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Study of fracture properties of 0 center dot 3C-CrMoV(ESR) ultrahigh strength steel

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Title Study of fracture properties of 0 center dot 3C-CrMoV(ESR) ultrahigh strength steel
 
Creator SURESH, MR
KUMAR, RS
SREEKUMAR, K
SINHA, PP
BALLAL, NB
RAO, PK
 
Subject fracture toughness
residual strength
0 center dot 3c-crmov(esr) steel
esr
inoculation
ultrahigh strength
low alloy steel
compact tension specimen
surface cracked tension (sct) specimen
optical metallography
sem
tem
space launch vehicle
 
Description The fracture properties of a new ultrahigh strength low alloy steel 0.3C-CrMoV(ESR), developed primarily as a cost effective material for space launch vehicle applications, have been evaluated through two different methods. The steel was processed through electroslag remelting (ESR) with inoculation using niobium to produce 4 tonne ingots, which were forged and rolled into plates. The fracture toughness of this steel has been evaluated by testing compact tension specimens and surface cracked tension specimens following the procedures in ASTM E-399 and ASTM E-740 respectively. The steel, after quenching and tempering, has a 0.2% proof strength of 1470 MPa, ultimate tensile strength of 1725 MPa and fracture toughness of 96 MPa root m. It has high residual strength also in the presence of surface cracks of 5 x 2 mm size. The microstructure consists of fine grains in the annealed condition and lath martensite in the hardened condition. After tempering, fine carbide precipitates distributed along the lath boundaries and within the laths were observed.
 
Publisher MANEY PUBLISHING
 
Date 2011-08-18T06:43:33Z
2011-12-26T12:55:36Z
2011-12-27T05:41:31Z
2011-08-18T06:43:33Z
2011-12-26T12:55:36Z
2011-12-27T05:41:31Z
2005
 
Type Article
 
Identifier MATERIALS SCIENCE AND TECHNOLOGY, 21(3), 357-365
0267-0836
http://dx.doi.org/10.1179/174328405X27106
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9915
http://hdl.handle.net/10054/9915
 
Language en