Effect of Brazing Temperature on Tensile Strength and Microstructure for 304 Stainless Steel Plate-Fin Structure
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摘要: 对采用镍基钎料BNi-2的304不锈钢板翅结构进行真空钎焊试验,加工了304不锈钢板翅结构拉伸试样,进行拉伸试验。利用扫描电镜(SEM)对钎焊接头微观组织进行观察;利用能谱分析(EDS)对接头成分进行研究。讨论钎焊温度(Tb)对结构强度和微观组织的影响。研究结果表明,在1025～1100℃之间,随着Tb升高,硼元素扩散充分,导致结构强度增大,且钎焊接头区域各相分布均匀,Tb=1100℃较为合适;当Tb较低时(1030℃),在接头区域生产的脆性相较多,结构的强度较低;当Tb升高到1100℃时,接头中间区域生成了完全的固溶体组织,且钎角区域的组织变得均匀。Abstract: The vacuum brazing of 304 stainless steel plate fin structure was carried out,and the tensile tests were performed.The scanning electron microscope（SEM） and Energy-dispersive X-ray spectrometer（EDS）tests were carried out to reveal the microstructure and chemical components in the brazed joint.The effect of brazing temperature on tensile strength and microstructure for 304 stainless steel plate-fin structures was discussed.The results show that the tensile strength is increased with the brazing temperature increasing from 1025 to 1100℃.With the brazing temperature increasing,the boron is diffused more adequately,which increases the strength.The microstructure becomes more uniform with the brazing temperature increasing.Hence the brazing temperature is determined at 1100℃.When the brazing temperature is very low（1030℃）,more brittle phases are generated in the brazing joint,which decreases the strength.When the brazing temperature is increased to 1100℃,full solid solution is generated in the middle of joint,and the microstructure in the fillet becomes more uniform.
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