Effect of special grain boundary on hot corrosion path in Incoloy825 alloy
Source abstract
Abstract
Incoloy825 alloy is a Ni–Fe–Cr corrosion resistant alloy, which is widely used in oil and gas pipelines, heat exchangers, chemical plants and boiler pipelines. In the application environment of high-temperature and high-pressure sulfur-containing and chlorine containing steam pipelines, the pipeline surface is easy to deposit salt film, resulting in high-temperature hot corrosion, which requires the alloy to have excellent sulfur and chlorine corrosion resistance. The hot corrosion behavior of Incoloy825 alloy was investigated by using Na2SO4 + NaCl molten salt at 950 °C. The results show that the hot corrosion products mainly include (Cr,Fe)2O3, NiO, NiCr2O4, FeCr2O4, NiFe2O4 and (Fe,Ni)S2. Sulfur and chlorine elements in molten salt act as catalysts in vulcanization and chlorination reactions. The hot corrosion path penetrates along the random high-angle grain boundary, and the special grain boundary can block the penetration path of hot corrosion. Chromium mainly precipitates along the random high-angle grain boundary. The special grain boundary can inhibit the precipitation of chromium, so as to reduce the combination probability of sulfur and chlorine with chromium. Σ11 boundary, Σ5 boundary and incoherent Σ3 twin boundary do not block the corrosion path, and coherent Σ3 twin boundary plays a key role in blocking the corrosion path. For alloys with low stacking fault energy, taking advantage of the characteristics that their microstructure contains a large number of annealing twins, increasing the proportion of special grain boundaries is an effective means to improve their hot corrosion resistance.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High-Temperature Coating Behaviors · High Temperature Alloys and Creep · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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