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/10054/9252

Title: Development of Ultrahigh Strength Low Alloy Steel through Electroslag Refining Process
Authors: MAITY, SK
BALLAL, NB
GOLDHAHN, G
KAWALLA, R
Keywords: heat-affected zones
fracture-toughness
inoculation
microstructure
precipitation
titanium
Issue Date: 2009
Publisher: IRON STEEL INST JAPAN KEIDANREN KAIKAN
Citation: ISIJ INTERNATIONAL, 49(6), 902-910
Abstract: In this investigation, attempts are made to develop special steel by electroslag refining (ESR) process. The base alloy is prepared with a chemical composition of 0.28% C, 1.0% Mn, 1.0% Mo, 0.35% V, 4.2% Cr with trace amount of S and P This alloy displays yield strength of about 1450 MPa in quenched-and-tempered condition. It is further attempted to increase the strength and toughness of the base alloy by addition of 1 to 3% of nickel. As a result there is a substantial improvement of mechanical properties. 3% nickel steel displays tensile strength of 1758 MPa and yield strength of 1 542 MPa. The austenite grains are marginally reduced in nickel alloys. With the chemical composition of nickel alloys when about 0.07% titanium is inoculated during ESR process, there is a deterioration of the tensile properties. In 3% nickel alloy the effect is more prominent, which displays yield strength of 1455 MPa along with the lowest value of elongation. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron probe microanalysis (EPMA) studies indicate that the microstructures of un-inoculated nickel steel predominantly consist of tempered lath martensites. In titanium inoculated alloys the microstructures are mixture of retain austenite, bainite and martensites. Strengths are deteriorated possibly due to the inhomogenous distribution of carbon because of the formation of different phases and depletion of nickel due to the precipitation of the corresponding intermetallics of (Ni, Ti).
URI: http://dspace.library.iitb.ac.in/xmlui/handle/10054/9252
http://hdl.handle.net/10054/9252
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