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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Stress corrosion cracking susceptibility of friction stir welded AA7075-AA6056 dissimilar joint
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Stress corrosion cracking susceptibility of friction stir welded AA7075-AA6056 dissimilar joint

机译：搅拌摩擦焊接AA7075-AA6056异种接头的应力腐蚀开裂敏感性

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摘要

Two aluminium alloys. AA7075 and AA6056, were friction stir welded, with the AA7075 alloy placed on the advancing side of the welding tool. Microstructural observations revealed the development of a recrystallised fine-grained weld nugget, with two different grain sizes, resulting from the two different base materials. Slow strain rate tensile (SSRT) tests in air have shown that the weld nugget is marginally overmatched in the weldment, and the fracture occurred in the relatively weaker thermo-mechanically affected zone/heat affected zone (TMAZ/HAZ) of the AA6056 alloy. SSRT tests in 3.5 percent NaCl solution at a nominal strain rate of 10~(-6)s~(-1) have shown that this dissimilar weldment is not susceptible to stress corrosion cracking (SCC) under these test conditions. Also in this case fracture was observed in the TMAZ/HAZ of the AA6056 alloy, with a behaviour very similar to that observed in the tests in air. However, at a still lower nominal strain rate, 10~(-7) s~(-1), the TMAZ/HAZ region of AA7075 alloy was found to be susceptible to SCC, exhibiting intergranular fracture. As a whole it is concluded that though the weld nugget is resistant to SCC, the TMAZ/HAZ region of AA7075 in the weldment is prone to SCC in 3.5 percent chloride solutions at nominal strain rate levels in the order of 10~(-7)s~(-1).
机译：两种铝合金。将AA7075和AA6056摩擦搅拌焊接，并将AA7075合金放置在焊接工具的前进侧。显微组织观察表明，由于两种不同的基础材料，导致了具有两种不同晶粒尺寸的重结晶细晶粒焊点熔核的发展。空气中的慢应变速率拉伸（SSRT）测试表明，焊缝中的熔核略微过匹配，并且断裂发生在AA6056合金相对较弱的热机械影响区/热影响区（TMAZ / HAZ）中。在标称应变率为10〜（-6）s〜（-1）的3.5％NaCl溶液中的SSRT测试表明，这种异种焊件在这些测试条件下不易受到应力腐蚀开裂（SCC）的影响。同样在这种情况下，在AA6056合金的TMAZ / HAZ中观察到断裂，其行为与在空气中的测试中观察到的行为非常相似。然而，在仍然较低的标称应变率10〜（-7）s〜（-1）时，发现AA7075合金的TMAZ / HAZ区域易受SCC影响，表现出晶间断裂。总体而言，可以得出以下结论：尽管焊核具有抗SCC的能力，但在3.5％的氯化物溶液中，AA7075的TMAZ / HAZ区域在标称应变率等级为10〜（-7）的情况下仍易于产生SCC。 s〜（-1）。

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