Review on influence,removal and chemical analysis of sulfur in nickel-based superalloy
The content of sulfur in nickel-based superalloy significantly affects its high temperature proper-ty.However,there are few reports about this in China especially the excellent oxidation resistance of ul-tra-low sulfur.Meanwhile,the corresponding smelting and quality monitoring system have been not estab-lished.Therefore,the related studies at abroad were systemically summarized in this paper.Firstly,the influences of sulfur on high temperature property especially high temperature mechanical property and high temperature oxidation resistance were introduced.It was found that when the mass fraction of sulfur was reduced to 0.3 μg/g,the oxidation layer was stably adhered and the oxidation resistance was improved sig-nificantly.Then,the approaches of inhibiting sulfur were introduced,including the decrease of sulfur con-tent by hydrogen reduction,the addition of rare earth elements,and desulfuration with calcium oxide.The content of sulfur could be greatly reduced by the former method,but the sample size was usually small,which was mainly used for experiment research.The latter two methods could effectively remove sulfur and there were some reports on industrial production.Finally,the chemical analysis methods of sulfur were summarized.The isotope dilution mass spectrometry and glow discharge mass spectrometry have been widely used for the detection of ultra-low sulfur.Moreover,secondary ion mass spectrometry,glow discharge mass spectrometry and glow discharge optical emission spectrometry have been widely used for the distribution analysis of sulfur.
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