DSpace
 

DSpace at IIT Bombay >
IITB Publications >
Article >

Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/9253

Title: Development of ultrahigh strength steel by electroslag refining: Effect of inoculation of titanium on the microstructures and mechanical properties
Authors: MAITY, SK
BALLAL, NB
KAWALLA, R
Issue Date: 2006
Publisher: IRON STEEL INST JAPAN KEIDANREN KAIKAN
Citation: ISIJ INTERNATIONAL, 46(9), 1361-1370
Abstract: saA low alloy steel with the nominal chemical composition of C 0.3%, Mn 1%, Cr 4%, Mo 1%, V 0.4% with lower amount of P and S is prepared by electroslag refining (ESR). The result of the mechanical properties of this steel after tempering confirms that this steel may be placed in the family of ultrahigh strength steel. The tensile, yield and impact strength of this steel are 1 650 MPa, 1450 MPa and 300 kJ/m(2) respectively, coupled with good ductility and hardness. Three more steels are prepared by inoculation of titanium during the ESR process similar to above composition. The analysis values of titanium in these steels are 0.07%, 0.20% and 0.4%. The addition of titanium resulted a sharp change in both microstructures and mechanical properties. It is noticed that 0.07% titanium results a sharp increase of tensile properties compared to un-inoculated steel. The tensile and yield strength of the 0.07% titanium steel are 17:30 MPa and 1512 MPa, respectively. Further increase of titanium to 0.2% and 0.4% result a significant drop of mechanical properties compared to steel with no titanium. The optical, SEM, TEM and TEM-carbon replica studies confirms that at lower concentration of titanium (0.07%), finer T(C, N) particles are precipitated which are able to restrict the austenite grain sizes. The refinement of austenite grains and consequent finer lath martensite may be the possible reason for strenghthening. Higher titanium (>= 0.2%) led to larger carbonitride particles which has no role on grain refinement.
URI: http://dx.doi.org/10.2355/isijinternational.46.1361
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9253
http://hdl.handle.net/10054/9253
ISSN: 0915-1559
Appears in Collections:Article

Files in This Item:

There are no files associated with this item.

View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback