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Grain Type post weld in Grade 1 titanium

Grain Type post weld in Grade 1 titanium

Grain Type post weld in Grade 1 titanium

(OP)
Hi Folks,

I have attached an old image of a butt joint laser weld from thin sheet grade 1 titanium . The quality of the image is poor however I am slighty confused as to what the grain structure and type of this sample is post weld. I can see both alpha and beta phases present which should not be considering grade of material - is this correct?

Care to comment?
 

RE: Grain Type post weld in Grade 1 titanium

If this is Grade 1 CP titanium, my technical references indicate the resultant microstructure of the butt weld  fusion zone should be acicular alpha-phase within  large previously formed beta-phase grains. However, the beta-phase will transform back to alpha-phase upon cooling. I see relatively coarse grains in the vicinity of the weld fusion zone but beyond this observation, I cannot delineate phase constituents.
If you are actually seeing beta-phase constituents you have a contaminant (iron) that was introduced.

 

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