Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1571100 | Materials Characterization | 2014 | 6 Pages |
Abstract
The 225 °C isothermal transformation of a high-nitrogen austenite with Fe-2.71 wt.% N was investigated by means of electron microscopy. It was found that the transformation products were composed of ultrafine α-Fe and γâ²-Fe4N plus retained austenite γ, which were in two types of morphologies, namely, (i) with the retained austenite patches dispersed among the (α-Fe + γâ²-Fe4N) packets and (ii) with the ultrafine α-Fe and γ/γâ²-Fe4N laths interwoven with each other within a single bainitic packet. A cube-cube orientation relationship between the γ (austenite) and γâ²-Fe4N, and a near Greninger-Troiano (G-T) one between the γ (austenite) and the bainitic α-ferrite were detected. The morphology, orientation relationship and high hardness (> 1000 HV) of the transformation products indicated that the isothermal transformation of the high nitrogen austenite was analogous to a bainitic one.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Dongling Jiao, Chengping Luo, Jiangwen Liu, Guoqing Zhang,