Effect of inoculation during electroslag refining on grain size of 15CDV6 and modified 15CDV6 steels

Bandyopadhyay, T. R.; Rao, P. Krishna; Prabhu, N.

doi:10.1179/174328106x101583

Cited by 8 publications

(3 citation statements)

References 4 publications

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“…While Erdmann et al added inoculant continuously and directly into the slag bath, Chatterjee coated the electrode with the powder of ferroalloy using sodium silicate as the binder. In the present investigation a new technique of inoculation in situ ESR has been adopted by attaching to the electrode a thin-walled tube of appropriate diameter filled with requisite ferrotitanium powder [8].…”

Section: Isrn Materials Sciencementioning

confidence: 99%

Improvement in Mechanical Properties of Standard 15CDV6 Steel by Increasing Carbon and Chromium Content and Inoculation with Titanium during ESR

Bandyopadhyay

Rao

Prabhu

2012

ISRN Materials Science

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The AFNOR 15CDV6 steel is high-strength steel with relatively low-level alloy content. In an earlier work, by processing the steel through ESR with inoculation, a marginal increase in strength and further increase in ductility and notch toughness were obtained. But the strength of the steel is inadequate for its use in fabrication of rocket motor casing in the Indian space programme. The present work aimed to increase the strength of the steel by increasing both carbon and chromium content of the AFNOR 15CDV6 steel at the expense of increased ductility and toughness due to processing through ESR. The increase in chromium content is expected to retard the bainite reaction resulting in an increased volume fraction of martensite in the mixed microstructure. Further, addition of chromium also causes secondary hardening during tempering. Another major objective was to study the effect of inoculation during ESR on grain size and mechanical properties. Titanium was used as inoculant in the present work.

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Section: Isrn Materials Sciencementioning

confidence: 99%

Improvement in Mechanical Properties of Standard 15CDV6 Steel by Increasing Carbon and Chromium Content and Inoculation with Titanium during ESR

Bandyopadhyay

Rao

Prabhu

2012

ISRN Materials Science

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“…Conventionally, processed (i.e., without electro‐slag refined (ESR)) mostly bainitic AFNOR 15CDV6 (with 0.15 wt% carbon and about 3.5 wt% of other alloying elements) has yield strength of about 800 MPa. Earlier attempts were made to increase the ductility and toughness through electro‐slag refining (ESR) route for its use in larger rockets . However, further improvement of the yield strength (1200–1300 MPa) along with ductility and notch toughness was attempted with inoculating the steel with 0.20% niobium during ESR processing, which resulted in typical lath martensitic structure on quenching .…”

Section: Introductionmentioning

confidence: 99%

Corrosion and nanomechanical behavior of high strength low alloy steels

Ghosh

Venugopal

Karthikeyan

et al. 2017

Materials & Corrosion

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The effect of electro‐slag refining (ESR) processing with niobium inoculation and increased carbon content of high strength low alloy steel was examined using electrochemical corrosion and nanomechanical test methods. The results indicate that ESR processing with niobium inoculation effectively improves the corrosion resistance of the steel by lowering the corrosion rate. This was shown due to refinement in grain size along with freedom from inclusions. Post test observation after potentiodynamic test revealed pitting corrosion attack of the steel processed through conventional melting process and its absence in case of ESR (with niobium inoculation) processed steel. Higher carbon content of 0.29 wt% effectively enhances the strength and hardness of the modified steel for use in larger rocket boosters. The lower Lc2 and lower friction coefficient (SFC) values obtained for the ESR processed (with niobium inoculation) steel during scratch test demonstrated that the hardness and wear resistance is better when compared to the conventional steel.

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“…8,9 The process of inoculation during ESR and the effect of inoculation on the grain size of modified 15CDV6 steels have been described in a separate paper. 10…”

Section: Introductionmentioning

confidence: 99%

Development of ultrahigh strength steel through electroslag remelting with inoculation

Bandyopadhyay¹,

Rao²,

Prabhu³

2006

Ironmaking & Steelmaking

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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.

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Effect of inoculation during electroslag refining on grain size of 15CDV6 and modified 15CDV6 steels

Cited by 8 publications

References 4 publications

Improvement in Mechanical Properties of Standard 15CDV6 Steel by Increasing Carbon and Chromium Content and Inoculation with Titanium during ESR

Improvement in Mechanical Properties of Standard 15CDV6 Steel by Increasing Carbon and Chromium Content and Inoculation with Titanium during ESR

Corrosion and nanomechanical behavior of high strength low alloy steels

Development of ultrahigh strength steel through electroslag remelting with inoculation

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