Dear Martinos
As I said before, weld material is AWS A5.4 E347.16, and C composition of weld material is 0.06%.
That C content is not low in my opinion.
So, you think those globular particles are not NbC? or CrC?
Dear Martinos & EdStainless
Thank you for your reply.
I attach microstructure of other fail case (same condition as before, but solution annealing is for 3hours).
And welds is not 321, but it is 347.
There can not be TiCN as you said.
I think round shape particles in welds are reason for fail...
Dear all
I really appriciate your replies. Thank you for that.
And I attach microstucture solution annealing(1060C) for 2 hours after exposing 450C with A262E test picture in ZIP file.
Thank you in...
Dear EdStainless & Metengr
Sorry for cross post it, but I don't know hot to delet it.
Actually, I don't have much exprience in microstructure area.
If you give me your email address, I would like to show you microstructres of my test.
I know it is really hard to tell which one is CrC or TiCN...
Dear EdStainless
Thank you for your reply.
As I posted for Metengr, Composition of base material is C=0.047%, Cr=17.29%, Ti=0.358%.
Weld material is AWS A5.4 E347.16, and C composition of weld material is 0.06%.
And sensitized temperature is 450C, not 850-900C.
I'm sure what I saw in base...
Dear metengr
Thank you for your reply.
Composition of base material is C=0.047%, Cr=17.29%, Ti=0.358%.
Weld material is AWS A5.4 E347.16, and C composition of weld material is 0.06%.
So you think solution temperature is not appropriate?
I've had a exprimental test for 321 stainless steel plate and welds if chromium carbides of 321 stainless steel can be removed by solution annealing.
I chose specimens that thickness is 52t plates and welded as per ASME code.
And the specimens were exposed 450 deg for 4 hours to create chromium...
