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Development of ultrahigh strength steel through electroslag remelting with inoculation

DSpace at IIT Bombay

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Title Development of ultrahigh strength steel through electroslag remelting with inoculation
 
Creator BANDYOPADHYAY, TR
RAO, PK
PRABHU, N
 
Subject 0.3c-crmov steel
esr
inoculation
mixed microstructure
ultrahigh strength
 
Description In an earlier work, an ultrahigh strength steel, designated as 0.3C-CrMoV ESR (0.3C-1.0Mo-0.3V), which is a modified version of AFNOR 15CDV6 steel, has been developed by increasing carbon content from 0.15 to 0.28% and by processing the steel through electroslag refining (ESR) with inoculation by either niobium or zirconium during ESR. Depending on the quench rate, the ultimate tensile strength (UTS), 0.2% proof stress (PS), percentage of elongation and Charpy U notch impact energy values of the steel in the as cast condition after heat treatment varied at ranges of 1550-1560 MPa, 1500-1520 MPa, 8-12.5% and 370-790 kJ m 22 respectively. The microstructure of the 0.3C-CrMoV steel is reported to consist of martensite and bainite. In the present investigation, the UTS and 0.2% PS have been further increasd to 1740-1760 and 1570 1610 MPa respectively by increasing the chromium content of the 0.3C-CrMoV steel to 4% and by subjecting the steel to ESR with inoculation by titanium. Interestingly, the percentage of elongation also increased to 14% simultaneously with UTS and PS without any drop in the Charpy U notch impact energy. The improvement in the mechanical properties of the steel with increasing chromium content may be attributed to an increase in the volume fraction of the martensite in the mixed martensite and bainite microstructure.
 
Publisher MANEY PUBLISHING
 
Date 2011-08-17T13:50:04Z
2011-12-26T12:55:34Z
2011-12-27T05:41:12Z
2011-08-17T13:50:04Z
2011-12-26T12:55:34Z
2011-12-27T05:41:12Z
2006
 
Type Article
 
Identifier IRONMAKING & STEELMAKING, 33(4), 337-343
0301-9233
http://dx.doi.org/10.1179/174328106X101574
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9886
http://hdl.handle.net/10054/9886
 
Language en