Grain growth in 18Ni 1800 MPa maraging steel

Sinha, P. P.; Sreekumar, K.; Natarajan, Arivazhagan; Nagarajan, K. V.

doi:10.1007/bf02402961

Cited by 14 publications

(7 citation statements)

References 13 publications

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“…PAG size was found to increase monotonically with increase in SA temperature in both cobalt-bearing [60,61] and cobalt-free [51,61] grades. Different conclusions were reached for different grades and there is some lack of clarity.…”

Section: Effect Of Solution Annealing Temperature/pag Size On Martensmentioning

confidence: 99%

Progress in understanding the metallurgy of 18% nickel maraging steels

Rao

2006

International Journal of Materials Research

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Progress in understanding the metallurgy of 18 % nickel maraging steelsMaraging steels based on iron -nickel martensite constitute a very important family of high-strength steels, which distinguishes itself by demonstrating an unparalleled combination of excellent fabricability and high strength and fracture toughness after heat treatment. Heat treatment of these steels has now been perfected to ensure consistently high levels of strength, ductility, and toughness in a variety of product shapes and sizes. Cobalt-free variants have been commercialized as part of efforts to save production costs. Further knowledge has been generated on 18 % nickel maraging steels regarding phases precipitating during aging, thermal embrittlement, thermal cycling and austenite reversion/retention and their effect on mechanical properties. The paper reviews the progress made over the last one and half decades.

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Section: Effect Of Solution Annealing Temperature/pag Size On Martensmentioning

confidence: 99%

Progress in understanding the metallurgy of 18% nickel maraging steels

Rao

2006

International Journal of Materials Research

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“…The MgZn 2 -type Laves structure consists of 3 sublattices with coordination numbers (CN) of 12, 12, and III III II I I 16, respectively, containing 12 atoms per unit cell. The larger Mg atoms occupy the sublattices of CN16, and the smaller Zn atoms occupy the sublattices of CN12 [31]. Consistent with the general conclusion that the percentage of the larger atoms on an atomic site increases with increasing coordination from nearly zero for CN12 to 100% for CN16, we would expect the smaller Ni as major atom ®lling the two sublattices of CN12 with 2-and 6-fold lattice sites, and the larger Ti or Al atoms to ®ll the 4-fold lattice sites with CN16.…”

Section: T 3 Almentioning

confidence: 99%

The ternary system Al–Ni–Ti Part II: thermodynamic assessment and experimental investigation of polythermal phase equilibria

et al. 1999

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The Al±Ni±Ti phase diagram has been thermodynamically assessed and a consistent set of thermodynamic functions has been developed. The thermodynamic modeling is based on an experimental investigation of the phase equilibria in the composition range of 0.14x Al 40.7. Alloys were prepared by argon-arc or vacuum-electron beam melting of elemental powder blends. X-ray powder diraction, metallography, SEM and EMPA-techniques were employed to analyze the samples in the as-cast state as well as after annealing at 800, 900 and 1000 C. The existence of the four ternary compounds, ( 1 to ( 4 , has been con®rmed, although homogeneity regions dier signi®cantly from reports in the literature. The homogeneous phase, previously claimed at ``Al 23 Ni 26 Ti 51 '', is shown by high resolution microprobe and X-ray diraction measurements to be an extremely ®ne-grained eutectic structure. The congruent melting behavior of ( 4 elxi 2 i is con®rmed, but, in contrast to earlier reports, primary crystallization and congruent melting have been observed for ( 1 el 13 xi 2 i 5 and ( 3 el 3 xii 2 . In contrast to earlier assessments, ( 1 Y( 2 and ( 3 are experimentally found to be stable at 800, 900 and 1000 C. The thermodynamic modeling of the ternary phases ( 2 and ( 3 is done with sim-pli®ed sublattice models, considering their crystal structure and homogeneity ranges. The sublattice model for ( 4 is taken from an earlier asessment of the nickel-rich ternary phase equilibria. The present assessment covers the entire composition range. An application to the solidi®cation behavior of ternary alloys is also exempli®ed.

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“…Laves phases are topologically close-packed (TCP) phases formed at or near the AB, composition. The coordination number is 12 for the smaller B atoms and 16 for the larger A atoms [7,8]. Most Laves phases have either the cubic MgCu, (C15) or hexagonal MgZn, ') Cambridge, MA 02139, USA.…”

Section: Structures and Compositionmentioning

confidence: 99%

Laves-phase superalloys?

Livingston

1992

Phys. Stat. Sol. (a)

138

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The mechanical properties of Laves phases, and of alloys containing Laves phases, are reviewed with an eye to their potential as high‐temperature structural materials. Several two‐phase alloys show promising combinations of high‐temperature strength and low‐temperature toughness, and extensive room‐temperature deformability of the cubic Laves phase by mechanical twinning is demonstrated in one series of alloys.

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Grain growth in 18Ni 1800 MPa maraging steel

Cited by 14 publications

References 13 publications

Progress in understanding the metallurgy of 18% nickel maraging steels

Progress in understanding the metallurgy of 18% nickel maraging steels

The ternary system Al–Ni–Ti Part II: thermodynamic assessment and experimental investigation of polythermal phase equilibria

Laves-phase superalloys?

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