Evolution of precipitate coarsening reaction in a nanostructured Fe-Ni-Mn maraging alloy

Syamak Hossein Nedjad 2Mahmoud Nili Ahmadabadi 3Tadashi Furuhara 1Tadashi Maki 1

1. Kyoto University, Kyoto 606-8501, Japan
2. Sahand University of technology (SUT), Sahand New Town, Tabriz, Iran, Tabriz 51335-1996, Iran
3. University of Tehran (UT), North-Kargar, Tehran 14395-731, Iran

Abstract

Fe-Ni-Mn maraging alloys show discontinuous coarsening of f.c.t. θ-NiMn precipitates along prior austenite grain boundaries (PAGBs) during isothermal aging. Heavy cold rolling of a solution annealed Fe-10Ni-7Mn (wt. %) maraging alloy and subsequent aging treatment at 773 K were found to result in the formation of a nanostructured material. Hardness measurement and transmission electron microscopy were used to study the aging behavior and microstructural evolution of the nanostructured alloy. At early stages of aging, an ultrafine grained structure was observed showing fine matrix precipitates. However, at later stages of aging, severe coarsening of precipitates was found. Consequently, a lamellar duplex microstructure composed of conventional precipitation hardened laths and ultrafine grained ferrite was identified in an intermediate aging time. Coarse f.c.t. θ-NiMn precipitates were identified among ultrafine grained ferrite. At longer stages of aging, evolution of the coarsening reaction were found to result in the development of the ultrafine grained ferrite regions.

Keywords: Nanostructure: Cold Rolling: Maraging: Precipitation: Coarsening

Legal notice
  • Legal notice:

    Copyrighted materials, (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced, stored in or introduced into a retrieval or caching system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording or otherwise), or for any purpose, without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: http://science24.com/paper/3873 must be provided.

 

Related papers
  1. Statistics of misorientation across grain boundaries in nanostructured Fe-Ni-Mn steel prepared by cold rolling and annealing of lath martensite
  2. Determination of dislocation density and crystallite size distribution in deformed lath martensite by X-ray peak profile analysis
  3. High resolution transmission electron microscopy study on the nano-scale twining of θ-NiMn precipitates in Fe-Ni-Mn maraging alloy

Presentation: oral at E-MRS Fall Meeting 2005, Symposium I, by Mahmoud Nili Ahmadabadi
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-31 13:50
Revised:   2009-06-07 00:44
Google
 
Web science24.com
© 1998-2021 pielaszek research, all rights reserved Powered by the Conference Engine