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材料工程  2015 

V对MGH956合金TIG原位合金化焊接接头组织与性能的影响

DOI: 10.11868/j.issn.1001-4381.2015.01.011, PP. 59-65

Keywords: MGH956合金,原位合金化焊接,V,组织,性能

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Abstract:

为改善MGH956合金TIG焊焊缝的组织与性能,采用原位合金化方法对该合金进行TIG焊接.对比不同含量V的填充材料对焊缝组织与性能的影响,并讨论了V的作用机理.OM和SEM结果表明填充材料中添加不同含量的V后,组织出现了不同程度的细化及均匀化,当wV=1.5%时,晶粒最细、尺寸均匀,同时焊缝中的气孔量有所减少;对焊缝中的颗粒进行物相鉴定可知,除了有YAlO3,TiC和TiN颗粒生成外还有(Ti,V)C复合颗粒生成.由TEM观察显示wV=1.5%时,焊缝内的碳化物颗粒与焊缝基体结合良好,且wV=1.5%时,接头强度最高,并实现了接头断裂方式由完全脆性断裂转变为韧性断裂.

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