Time-Temperature-Transformation Diagram of Alloy 945

Mannan, S.L.

doi:10.7449/2010/superalloys_2010_629_643

Cited by 8 publications

(7 citation statements)

References 5 publications

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“…The XRD pattern of the as received condition, as well as all the other conditions do only indicate the presence of the y' phase, comprising [Ni3(Al, Ti)], as reported by S. Mannan [3]. This author also reports the presence of y", carbides, n, and o phases.…”

Section: Solution Heat Treatment Temperatures (°C)supporting

confidence: 65%

“…This author also reports the presence of y", carbides, n, and o phases. However, the temperature range in which the experiments were conducted in the present investigation do according to an isothermal transformation diagram (TTT diagram) [3] only suggest the formation of the y' phase.…”

Section: Solution Heat Treatment Temperatures (°C)mentioning

confidence: 79%

“…The alloy is able to sustain the corrosive environments which are often faced in the O&G, which generally contains high levels of chlorides, S, H 2S, and CO2 at high temperatures and low pH conditions. The contents o f Nb, Al, and Ti leads to precipitation of the intermetallic y'' [Ni3(Nb,Al,Ti)] and y'[Ni3(Al,Ti)] phases which are responsible for the mechanical strength of the alloy [3].…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Solution Heat Treatment Temperature on the Hardness Response in Incoloy 945

Martins¹,

Andrade²,

Monteiro³

2014

8th International Symposium on Superalloy 718 and Derivatives (2014)

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The aim o f this work is to present the influence of solution heat treatment temperatures study and the corresponding variation on mechanical properties of Incoloy® 945 (Ni-Fe-Cr based alloy). The current literature on Incoloy® 945, designed by Special Metals Corporation, disclose that the solution heat treatment temperature is set to the range of 1010 °C to 1066 °C, where excessive grain growth might occur, which consequently, degrades its mechanical properties. The XRD pattern of the samples heat treated at different solution heat treatments in the present study indicate the presence of the y' phase, comprising N i3(Al, Ti). A large decrease in hardness with a small amount of grain growth (ASTM grain size 7) occurs at a temperature of 1020 °C primarily due to dissolution of the y' hardening phase as well as deleterious phases such as the carbides which are not present in a great amount.

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Section: Solution Heat Treatment Temperatures (°C)supporting

confidence: 65%

Section: Solution Heat Treatment Temperatures (°C)mentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Influence of Solution Heat Treatment Temperature on the Hardness Response in Incoloy 945

Martins¹,

Andrade²,

Monteiro³

2014

8th International Symposium on Superalloy 718 and Derivatives (2014)

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“…The key to success of these alloys is their resistance to formation of intergranular precipitates, in particular δ-phase [26]. The microstructure of annealed and aged 14 in.…”

Section: Beyond 718mentioning

confidence: 99%

Alloy 718 for Oilfield Applications

Mannan¹,

deBarbadillo²

2010

7th International Symposium on Superalloy 718 and Derivatives (2010)

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Alloy 718 (UNS N07718) was developed for use in the aircraft gas turbine engine, but its unique combination of room temperature strength and aqueous corrosion resistance make it a candidate for oilfield fasteners, valves, drill tools and completion equipment. Its popularity stemmed in part from its availability in a wide range of bar sizes from distributors. As oil and gas well environments became more severe, stress corrosion and hydrogen embrittlement failures in production equipment were experienced. This drove the evolution of the chemistry and microstructure that distinguishes today's oilfield grade 718 from aerospace grades. This paper reviews the development of the grade and its applications and describes some of its unique characteristics, testing and manufacturing methods. Consumption of 718 in the oilfield has probably reached its peak. Offshore production from deep sour fields created a demand for stronger, more corrosion resistant alloys has led to the development of new alloys that have begun to erode 718's market share. The last section of the paper describes these new alloys.

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“…Based on the chemical composition, the approximate MS of steel can be computed by Eq. (1) [11]. We note that this equation does not include the effect of cooling rate and the inhomogeneous distribution of the elements.…”

Section: Martensite Formationmentioning

confidence: 99%

Prediction of solidification phases in Cr-Ni stainless steel alloys manufactured by laser based powder bed fusion process

Jacob¹

2018

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The microstructure and strength of chromium-nickel (Cr-Ni) stainless steel alloy parts is highly dependent on the chemical composition of the material and the thermal cycling it experiences during each processing step. This is particularly true when utilizing a laser powder bed fusion (LPBF) process to create the part. LPBF is an additive manufacturing (AM) process that quickly scans a laser over thin layers of powder to melt and solidify the powder to create the part. This results in rapid heating and cooling of the material that is dependent on the processing conditions and part geometry. Consequently, it is necessary to understand how these heating and cooling rates affect the resulting material phases of the final part. Only then the manufacturer can have confidence that the part will perform as intended. The objective of the report is to provide LPBF users with the necessary background to develop processing conditions that will achieve their microstructural design objectives.This report outlines the established methods, using chemical-composition-based phase diagrams (Schäffler and DeLong diagrams), to predict the material microstructure of stainless steel weld metals and applies those methods to LPBF manufactured Cr-Ni stainless steel (S17-4 1 ). Predictions of the solidification phases in Cr-Ni stainless steel alloys, based on the ratio of the Cr and Ni equivalent, are shown. Incorporating these ratios into the phase solidification diagram helps to predict whether the solidification of a Cr-Ni stainless steel occurs in primary ferritic or austenitic phase. This approach also helps users to understand how the increased nitrogen content in additively manufactured S17-4 results in the greater retention of austenite compared to the same material produced by traditional methods. These diagrams can also inform the users about the stability of the retained austenite and its likelihood to decompose into other phases, such as martensite and cementite. In addition to outlining how phase solidification diagrams can help AM users better understand the material they produce, this report also compares results from literature describing microstructure of LPBF fabricated S17-4 with the predicted microstructure before and after different heat treatments. The report also shows that the fine columnar austenitic-martensitic-ferritic microstructure of as-manufactured S17-4 has changed into a predominant martensitic microstructure by a cryogenic treatment, resulting in an increase of hardness.Furthermore, results of mechanical property measurements on additively manufactured S17-4 from other research work are compared and discussed in the result section to explain possibilities of the material phase transformations during different heat treatments, which lead to changes in the mechanical material properties.

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Time-Temperature-Transformation Diagram of Alloy 945

Cited by 8 publications

References 5 publications

The Influence of Solution Heat Treatment Temperature on the Hardness Response in Incoloy 945

The Influence of Solution Heat Treatment Temperature on the Hardness Response in Incoloy 945

Alloy 718 for Oilfield Applications

Prediction of solidification phases in Cr-Ni stainless steel alloys manufactured by laser based powder bed fusion process

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