330Cb alloy (Fe35Ni18Cr1Nb2Si) oxidation study between 800 and 1000 °C

Abstract

The 330Cb alloy (Fe-35Ni-18Cr-1Nb-2Si) has been oxidized, in air, in the 800-1000 8C temperature range. Results show the formation of a chromia layer acting as a good diffusion barrier under isothermal conditions. Nevertheless, some oxide scale spallation is generally observed after cooling to room temperature. A fine and adherent chromia scale is only obtained after short-term oxidation at 800 8C. In this case, the scale is probably too fine to expect a protection against carburization. At 900 8C we have observed that the scale spalled off on the niobium rich alloy areas. At 1000 8C the scale adherence is very bad. This study shows that the oxide scale adherence is decreased when the 330Cb alloy oxidation duration is increased.

Water Vapour Effect on Ferritic 4509 Steel Oxidation Between 800 and 1000 °C

“…A recent paper has discussed the niobium and silicon effects on a 330Cb austenitic steel high temperature oxidation [36]. Its influence was negligible on the oxidation process but it was observed, that silicon and niobium have a good affinity to each other.…”

Influence of atmosphere on high‐temperature oxidation of Fe‐Cr‐Si model alloy

“…Then chromia‐forming alloys with additional silicon are used. However, former studies have shown that the oxidation in air leads to a poorly adherent chromia scale and did not permit a continuous silica scale formation even though the alloy contains about 2 wt% silicon . One way to act on the oxide scale formation consists of modifying the gaseous environment, using inert gases .…”

“…However, former studies have shown that the oxidation in air leads to a poorly adherent chromia scale and did not permit a continuous silica scale formation even though the alloy contains about 2 wt% silicon. [4][5][6] One way to act on the oxide scale formation consists of modifying the gaseous environment, using inert gases. [7] Previous works have shown that, on an austenitic steel, a protective silica scale formation is promoted by low-oxygen gaseous environments and a high-alloy silicon content.…”

Role of Na2CO3 on an AISI 330 austenitic stainless steels oxidation at 900°C

“…The HR‐120 alloy showed the poorest cyclic‐oxidation resistance, due to bad scale adhesion and the tendency of iron (33 wt%) to oxidize. Former studies have shown that the oxidation of the AISI 330Cb alloy at 900°C in the air lead to a poorly adherent chromia scale and did not permit a continuous silica scale formation even though the alloy contains about 2 wt% silicon . Then, the protection against corrosive environments was not ensured.…”

“…Former studies have shown that the oxidation of the AISI 330Cb alloy at 900°C in the air lead to a poorly adherent chromia scale and did not permit a continuous silica scale formation even though the alloy contains about 2 wt% silicon. [7][8][9] Then, the protection against corrosive environments was not ensured. One way to act on the oxide scale formation consists in modifying the gaseous environment, using inert gases.…”