Basic studies leading to the development of an ultrahigh strength,high fracture toughness low-alloy steel |
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Authors: | G Malakondaiah M Srinivas P Rama Rao |
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Affiliation: | (1) Defence Metallurgical Research Laboratory, Kanchanbagh P O, 500 258 Hyderabad, India;(2) Jawaharlal Nehru Centre for Advanced Scientific Research, IISc Campus, 560 012 Bangalore, India |
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Abstract: | Ultrahigh strength steels have been used increasingly in recent years for critical aircraft and aerospace structural applications.
In such applications, though materials performance is of prime consideration, cost and availability makes the low-alloy steels
an attractive option. This paper describes the development of an ultrahigh strength NiSiCrCoMo low-alloy steel, supported
by significant findings obtained from the basic studies that were aimed at understanding how solute additions influence fracture
resistance of iron, with and without the presence of carbon. The results of the basic studies, in combination with the work
of Garrison (1986) on a NiSiCr steel, have profitably been employed in the development of a NiSiCrCoMo low-alloy steel possessing
a strength-toughness combination quite comparable to the highly alloyed 250-grade maraging steel. Reproducibility of attractive
strength and toughness properties has been established in tonnage scale melts. This steel, in the softened condition, has
good formability and machinability. Weld parameters have also been established. The NiSiCrCoMo low-alloy steel thus meets
the requirements of performance and cost rendering it an attractive option for advanced structural applications. |
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Keywords: | Ultrahigh strength low-alloy steel fracture toughness alloy softening tempered martensite embrittlement |
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