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Microstructural evolution during solidification of austenitic stainless steel weld metals: A color metallographic and electron microprobe analysis study

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Title Microstructural evolution during solidification of austenitic stainless steel weld metals: A color metallographic and electron microprobe analysis study
 
Creator RAJASEKHAR, K
HARENDRANATH, CS
RAMAN, R
KULKARNI, SD
 
Subject cracking
 
Description Structural evolution during solidification of austenitic stainless steel welds plays a crucial role in solidification cracking and microsegregation. Currently, there is no unambiguous method available to study the solidification mechanism in detail. The present investigation was undertaken to explore the potential of color metallography for revealing solidification structures. Weld composition was altered by adding varying amounts of nitrogen such that its location with respect to the phase diagram is moved in a specified direction. The controlled variations in the solidification mechanism thus brought about were studied metallographically, using Beraha's etchant and electron microprobe analysis. Metallographic studies complemented by electron probe microanalysis demonstrated color metallography to be a highly useful, simple, and reliable technique for revealing solidification structures. Color etching enables the quantitative estimation of high-temperature phases in the ferritic-austenitic mode of solidification. It also reveals the three-phase reaction mechanism in the (L + delta + gamma) region in detail. Ln fully austenitic structures, color etching reveals the growth patterns of cell structures and the effective interface area where impurities are expected to segregate. (C) Elsevier Science Inc., 1997.
 
Publisher ELSEVIER SCIENCE INC
 
Date 2011-07-27T10:24:09Z
2011-12-26T12:56:45Z
2011-12-27T05:45:57Z
2011-07-27T10:24:09Z
2011-12-26T12:56:45Z
2011-12-27T05:45:57Z
1997
 
Type Article
 
Identifier MATERIALS CHARACTERIZATION, 38(2), 53-65
1044-5803
http://dx.doi.org/10.1016/S1044-5803(97)80024-1
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7197
http://hdl.handle.net/10054/7197
 
Language en