ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Fe-Ni-Mn maraging alloys show discontinuous coarsening of fct θ-NiMn precipitatesalong prior austenite grain boundaries (PAGBs) during isothermal aging. Heavy cold rolling of asolution annealed Fe-10Ni-7Mn (wt. %) maraging alloy and subsequent aging treatment at 773 Kled to the formation of a nanostructured material. Hardness measurement and transmissionelectron microscopy were used to study the aging behaviour and microstructural evolution of thenanostructured alloy. At the early stage of aging, an ultrafine grained structure was observed withfine matrix precipitates. However, at later stages of aging, severe coarsening of precipitates wasfound. At that stage, a lamellar microstructure composed of finely precipitated ferrite laths andultrafine ferrite grains were identified. Coarse fct θ-NiMn precipitates were identified at theultrafine ferritic grain boundaries. Development of the coarsening reaction was found to increasethe ultrafine grained ferritic regions with prolonged aging
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.114.159.pdf
