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THE MORPHOLOGY AND AGING BEHAVIOR OF DELTA-FERRITE IN A MODIFIED 9CR-1MO STEEL

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Title THE MORPHOLOGY AND AGING BEHAVIOR OF DELTA-FERRITE IN A MODIFIED 9CR-1MO STEEL
 
Creator KISHORE, R
SINGH, RN
SINHA, TK
KASHYAP, BP
 
Description Dual phase (martensite + delta-ferrite) microstructures were developed in a modified 9Cr-1Mo steel, by austenitising at 1523-1623 K, followed by water-quenching. These duplex structures were thermally aged at 973 K for ageing periods varying from 30 min to 21 h. Morphological aspects of delta-ferrite phase and its response to age-hardening were studied by optical, scanning electron and transmission electron microscopy, X-ray diffraction, electron probe microanalysis and microhardness testing. It was observed that austenitizing at 1523 K produced fine, acicular delta-ferrite while the delta-ferrite formed by austenitising at higher temperatures (1573-623 K) were massive, irregular-shaped and banded. Moreover the presence of delta-ferrite caused an abnormally strong (110) reflection, observed in X-ray diffraction patterns of martensite plus delta-ferrite structures. This behaviour is thought to be due to development of (110) texture in delta-ferrite phase. Thermal ageing at 973 K caused age-hardening of delta-ferrite with a peak hardness attained after 3.6 ks of ageing. Electron microscopic results suggest that the observed hardening was caused by the formation of Fe2Mo Laves phase.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-07-27T02:06:49Z
2011-12-26T12:53:06Z
2011-12-27T05:40:15Z
2011-07-27T02:06:49Z
2011-12-26T12:53:06Z
2011-12-27T05:40:15Z
1992
 
Type Article
 
Identifier JOURNAL OF NUCLEAR MATERIALS, 195(1-2), 198-204
0022-3115
http://dx.doi.org/10.1016/0022-3115(92)90377-W
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7081
http://hdl.handle.net/10054/7081
 
Language en