【作者】 陈思杰；

【导师】 井晓天；

【作者基本信息】 西安理工大学 ， 材料学， 2003， 硕士

【摘要】 本文综述了瞬时液相扩散连接工艺的研究成果，用20、TP304H和T91锅炉钢管进行了大量的工艺试验，主要目的是分析工艺参数和中间层对接头组织性能的影响，确定合适的连接工艺。连接采用感应加热，在大气环境下施焊，氩气保护。接头质量用室温力学性能和金相组织评定。 研制出了一种复合中间层，提出了TLP连接的新工艺-即短时高温瞬时液相扩散连接工艺。分析了TLP连接接头的显微组织、力学性能和元素分布；确定出了合适的连接工艺参数。 实验结果表明，中间层合金成分及其性能对瞬时液相扩散连接来说是至关重要的，良好的接头质量取决于中间层的成分。铁基复合中间层适合管道的TLP连接，接头没有硬化相，成分和基体相似，在合适的工艺参数下，可以获得良好的性能。通过改变工艺参数和中间层成分，可以完成不同种类合金的TLP连接。研究出的最佳工艺如下： 1.20钢：连接温度1210℃，中间层为BNi₂，等温时间4分钟，压力 西安理工大学硕士学位论文6Mp尽。或连接温度1 230oC，中间层为BFeNISIB铁镍合金，等温时I’ed4分钟，压力SMPa。 2.TP304H:连接温度1220℃，中间层为BNiZ，等温时间4分钟，压力6MPa。或连接温度1 230℃，中间层为AFeNISIB铁镍合金，等温时间4分钟，压力SMPao 3.Tgl:连接温度1250℃，中间层为BFeNisiB合金，等温时间4分钟，压力SMPa。或用短时高温新工艺，1 265℃保温30秒，等温温度1 230℃，等温时间3分钟，中间层为BFeNISIB铁镍合金，压力SMPa。更多还原

【Abstract】 This paper deals with process research results concerning Transient Liquid-Phase joining process. Tests have been carried out to study TLP bonding with 20.TP304H and T91 steel pipes in an argon atmosphere.The aim of this study is to find the effect of interlayer on microstructure and mechanical properties of joint. A series of bonding conditions and heat treatments are used to develop the optimum joint microstructure. The joints produced have been characterized by metallographic examination and tensile tests at room temperature.A composite interlayer based on Fe has been obtained. One approach is presented for TLP jointing in this paper. It has a short time at higher temperature than the isothermally solidified temperature. The microstructures and properties, as well as the element distribution of the joints has examined. TLP bonding parameter is determined. The experiment finds that one of the most important consideration for producing a "good" joint will be its final composition which will depend on the interlay used. It has been shown an iron interlayer based on the Fe-Ni-B-Si system is a suitable material for use as a high-temperature interlayer for Transient Liquid-Phase joining of steel pipes. TLP bonding produced steel pipe joints, free from intermetallic precipitates and beingidentical in composition to that of the parent metal, proper mechanical is formed in the bonging seam under suitable conditions. Process parameters and interlayer design are quite flexible and can be varied to match with the particular requirements of a given alloy in a particular application. The optimum process has been obtained with the result shown in the following :1. 20 steel: Bond made at 1210℃ for 4min under 6MPa ,with BNi2 interlayer ;or bond made at 1230℃ for 4min under 8MPa ,with Fe-Ni composite interlayer2. TP304H: Bond made at 1220℃ for 4min under 6MPa with BNi2 interlayer ;or bond made at 1230℃ for 4min under SMPa ,with Fe-Ni composite interlayer3. T91: Bond made at 1250℃ for 4min under 8MPa ,with Fe-Ni composite interlayer; or made at 1265℃ for 30s and 1235℃ 3min under 8MPa.更多还原