The effect of heat treatment on microstructure and cryogenic fracture properties in 5Ni and 9Ni steel

Strife, J. R.; Passoja, D. E.

doi:10.1007/bf02653488

Cited by 68 publications

(34 citation statements)

References 5 publications

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“…Tempering for much longer than 10 hrs at 600 0 C, or tempering at higher temperatures, was found to be deleterious to both austenite stability and to cryogenic toughness. Similar systematics have been reported by others [11][12][13][14].…”

Section: In'illoducl'ionsupporting

confidence: 92%

“…However. the data of Strife and Passoja [14] suggest that only 5% austenite served to getter most of the carbon in 9Ni steel after tempering for 1 hr at 590°C, implying an austenite carbon concentration of greater than 1%.…”

Section: Carbon Concentrationsmentioning

confidence: 93%

“…Relationships between the stability of austenite and cryogenic fracture toughness have been an important, albeit a controversial topic of research [3][4][5][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23].…”

Section: In'illoducl'ionmentioning

confidence: 99%

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The stability of precipitated austenite and the toughness of 9Ni steel

Fultz

Kim

et al. 1985

Metall Trans A

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Section: In'illoducl'ionsupporting

confidence: 92%

Section: Carbon Concentrationsmentioning

confidence: 93%

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The stability of precipitated austenite and the toughness of 9Ni steel

Fultz

Kim

et al. 1985

Metall Trans A

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“…We conclude that the high-entropy CrMnFeCoNi alloy displays remarkable fracture toughness properties at tensile strengths of 730 to 1280 GPa, which exceed 200 MPa·m 1/2 at crack initiation and rise to >300 MPa·m 1/2 for stable crack growth at cryogenic temperatures down to 77 K. The alloy has toughness levels that are comparable to the very best cryogenic steels, specifically certain austenitic stainless steels (15,16) and high-Ni steels (17)(18)(19)(45)(46)(47)(48), which also have outstanding combinations of strength and ductility.…”

Section: Previous Self-assembly Experiments Performed In Nonpolarmentioning

confidence: 79%

A fracture-resistant high-entropy alloy for cryogenic applications

Gludovatz

Hohenwarter

Catoor

et al. 2014

Science

4,543

1,506

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High-entropy alloys are equiatomic, multi-element systems that can crystallize as a single phase, despite containing multiple elements with different crystal structures. A rationale for this is that the configurational entropy contribution to the total free energy in alloys with five or more major elements may stabilize the solid-solution state relative to multiphase microstructures. We examined a five-element high-entropy alloy, CrMnFeCoNi, which forms a single-phase face-centered cubic solid solution, and found it to have exceptional damage tolerance with tensile strengths above 1 GPa and fracture toughness values exceeding 200 MPa·m(1/2). Furthermore, its mechanical properties actually improve at cryogenic temperatures; we attribute this to a transition from planar-slip dislocation activity at room temperature to deformation by mechanical nanotwinning with decreasing temperature, which results in continuous steady strain hardening.

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“…As illustrated in Figure 1, with the addition of nickel as an austenite stabilizing element, the ferrite-austenite transformation occurs at appreciably low temperatures. The resultant microstructure possesses higher strength and superior notch/fracture toughness at cryogenic temperatures due to the presence of stable retained austenite (2,(7)(8)(9)(10). The resultant microstructure possesses higher strength and superior notch/fracture toughness at cryogenic temperatures due to the presence of stable retained austenite (2,(7)(8)(9)(10).…”

Section: Metallurgy Of 9%ni Steelmentioning

confidence: 99%