Loocking for chemical Etchant for welded alloys F51(Stainless Steel-duplex) - HR22(Hastalloy)
F51 Stainless Steel- duplex : Fe-bal ; Cr-22.5% ; Ni-5.3% and Mo-3.4%
HR-22 (Hastalloy): Ni-56.5% ;Cr-21.6% ; Mo-13% ; Fe-3.9% ; W2.8% ; Co-1.4%
I would like to know what kind of Etchants is better to reveal the micrstruture and particulary the melting and the HAZ aeras.
I have already used the following Ecthants solutions have already used these following solutions with bad results:
1) Glyceregia : 15 mL glycerol + 10 mL HCl + 5 mL HNO3 (immerse at room temperature)
2) Mixed acids : 15 mL HCl + 15mL HNO3 +15 mL acetic acids (immerse at room temperature)
3) HCl and Peroxide : equals parts HC, and H2O2 (immerse at room temperature)
Please can someone help me
Dear Kessein Eric Tillous
There are many recommended etchants for duplex stainless Weld explored in literatures according to required microstructural evaluation. The Balázs Varbai et.al., in their paper titled "Development and Comparison of Quantitative Phase Analysis for Duplex Stainless Steel Weld" summarized these different etchants types in table 1 and related text.
Article Development and Comparison of Quantitative Phase Analysis fo...
Dear Mohammed Hussein,
Thanks so much for your help.
Best regards
Kessein Eric Tillous
I recommend use electrolitic etching, you could make a test with:
1. 10 g oxalic acid and 90ml H2 O. Use at room temperature. Etch at 3–6 volts for 5–60 s
2. 40vol% HNO3 in water. Step 1: apply 1–1.2V for 2min. Step 2: apply 0.75V for 7min
3. 40g sodium hydroxide (NaOH) in 100g of distilled water. Etch at 1–3V for 5–60 s
please, confirm the results obtained for explore other alternatives.
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