Minigrain Processing of Nickel-Base Alloys

Brown, E. Ernest S.; Bottner, R.C.; Ruckle, D. L.

doi:10.7449/1972/superalloys_1972_l-1_l-12

Cited by 17 publications

(9 citation statements)

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“…Compared to conventional solubilization and direct aging processing for transformation and precipitation of phases, it may provide a significant improvement in the strength properties and low cycle fatigue, by controlling the grain size during forging .The DP718 was derived from a process known as "Minigrain" used mainly in the conversion process ingot-billet-bar [4].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Delta Phase in the Microstructure of the Inconel 718 subjected to “Delta-processing” Heat Treatment and Hot Deformed

Kañetas

Osorio

Guerrero‐Mata

et al. 2015

Procedia Materials Science

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Section: Introductionmentioning

confidence: 99%

Influence of the Delta Phase in the Microstructure of the Inconel 718 subjected to “Delta-processing” Heat Treatment and Hot Deformed

Kañetas

Osorio

Guerrero‐Mata

et al. 2015

Procedia Materials Science

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“…Radavich et al 23 demonstrated that the δ phase (Ni 3 Cb) inhibited grain growth in recrystallized alloy 718. This observation was developed into the Minigrain process [24][25][26] where grain sizes of ASTM 12 could be obtained. The primary strengthening phase for alloy 718 is γ ″ with some contribution from γ′.…”

Section: Grain-structure Evolutionmentioning

confidence: 99%

The structural evolution of superalloy ingots during hot working

Jones¹,

Jackman²

1999

JOM

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Editor's Note: A hypertext-enhanced version of this paper can be found on JOM's web site at www.tms.org/pubs/ journals/JOM/9901/ForbesJones-9901.html.This article provides an overview of structural changes that occur during the hot working of superalloys and provides insight into the use of precipitated particles and other thermomechanical factors to achieve desired structures. Examples will focus primarily on alloys 718 and 720, which are iron-nickel and nickel-based alloys, respectively. The availability of a second phase to control grain size is a characteristic of some iron-nickeland nickel-based superalloys that is not usually available to cobalt-based superalloys; processing with and without the use of a precipitated phase that influences microstructures will be illustrated by the use of these examples. ABOUT THE AUTHORSRobin M. Forbes Jones earned his Ph.D. in metallurgy at Imperial College of Science and Technology, London University, in 1967. He is currently manager of long-range product/ process R&D for Allvac.Laurence A. Jackman earned his Ph.D. in metallurgy at Rensselaer Polytechnic Institute in 1967. He is currently chief materials scientist at Allvac. Dr. Jackman is also a member of TMS.For more information, contact R.M. Forbes Jones,

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“…The Delta Process was derived from the original "Mini-grain" process developed by Brown, et al (2). The process exploited the unique dual phase metallurgy of IN718 to facilitate recrystallization while controlling the grain growth.…”

Section: Description Of the Delta Processmentioning

confidence: 99%

Evaluation of the Microstructure and Mechanical Properties of Delta Processed Alloy 718

Ruiz¹,

Obabueki²,

Gillespie³

1992

Superalloys 1992 (Seventh International Symposium)

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The mechanical behavior of lnconel 718 processed using the Delta Process (DP) conversion technique was studied. The DP conversion sequence uses a intentional delta phase precipitation cycle and subsequent thermomechanical processing to produce uniform fine grain billet and bar stock. The process was developed to improve the mechanical properties through the elimination of occasional coarse grains which are common in conventionally processed materials. The net effect resulted in a decreased standard deviation in the mechanical properties and an increase in the minimum properties. The microstructure, tensile, low cycle fatigue, and cyclic crack growth behaviors of DP718 impeller, disk forgings and bar stock were investigated. Forged DP718 properties were compared to conventionally processed lnconel 718 and another high strength material. The DP718 bar stock properties were compared to conventionally processed lnconel 718.

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Minigrain Processing of Nickel-Base Alloys

Cited by 17 publications

References 0 publications

Influence of the Delta Phase in the Microstructure of the Inconel 718 subjected to “Delta-processing” Heat Treatment and Hot Deformed

Influence of the Delta Phase in the Microstructure of the Inconel 718 subjected to “Delta-processing” Heat Treatment and Hot Deformed

The structural evolution of superalloy ingots during hot working

Evaluation of the Microstructure and Mechanical Properties of Delta Processed Alloy 718

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