A New Magnetic Nde Method In Inconel 600 Alloy

Cr concentration and the volume fraction in Inconel 600 alloy were accurately analyzed by the new magnetic method according to the magnetic properties of the ternary alloys. The depletion has a maximum at aging for 10 h at 973 K and diminishes with longer aging. Cr depletion below 10 wt. % was observed in the aging. After aging for 100 h the depletion remarkably recovers, but it definitely remains compared with the initial state. The depleted zone extends to 300 nm from the grain boundary. These results agree well with those of a previous analysis by scanning transmission electron microscope analysis. The new magnetic method, herein reported, for evaluation of chromium depletion has nondestructive evaluation characteristics.