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- 저자 : M. Amra (검색결과 1 건)
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M. Amra,S. R. Alavi Zaree,R. Dehmolaei 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
In the present work, the isothermal and cyclic oxidation behaviour of the 1.4742 ferritic and 310S austenitic stainlesssteels together with their dissimilar metal welds was investigated in the air with the humidity of 30 ± 3%. The welding wasperformed by the gas tungsten arc welding process utilizing ER310, ERNiCr-3, and ER446 filler metals. In the isothermalconditions, all the tested specimens followed the parabolic rate law. The maximum and minimum kpvalues were related tothe 310S-BM, 1.89 × 10−1 mg2cm−4 h−1, and the 1.4742-BM, 0.03 × 10−2 mg2cm−4 h−1, respectively. Due to the formationof a dense and thin mono-layer of Cr–Fe–Al spinel ((Cr,Fe,Al)3O4) on the surface of the 1.4742 stainless steel alongside thelowest coefficients of the thermal expansion (CTE), it exhibits a highly satisfying oxidation resistance in both isothermal andcyclic conditions. In the cyclic conditions, except for the 1.4742-BM, the other specimens encountered the oxide scale crackingand spallation. The large CTE mismatch between the underlying 310S-BM, -BMS, and ER310-WM with the multi-layerchromia (Cr2O3) and Cr–Mn spinel ((Cr,Mn)3O4) oxide scale caused extensive spallation and mass loss in cyclic conditions.The ERNiCr-3-W in comparison with the two other weldments, by reducing the thermal expansion mismatch between theadjacent underlying metals and the better oxidation resistance of the nickel-base ERNiCr-3-WM, showed better oxidationresistance in both isothermal and cyclic conditions.
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