ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Heat treatment of the Fe-35Cr-21 Ni-6.7Al-0.3Zr alloy results in the formation of an alumina layer on its surface. The NiAl-based B2 phase particles in this alloy change their dispersion state according to the heat treatment conditions. Structural and hardness changes of the alloy were examined for specimens heat-treated at a temperature between 1323 and 1523 K for 0.3 to 54.0 ks followed by air cooling at a rate of 100 Ks−1. Three sizes of B2 phase particles were observed, i.e. particles of several micrometres, 100 to 300 nm and a few dozen nanometres; the thickness of the alumina layer on the surface increased with heating time. The particles of several micrometres disappeared from the near-surface region as the heat treatment proceeded, and instead finely dispersed B2 particles of 100 to 300 nm or a few dozen nanometres appeared after fast cooling from the heat-treatment temperature. Thus, the matrix hardness increased with heating time and heating temperature, since more fine particles were obtained.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00365193
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