The Effect of Composition on the Scaling of Iron-Chromium-Nickel Alloys Subjected to Cyclic Temperature Conditions

Abstract

The scaling behavior of a number of iron-chromium-nickel alloys has been examined under cyclic conditions involving 15 min heating in air, followed by 5 min air cooling. The results for test temperatures of 1400, 1600, and 1800 F permit the mapping of alloy compositions in terms of ability to resist scaling or flaking of their oxide films. While nearly all compositions are satisfactory at 1400 and 1600 F, scaling is pronounced at 1800 F for alloys containing less than 35 per cent nickel and less than about 20 per cent chromium at the low end of the nickel range and less than about 15 per cent chromium at the high end of the range.