Effect of Microstructure on the High-Cycle Fatigue Behavior of Ti(43-44)Al4Nb1Mo (TNM) Alloys

Tang, Bin; Zhu, Bin; Bi, Weiqing; Liu, Yan; Li, Jinshan

doi:10.3390/met9101043

Cited by 6 publications

(4 citation statements)

References 34 publications

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“…Asavela et al [49] also produced TiAl alloy with only 6 wt.% of Al (Ti6Al) via LPBF and obtained crackfree components. The literature reveals that a host of other researchers [14,27,47,51] uses TNM powder with Al composition (>43 wt %) could not obtain crack-free components, hence it is evident that the low Al contents and the high content of the b stabilizing elements used by Löber et al [47] enable the production of the crack-free TiAl-based components using the LPBF process. The resultant duplex microstructure obtained by Löber et al [47] is not the ideal microstructure for high-temperature applications [20,21].…”

Section: Encouraging Resultsmentioning

confidence: 99%

“…Nevertheless, the addition of the b stabilizing elements not only enhances the possible production of crack-free TiAl-based alloys but also improved the ductility, damage tolerance at room temperature, and workability of the TiAl-based alloys at elevated temperatures [47,51]. However, the b stabilizing elements should be introduced cautiously in consideration of the resultant microstructural phases that might be present and the intended application of the alloy.…”

Section: Encouraging Resultsmentioning

confidence: 99%

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Additive manufacturing of TiAl-based alloys

Dzogbewu

2020

Manufacturing Rev.

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The ever-increasing demand for developing lightweight, high-temperature materials that can operate at elevated temperatures is still a subject of worldwide research and TiAl-based alloys have come to the fore. The conventional methods of manufacturing have been used successfully to manufacture the TiAl-based alloy. However, due to the inherent limitations of the conventional methods to produce large TiAl components with intricate near-net shapes has limit the widespread application and efficiency of the TiAl components produced using conventional methods. Metal additive manufacturing such as Electron Beam Melting technology could manufacture the TiAl alloys with intricate shapes but lack geometrical accuracy. Laser powder bed fusion (LPBF) technology could manufacture the TiAl-based alloys with intricate shapes with geometrical accuracy. However, the inherent high rate of heating and cooling mechanisms of the LPBF process failed to produce crack-free TiAl components. Various preheating techniques have been experimented, to reduce the high thermal gradient and residual stress during the LPBF process that causes the cracking of the TiAl components. Although these techniques have not reached industrial readiness up to now, encouraging results have been achieved.

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Section: Encouraging Resultsmentioning

confidence: 99%

Section: Encouraging Resultsmentioning

confidence: 99%

Additive manufacturing of TiAl-based alloys

Dzogbewu

2020

Manufacturing Rev.

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“…In the high cycle fatigue, it is well known that fatigue life is dependent on the microstructure and surface conditions as they affect damage accumulation, stress concentration, and crack initiation processes on the material’s surface (stage I) [ 32 , 33 ]. In this case, most of the material’s fatigue life is spent on the initiation and growth of microcracks and not on the propagation of the macrocrack.…”

Section: Discussionmentioning

confidence: 99%

Fatigue Properties of Hot-Dip Galvanized AISI 1020 Normalized Steel in Tension–Compression and Tension–Tension Loading

et al. 2021

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Since hot-dip galvanizing causes a heat effect on cold-worked steel substrate and produces a coating layer comprised of distinct phases with varying mechanical properties, the fatigue mechanism of hot-dip galvanized steel is very complex and hard to clarify. In this study, AISI 1020 steel that has been normalized to minimize susceptibility to the heat effect was used to clarify the effect of the galvanizing layer on the tensile and fatigue properties. The galvanizing layer causes a reduction in the yield point, tensile strength, and fatigue strength. The reduction in the fatigue strength was more significant in the high cycle fatigue at R = 0.5 and 0.01 and in the low cycle fatigue at R = 0.5. The galvanizing layer seems to have very little effect on the fatigue strength at R = −1.0 in the low and high cycle fatigue. Since the fatigue strengths at R = 0.01 and −1.0 in the low cycle fatigue were strongly related to the tensile strength of the substrate, the cracking of galvanized steel was different than that of non-galvanized steel. The fatigue strength of galvanized steel at R = 0.5 dropped remarkably in the low cycle fatigue in comparison to the non-galvanized steel, and many cracks clearly occurred in the galvanizing layer. The galvanizing layer reduced the fatigue strength only under tension–tension loading. We believe that the findings in this study will be useful in the fatigue design of hot-dip galvanized steel.

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“…The TNM alloys, nominal chemical composition Ti-(42-45)Al- (3)(4)(5)Nb-(0.1-2)Mo-(0.1-0.2)B (in at.% percent), are considered to be attractive options for producing light high-temperature structural materials due to their low density, high modulus of elasticity, high creep resistance and oxidation resistance at elevated temperatures [1,2]. At room temperature (RT), the alloys mainly consist of three ordered structural phases, i.e., α 2 phase (D0 19 structure), γ phase (L1 0 structure), and β 0 phase (B2 structure) [3].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characterization and Thermal Stability of TNM Alloy Fabricated by Powder Hot Isostatic Pressing

Wang

Xue

Kou

et al. 2021

Metals

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A TNM alloy ingot was fabricated with powder hot isostatic pressing (P-HIP) and short-time exposure treatment conducted at 750–1050 °C for 2–5 h. The tensile mechanical properties were investigated at room temperature and 800 °C. The results revealed that a fully lamellar microstructure of P-HIPed TNM alloy with only 0.3 vol.% β0 phase could be obtained by hot isostatic pressing at 1260 °C, under the pressure of 170 MPa, held for 4 h. When the exposure temperature was below 850 °C, the α2 lamellae were transformed into nano-scaled (α2 + γ) lamellae (i.e., the α2→α2 + γ transformation). With increases in the exposure temperature, the β0 phase began to precipitate within the α2 lamellae (α2→β0 transformation) at 950 °C. The α2→γ and the α2→β0 transformation both happened at 950–1050 °C, and the higher exposure temperature accelerated the diffusion of Mo and facilitated the α2→β0 transformation. The yield strength and elongation at RT and 800 °C were both improved after short-time high-temperature exposure treatment. The uniform distribution and nano-scaled interfacial β0 phase provided precipitation strengthening and were not harmful to the elongation.

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Effect of Microstructure on the High-Cycle Fatigue Behavior of Ti(43-44)Al4Nb1Mo (TNM) Alloys

Cited by 6 publications

References 34 publications

Additive manufacturing of TiAl-based alloys

Additive manufacturing of TiAl-based alloys

Fatigue Properties of Hot-Dip Galvanized AISI 1020 Normalized Steel in Tension–Compression and Tension–Tension Loading

Microstructure Characterization and Thermal Stability of TNM Alloy Fabricated by Powder Hot Isostatic Pressing

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