采用BNi-2+40%BNi-5镍基混合钎料对316L不锈钢进行三种纤缝间隙的真空钎焊,通过光学显微镜、扫描电镜、X射线能谱仪及硬度计等研究了三种钎焊接头的显微组织、钎缝元素分布以及钎缝显微硬度.结果表明:316L不锈钢的钎焊接头主要由固溶体、连续共晶和金属间化合物及网状组织组成;随着钎缝间隙的减小,钎焊接头中金属间化合物的含量逐渐减小,接头元素、硬度分布更加均匀;当钎缝间隙为30 μm时,接头组织基本为固溶体,综合性能最好.
Vacuum brazing of 316L stainless steel with BNi-2+40%BNi-5 nickel-based mixed filler metal was carried out to obtain the joints with 3 kinds of brazing clearances.Microstructure of solder joints,dement distribution and microhardness of the joints were studied by means of optical microscopy,scanning electron microscopy,energy dispersive X-ray spectroscopy and microhardness testing.The results show that the joints were composed of solid solutions continuous,eutectic compounds and meshwork compounds.The amounts of intermetallic compounds decreased,the joint composition and hardness distribution were more uniform with the decrease of brazing clearance.Continuous microstructure of the joint with 30 μm brazing clearance was mainly solid solution,and the comprehensive properties were the best.
参考文献
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