Al-Li alloys and ultrahigh-strength steels for U.S. Navy aircraft

Lee, E. W.; Neu, C E; Kozol, Joseph

doi:10.1007/bf03220940

Cited by 16 publications

(4 citation statements)

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“…On the other hand, the Cr addition seems to be necessary in the high Co-Ni secondary hardening ultrahigh strength alloy steels with superior toughness, such as HY180, [16,17] AF1410, [18,19] and AerMet 100, [20,21] even though Cr could weaken the extent of secondary hardening. However, there are a few studies on the effect of Cr addition on hardening [22,23] and fracture behavior.…”

Section: Introductionmentioning

confidence: 98%

Secondary hardening and fracture behavior in alloy steels containing Mo, W, and Cr

Kwon

Lee

Lee³

et al. 1997

Metall Mater Trans A

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In 4Mo, 6W, 2Mo3W, 2Mo2Cr, and 3W2Cr alloy steels, which contain alloying elements, such as Mo, W and Cr, contributing to the secondary hardening by forming M 2 C-type carbide, the secondary hardening and fracture behavior were studied. Molybdenum had a strong effect on secondary hardening, while W had a very weak effect on it but delayed the overaging. The MoW steel exhibited both moderately strong hardening and considerable resistance to overaging. On the other hand, the secondary hardening effect was diminished by the Cr addition, because the cementite of M 3 C type was stabilized at higher temperatures and the formation of M 2 C carbides was thus inhibited. Although the Cr addition had no merit in the secondary hardening itself, it eliminated the secondary hardening embrittlement (SHE). This was observed as a severe intergranular embrittlement due to the impurity segregation for the Mo and MoW steels and as a decrease in upper shelf energy for W steel, even in the overaged condition.

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Section: Introductionmentioning

confidence: 98%

Secondary hardening and fracture behavior in alloy steels containing Mo, W, and Cr

Kwon

Lee

Lee³

et al. 1997

Metall Mater Trans A

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“…In the past decades, there have been extensive interests in the structure and mechanical properties of cobalt-nickel secondary hardening ultrahigh strength steels. The studies have resulted in the successful development of Hy180 [8], AF1410 [9], AerMet100 [10], and more recently AerMet310 [11]. AerMet310 is a companion to AerMet100 alloy.…”

Section: Introductionmentioning

confidence: 99%

Influence of Heat Treatment on Microstructure and Properties of Ultrahigh Strength Fe-Ni-Co Alloy

Zhong

2013

AMR

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The effect of temper temperature and duration on the microstructure and mechanical properties of new-type ultrahigh strength Fe-Ni-Co alloy was investigated with by mechanics performance testing and TEM. The results showed that the maximum ultimate tensile strength could reach 2230MPa after temper near 470°C due to the precipitation of coherent zones of fine carbides. With tempering time extended, the strength was cut down by the M2C carbides coarsening and the decreased coherency with matrix.

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“…High strength low alloy steel 30XGCN2A is being used for MiG series of Russian based aircraft. Due to its high YS to UTS ratio (Table 2) better fracture toughness & stress corrosion resistance, maraging steels have been selected for use on aircraft which are expected to operate near/over marine atmosphere [2,3] and the chemical composition of these steels is given in Table-3.…”

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confidence: 99%

Type Certification of 18 Ni Maraging Steels for Landing Gears

Kumar

Balaji

Prasad

2012

MSF

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Maraging steels exhibit unique properties, such as high strength with excellent fracture toughness, ease of machining and above all distortion free thermal processing. These attractive properties and advantages of maraging steel do not outweigh the initial cost resulting from high alloy content and especially in certain structural components where in much of the forging is machined as swarf. However, with the constant drive to prove the technology when maximum strength and stiffness per unit volume becomes the major criteria, the choice of material may overwhelmingly become maraging steel. Above requirements necessiate a landing gear material for Indian fighter aircraft to have a combination of high strength, sufficient stiffness, excellent fatigue strength, utmost cleanliness, resistance to micro-structural degradation, freedom from surface anomalies, good corrosion & stress corrosion resistance and superior toughness to meet the current damage tolerant design criteria. M/s Midhani in consultation with airworthiness authorities took up the task to develop & manufacture this steel to the laid down type test schedule. The steel has satisfactorily met all the requirements and landing gear has been successfully forged, machined and fitted to the prototype. This paper describes the metallurgical aspects that are relevant for developing the maraging steel along with a brief note on the properties - chemical, microstructural and mechanical. An attempt is made in the presentation to show that the indigenously developed and produced maraging steel is indeed at par with aeronautical grade materials, including maraging steels of international sources.

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Al-Li alloys and ultrahigh-strength steels for U.S. Navy aircraft

Cited by 16 publications

References 0 publications

Secondary hardening and fracture behavior in alloy steels containing Mo, W, and Cr

Secondary hardening and fracture behavior in alloy steels containing Mo, W, and Cr

Influence of Heat Treatment on Microstructure and Properties of Ultrahigh Strength Fe-Ni-Co Alloy

Type Certification of 18 Ni Maraging Steels for Landing Gears

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