Manufacturing Industry

Etching stainless steels for delta ferrite: color etching and electrolytic etching can help metallographically evaluate delta ferrite content.(TECH SPOTLIGHT)

Advanced Materials & Processes, February, 2007 by Hetzner, Dennis W.

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A methodology for calculating the approximate ferrite content in austenitic stainless steel welds was first described by Schaeffler in 1949. Subsequently, the original diagram was revised by DeLong, and later revised by the Welding Research Council several times (Fig. 1). [FIGURE 1 OMITTED] Based on the composition of the stainless steels being welded, a nickel and chromium equivalent of the weld metal is calculated using Equations 1 and 2.

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C[r.sub.eq.] = %Cr + 1.5 x %Si + %Mo + 0.5% x (%Ta + %NB) + 2 x %Ti + %(W + V + Al) (Eq. 1) N[i.sub.eq.] + %Ni + 30 x %Co + 0.5 x %Mn + ...

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Manufacturing Industry

Etching stainless steels for delta ferrite: color etching and electrolytic etching can help metallographically evaluate delta ferrite content.(TECH SPOTLIGHT)

Advanced Materials & Processes, February, 2007 by Hetzner, Dennis W.

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