Timetal® 575: A Novel High Strength Forgeable α/β Titanium Alloy

Thomas, Matthew; Hewitt, Jon; Bache, M.R.; Thomas, Rebecca; Garratt, P.G.; Kosaka, Yoji

doi:10.1002/9781119296126.ch257

Cited by 8 publications

(8 citation statements)

References 3 publications

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“…Resulting from these changes, the alloy demonstrates 20% higher strength than typical Ti-17 strength at 426 °C, 20% higher HCF runout strength at room temperature, and double the creep life to 0.2% elongation at 426 °C. [38] Titanium Metals Corporation (TIMET) also has several new alloys and processes under development [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57]. The TIMETAL alloy Ti18 is a new high strength near-β alloy for forged products and fastener stock [39][40][41][42].…”

Section: New Alloy Developmentsmentioning

confidence: 99%

“…Titanium Metals Corporation (TIMET) also has several new alloys and processes under development [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57]. The TIMETAL alloy Ti18 is a new high strength near-β alloy for forged products and fastener stock [39][40][41][42].…”

Section: New Alloy Developmentsmentioning

confidence: 99%

“…TIMETAL ® 407 (Ti 407) nominal composition Ti-0.85Al-3.9V-0.25Fe-0.25Si, [49,50] is a α + β alloy that exhibits high ductility and excellent energy absorption as well as improved manufacturability compared to Ti-6-4 [48][49][50][51][52]. Production scale billet, bar, wire, and coil sheet have been produced showing moderate strength levels and higher ductility compared to Ti-6-4 [50].…”

Section: New Alloy Developmentsmentioning

confidence: 99%

“…Production scale billet, bar, wire, and coil sheet have been produced showing moderate strength levels and higher ductility compared to Ti-6-4 [50]. Despite the relatively low UTS compared to Ti-6-4, Ti-407 has been shown to have excellent HCF fatigue strength [53]. An additional benefit of Ti-407 is lower forming temperatures and decreased tool wear life compared to Ti-6-4 [1,2].…”

Section: New Alloy Developmentsmentioning

confidence: 99%

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Opportunities and Issues in the Application of Titanium Alloys for Aerospace Components

Williams

Boyer

2020

Metals

322

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The metal titanium (Ti) and its alloys have many attributes which are attractive as structural materials, but they also have one major disadvantage, high initial cost. Nevertheless, Ti and Ti alloys are used extensively in airframes, gas turbine engines (GTE), and rocket engines (RE). The high cost is a deterrent, particularly in airframe applications, in that the other alloys it competes with are, for the most part, significantly lower cost. This is less of a concern for GTE and RE where the cost of titanium is closer to and sometimes even lower than some of the materials it competes with for these applications. In spacecraft the weight savings are so important that cost is a lesser concern. Ti and its alloys consist of five families of alloys; α-Ti, near α-alloys, α + β alloys, β-alloys, and Ti-based intermetallic compounds. The intermetallic compounds of primary interest today are those based on the compound TiAl which, at this time, are only used for engine applications because of their higher temperature capability. These TiAl-based compounds are used in a relatively low, but growing, amounts. The first production application was for low pressure turbine blades in the GE engine (GEnx) used on the Boeing 787, followed by the GE LEAP engine used on A-320neo and B-737MAX. These air foils are investment cast and machined. The next application is for the GE90X which will power the Boeing B-777X. These air foils will be made by additive manufacturing (AM). Unalloyed titanium and titanium alloys are typically melted by vacuum arc melting and re-melted either once (2X VAR) or twice (3X VAR); however a new and very different melting method (cold hearth melting) has recently become favored, mainly for high performance applications such as rotors in aircraft engines. This process resulted in higher quality ingots with a significant reduction in melt-related defects. Once melted and cast into ingots, the alloys can be processed using all the standard thermomechanical working and casting processes used for making components of other types of structural alloys. Because of their limited ductility, the TiAl-based intermetallic compounds are quite difficult to process using ordinary wrought methods. Consequently, the low-pressure turbine blades currently in service are investment cast and machined to net shape. The AM air foils will require minimal machining, which is an advantage. This paper describes some relatively recent developments as well as some issues and opportunities associated with the production and use of Ti and its alloys in aerospace components. Included are new Ti alloys, new applications of Ti alloys, and the current status of several manufacturing processes including a discussion of the promise and current reality of additive manufacturing as a potentially revolutionary method of producing Ti alloy components.

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Section: New Alloy Developmentsmentioning

confidence: 99%

Section: New Alloy Developmentsmentioning

confidence: 99%

Section: New Alloy Developmentsmentioning

confidence: 99%

Section: New Alloy Developmentsmentioning

confidence: 99%

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Opportunities and Issues in the Application of Titanium Alloys for Aerospace Components

Williams

Boyer

2020

Metals

322

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“…All tests were carried out in accordance with BS EN 6072:2010 at a fixed peak stress of 700MPa. [2] To establish when key microstructure features begin to form, 11 samples sectioned into 20x20x40mm test pieces were heated in the beta phase (1065°C) for 1 hour then air cooled to the temperatures listed in Table 3. Once the temperature in Table 3 was met, the samples were water quenched to "freeze in" the microstructural features at that temperature.…”

mentioning

confidence: 99%

Effect of microstructure and cooling rate on the fatigue performance of TIMETAL^® 575

2020

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A key design consideration for material selection in the aerospace industry is weight reduction; with excellent strength to weight ratio, high temperature resistance, and fatigue performance, titanium alloys are extensively used. New titanium alloys continue to enhance performance and broaden the range of applications. Titanium Metals Corporation (TIMET) recently developed TIMETAL® 575 (Ti575), a high strength titanium alloy with superior fatigue performance over Ti-6Al-4V, aimed at aerospace applications where these properties are imperative i.e. aerospace turbine discs and blades. [1] [2] This work intends to advance the understanding of the effect of thermal processing of Ti575, by investigating the effect of primary alpha (αp) volume fraction and cooling rate on tensile and fatigue performance in post forged heat-treated microstructures. Microstructural assessment and mechanical performance were completed and are discussed. Three cooling methods from three solution heat-treat temperatures were investigated in this work. The results from these experiments were compared using optical microscopy, electron backscatter diffraction (EBSD), room temperature tensile and high cycle fatigue (HCF) tests.

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Crack initiation mechanism in a high-strength Ti-5Al-7.5V alloy subjected to high cycle fatigue loading

Kou

Chen

et al. 2023

Engineering Failure Analysis

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Timetal® 575: A Novel High Strength Forgeable α/β Titanium Alloy

Cited by 8 publications

References 3 publications

Opportunities and Issues in the Application of Titanium Alloys for Aerospace Components

Opportunities and Issues in the Application of Titanium Alloys for Aerospace Components

Effect of microstructure and cooling rate on the fatigue performance of TIMETAL^® 575

Crack initiation mechanism in a high-strength Ti-5Al-7.5V alloy subjected to high cycle fatigue loading

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Timetal® 575: A Novel High Strength Forgeable α/β Titanium Alloy

Cited by 8 publications

References 3 publications

Opportunities and Issues in the Application of Titanium Alloys for Aerospace Components

Opportunities and Issues in the Application of Titanium Alloys for Aerospace Components

Effect of microstructure and cooling rate on the fatigue performance of TIMETAL® 575

Crack initiation mechanism in a high-strength Ti-5Al-7.5V alloy subjected to high cycle fatigue loading

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Product

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Effect of microstructure and cooling rate on the fatigue performance of TIMETAL^® 575