Improvement in Properties of Ni-Cr-Mo-V Steel through Process Control
Abstract:Although gun barrel steels are an important variety from defense view point, available literatures are very limited. In the present work, an IF grade Ni-Cr-Mo-V high strength low alloy steel is produced in Electric Earth Furnace-ESR Route. Ingot was hot forged to desired dimension with a reduction ratio of 70-75% followed by homogenization, hardening and tempering treatment. Sample chemistry, NMIR, macro and micro structural analyses were done. Mechanical properties which include tensile, impact, and fracture toughness were studied. Ultrasonic testing was done to identify internal flaws. The existing high strength low alloy Ni-Cr-Mo-V steel shows improved properties in modified processing route and heat treatment schedule in comparison to properties noted earlier for manufacturing of gun barrels. The improvement in properties seems to withstand higher explosive loads with the same amount of steel in gun barrel application.
 Nageswara Rao M: Metallurgy in India – A Retrospective, (ed.) Ramachandra Rao P and Goswami N G, India International Publisher, New Delhi (2001), 272
 Hazira J P and Ratnam U: Trans. Ind. Inst. Met., 31 (1978) 20
 Hebsur M G, Abraham K P and Prasad Y V R K: J. Mech. Working Technology, 4 (1981) 341
 Hebsur M G, Abraham K P and Prasad Y V R K: Proc. Intl. Conf.on Fracture Mechanics in Engineering Application, (eds) Sih G C and Valluri S R; Sijth off and Novrdhoff, Maryland, USA (1979)
 Hebsur M G, Abraham K P and Prasad Y V R K: Engg. Fracture Mechanics, 13 (1980) 851
 Bonder R L and Capellini R F: Optimization of Processing, Properties and Service performance through Microstructural control, (eds) Bramfitt B L, Benn R C, Brinkman C R and Vander Voort G F, ASTM STP 979, ASTM, Philadelphia (1988) 47
 Ahlblom B and Sandstrom R: Intl. Metals Reviews No.1 (1982) 1
 Towle D J and Gladman T: Met. Science- “Deformation Behaviors of Metals and Alloys at Elevated Temperature”, 13 (1981) 246.
 Krauss G: Steels - Heat Treatment and Processing Principles, ASM International, Materials Park, Ohio (1990) 148.
 Grange R A: Trans ASM, vol. 59, no.5 (1966) pp.26-48.
 Swarr T E and Krauss G: Met Trans A, “The Effect of Structure on the deformation of as-quenched and tempered Martensite in an Fe-0.2 pct Alloy”, 7A (1976) 41.
 Materkowski J P and Krauss G: Met Trans A, “Tempered Martensite Embrittlement in SAE 4340 Steel”, 10A (1979) 1643.
 Thomas G: Met Trans A, “Thermal cycling treatments and microstructures for improved properties of Fe-0.12% C-0.5% Mn Steels”, 9A (1978) 439.
 Eliaz N, Shachar A, Tal and Eliezer D: Eng. Failure Anal., 9 (2002) 167
 AMPTIAC Quarterly Publication on Army Materials Research, Volume-8, 4th Nov’2004, PP.49-56.
 T.J. Rodman, Reports of Experiments on the Strength and Other Properties of Metals for Cannon, with a Description of the Machines for Testing Metals, and of the Classification of the Cannon in Service, US Ordnance Department,1861.
 US Naval Institute- paper on “Naval Ordnance and Gunnery Gun Barrel Construction” Gene Slover-1939.
 International Journal of Mechanical & Mechatronics Engineering IJMME-IJENS Vol: 11 No: 06 titled “Life Cycle and Performances Progressing of Artillery Barrels” Dr. Eng. Mohammed J. Barzanjy, Mechanical Dept., College of Engineering, ERBIL, IRAQ- PP-19-21.
 Technical report on “The Autofrettage Principle as Applied to High Strength Light Weight Gun Tubes” T. E. Davidson, C. S. Barton, A. N. Reiner, D. P. Kendall in October 1959.
 Defense Technical Information Center Compilation Part Notice (ADP012479) Paper published on “Large Caliber Gun Tube Materials Systems Design”, a part of the report on “10th U.S. Army Gun Dynamics Symposium Proceedings”.
 “Americanization and its Limits: Theory and Practice in the Reconstruction of Britain's Engineering Industries, 1945-55” Jonathan Zeitlin, University of Wisconsin-Madison.
 “R&D on Production & Supply-Chain for exellence of operation and Optimization of wide product varieties and diversification of customer needs” JMA Consultancy.