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Dear ironic metallurgist, Thanks for your advise. You mentioned that " I have to wonder when I see balancing holes 180° opposite each other ". Would you please explain a little bit more? Thanks.

Dear kingnero, Thanks for your advise.

Dear ironic metallurgist, Thanks for your comment. But, what is your reason for this comment? The length of the crack?

Tmoose, Thanks for your comments. The picture is attached. The cracks initiated from the balance holes on the surface of the disk. Some cracks are through thickness (i.e., the depth of some cracks is about 4 cm!). The cracks are probably formed due to thermal fatigue as a result of start up...

Thanks EDS and ironic metallurgist for your comments.

Thanks EDS and ironic metallurgist. Yes, the part is critical. But, the exact materials is not available. So, we have to use a similar material. 4140 has similar composition to that of A471-class 12. But, as you suggested, before welding, I think we should heat treat 4140 (Quench and tempering)...

Hi to All, We are going to repair welding of a cracked compressor disk. The cracks are formed due to low cycle thermal fatigue. The disk material is ASTM A471 class 12 (Fe-0.45C-0.8Mn-1Cr-0.5Mo). We should qualify the welding procedure before welding on the disk. However, A471 is not available...