분말야금 스테인리스 스틸의 산화특성에 미치는 조성 및 조직변화의 영향
The Effects of Composition and Microstructure Variation on the Oxidation Characteristics of Stainless Steels Manufactured by Powder Metallurgy Method
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As well-known wrought stainless steel, sintered stainless steel (STS) has excellent high-temperature anticorrosioneven at high temperature of 800ºC, and exhibits good corrosion resistance in air. However, when temperatureincreases above 900ºC, the corrosion resistance of STS begins to deteriorate and dramatically decreases. In this study,the effects of phase and composition of STS on high-temperature corrosion resistances are investigated for STS 316L,STS 304 and STS 434L above 800ºC. The morphology of the oxide layers are observed. The oxides phase and compositionare identified using X-ray diffractometer and energy dispersive spectroscopy. The results demonstrate that thebest corrosion resistance of STS could be improved to that of 434L. The poor corrosion resistance of the austeniticstainless steels is due to the fact that NiFe2O4 oxides forming poor adhesion between the matrix and oxide film increasethe oxidation susceptibility of the material at high temperature.
Abstract
As well-known wrought stainless steel, sintered stainless steel (STS) has excellent high-temperature anticorrosioneven at high temperature of 800ºC, and exhibits good corrosion resistance in air. However, when temperatureincreases above 900ºC, the corrosion resistance of STS begins to deteriorate and dramatically decreases. In this study,the effects of phase and composition of STS on high-temperature corrosion resistances are investigated for STS 316L,STS 304 and STS 434L above 800ºC. The morphology of the oxide layers are observed. The oxides phase and compositionare identified using X-ray diffractometer and energy dispersive spectroscopy. The results demonstrate that thebest corrosion resistance of STS could be improved to that of 434L. The poor corrosion resistance of the austeniticstainless steels is due to the fact that NiFe2O4 oxides forming poor adhesion between the matrix and oxide film increasethe oxidation susceptibility of the material at high temperature.
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