出现,304不锈钢侧奥氏体晶粒发生了细化,但热影响区内晶粒发生粗化.焊态试样抗拉强度达到870 MPa,拉伸断裂在焊缝界面,为脆性断裂,但微观上有韧窝断裂和准解理断裂两种断裂机制. 相似文献
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通过对高锰钢夹钩座铸造缺陷产生的原因进行分析并进行工艺改进,逐步消除了高锰钢夹钩座的铸造缺陷,提高了铸件的外观质量,同时,降低了材料消耗,减轻了铸件清理过程中的劳动强度,提高了生产效率。 相似文献
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Yajuan Jin Ruifeng Li Zhishui Yu Yu Wang 《Journal of Materials Engineering and Performance》2016,25(4):1327-1335
Plasma arc brazing is used to join the AISI 304L stainless steel and galvanized steel plate butt joints with the CuSi3Mn1 filler wire. The effect of parameters on weld surface appearance, interfacial microstructure, and composition distribution in the joint was studied. The microhardness and mechanical tests were conducted to determine the mechanical properties of the welded specimens. The results indicated that good appearance, bead shape, and sufficient metallurgical bonding could be obtained when the brazing process was performed with a wire feeding speed of 0.8 m/min, plasma gas flow rate of 3.0 l/min, welding current of 100 A, and welding speed of 27 cm/min. During plasma arc brazing process, the top corner of the stainless steel and galvanized steel plate were heated and melted, and the melted quantity of stainless steel was much more than that of the galvanized steel due to the thermal conductivity coefficient difference between the dissimilar materials. The microhardness test results shows that the microhardness value gradually increased from the side of the galvanized steel to the stainless steel in the joint, and it is good for improving the mechanical properties of joint. The tensile strength was a little higher than that of the brazing filler, and the fracture position of weld joint was at the base metal of galvanized steel plate. 相似文献
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铸造金属耐磨材料研究的进展 总被引:2,自引:0,他引:2
符寒光 《中国铸造装备与技术》2006,98(6):2-6
详细介绍了耐磨材料奥氏体锰钢、低合金钢和白口铸铁的成分、组织、性能及其应用进展,还对耐磨钢结材料和耐磨铸造复合材料以及新开发的高硼铸造耐磨合金进行了评述,期待为科学选择耐磨材料提供参考。 相似文献