Burn-resistant behavior and mechanism of Ti14 alloy

Chen, Yongnan; Huo, Yazhou; Song, Xiaoguo; Bi, Zhongnan; Gao, Yang; Zhao, Yongqing

doi:10.1007/s12613-016-1229-9

Cited by 21 publications

(18 citation statements)

References 8 publications

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“…Similar with the results from that of Ti-V-Cr alloy [35,40] and TC4 alloy [49], it is identified an obvious burned product zone (BPZ), fusion zone (FZ), and heat affected zone (HAZ) for all examined samples (Figure 7a–c). Due to its easy fusion during burning, the burned product zone and fusion zone cannot be distinguished clearly from each other [25].…”

Section: Resultssupporting

confidence: 87%

Tailorable Burning Behavior of Ti14 Alloy by Controlling Semi-Solid Forging Temperature

et al. 2016

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Semi-solid processing (SSP) is a popular near-net-shape forming technology for metals, while its application is still limited in titanium alloy mainly due to its low formability. Recent works showed that SSP could effectively enhance the formability and mechanical properties of titanium alloys. The processing parameters such as temperature and forging rate/ratio, are directly correlated with the microstructure, which endow the alloy with different chemical and physical properties. Specifically, as a key structural material for the advanced aero-engine, the burn resistant performance is a crucial requirement for the burn resistant titanium alloy. Thus, this work aims to assess the burning behavior of Ti14, a kind of burn resistant alloy, as forged at different semi-solid forging temperatures. The burning characteristics of the alloy are analyzed by a series of burning tests with different burning durations, velocities, and microstructures of burned sample. The results showed that the burning process is highly dependent on the forging temperature, due to the fact that higher temperatures would result in more Ti2Cu precipitate within grain and along grain boundaries. Such a microstructure hinders the transport of oxygen in the stable burning stage through the formation of a kind of oxygen isolation Cu-enriched layer under the burn product zone. This work suggests that the burning resistance of the alloy can be effectively tuned by controlling the temperature during the semi-solid forging process.

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Section: Resultssupporting

confidence: 87%

Tailorable Burning Behavior of Ti14 Alloy by Controlling Semi-Solid Forging Temperature

et al. 2016

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“…1a) which are indicated by the white arrow (according to Ti-Cu phase diagram in Fig S2) [19]. The formation of Ti2Cu in Cu rich Ti alloy matrix is in consistent with literature [16,17]. In comparison, Ti40 alloy exhibit β-Ti matrix microstructure where large grains with clear grain boundaries can be observed ( Fig.…”

Section: Methodssupporting

confidence: 87%

“…To represent burning characteristics with various gas condition, a modified direct current simulation burning (DCSB) method was employed to study the burning behavior of the alloys [16,17]. Alloys were ignited by placing under a certain voltage and current.…”

Section: Controlled Burning Testmentioning

confidence: 99%

Underlying burning resistant mechanisms for titanium alloy

Chen

Yang

et al. 2018

Materials & Design

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The "titanium fire" as produced during high pressure and friction is the major failure scenario for aero-engines. To alleviate this issue, Ti-V-Cr and Ti-Cu-Al series burn resistant titanium alloys have been developed. However, which burn resistant alloy exhibit better property with reasonable cost needs to be evaluated. This work unveils the burning mechanisms of these alloys and discusses whether burn resistance of Cr and V can be replaced by Cu, on which thorough exploration is lacking. Two representative burn resistant alloys are considered, including Ti14 (Ti-13Cu-1Al-0.2Si) and Ti40(Ti-25V-15Cr-0.2Si) alloys. Compared with the commercial non-burn resistant titanium alloy, i.e., TC4 (Ti-6Al-4V) alloy, it has been found that both Ti14 and Ti40 alloys form "protective" shields during the burning process. Specifically, for Ti14 alloy, a clear Cu-rich layer is formed at the interface between burning product zone and heat affected zone, which consumes oxygen by producing Cu-O compounds and impedes the reaction with Ti-matrix. This work has established a fundamental understanding of burning resistant mechanisms for titanium alloys. Importantly, it is found that Cu could endow titanium alloys with similar burn resistant capability as that of V or Cr, which opens a cost-effective avenue to design burn resistant titanium alloys.

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“…They found that Monel 400 (66.5Ni31.5Cu) had the best combustion resistance, followed by 304 stainless steels, and the combustion resistance of gray cast irons was better than carbon steels [27,28]. Titanium can be ignited in air at about 1600 • C because of its low thermal conductivity, high oxygen affinity, and high combustion heat [29][30][31][32]. The combustion characteristics of different titanium alloys such as TC4 [33][34][35], TC11 [36,37], and Ti40 [38,39] were studied by the friction method.…”

Section: Introductionmentioning

confidence: 99%

Combustion of Metals in Oxygen-Enriched Atmospheres

Shao

Xie

Zhang

et al. 2020

Metals

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Metal combustion is one of the main issues threatening service safety in oxygen-enriched atmospheres, leading to unexpected explosions in rocket engines. This paper reviews the recent development of metals combustion in oxygen-enriched atmospheres. Test methods under three typical conditions and combustion behaviors of three typical metals are mainly discussed. The microstructures of the combustion areas of tested samples in stainless steels, nickel superalloys, and titanium alloys are similar, containing an oxide zone, a melting zone, and a heat-affected zone. The development trend of metal combustion in oxygen-enriched atmospheres in the future is also forecasted.

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Burn-resistant behavior and mechanism of Ti14 alloy

Cited by 21 publications

References 8 publications

Tailorable Burning Behavior of Ti14 Alloy by Controlling Semi-Solid Forging Temperature

Tailorable Burning Behavior of Ti14 Alloy by Controlling Semi-Solid Forging Temperature

Underlying burning resistant mechanisms for titanium alloy

Combustion of Metals in Oxygen-Enriched Atmospheres

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