Effect of Microstructure on Fracture Toughness and Fatigue Crack Growth Behavior of Ti17 Alloy

Rong, Lei; Ji, Yu; Wang, Shijie; Liu, Shuzhen

doi:10.3390/met6080186

Cited by 25 publications

(6 citation statements)

References 19 publications

(30 reference statements)

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“…The tensile strength and 0.2% proof stress at RT were approximately 1200 and 1100 MPa, respectively, which is consistent with the values for Ti-17 alloys with the similar platelet ¡ phase structure in other studies. 16,17) As shown in Fig. 6, the microstructure was restored by solution treatment and the only difference is the volume fraction between the GB and secondary ¡ phases.…”

Section: Tensile Propertymentioning

confidence: 90%

Effect of Forging Temperature on Microstructure Evolution and Tensile Properties of Ti-17 Alloys

et al. 2019

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In this study, the microstructure, tensile strength, elongation, and reduction of area of near-¢ Ti alloys (Ti-17) were investigated after being subjected to solution and aging treatments. Ti-17 was forged at temperatures between 700 and 850°C followed by air cooling. Then, the forged Ti-17 was subjected to solution treatment at 800°C for 4 h followed by water quenching and aging treatment at 620°C for 8 h followed by air cooling. Tensile tests were performed at room temperature, 450°C, and 600°C. The change in microstructure at different forging temperatures was exhibited by only the volume fraction and morphology of the grain boundary (GB) ¡ phase. That is, a granular GB ¡ phase was formed in the samples forged at 700 and 750°C. Moreover, a film-like GB ¡ phase was formed in the samples forged at 800 and 850°C. The tensile strength was the same for all the tested samples, indicating that the microstructure has little effect on the tensile strength. The elongation and reduction of area increased with decreasing volume fraction in the GB ¡ phase. It is considered that the film-like morphology slightly improves ductility.

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Section: Tensile Propertymentioning

confidence: 90%

Effect of Forging Temperature on Microstructure Evolution and Tensile Properties of Ti-17 Alloys

et al. 2019

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“…Long and thick α platelets were found to lead to a good combination of fracture toughness and strength [20]. The fracture toughness and fatigue crack growth behavior of Ti-17 alloy with the bimodal structure produced by processing in the α + β-phase field and the lamellar structure obtained by processing in the β-phase field were investigated [21]. The lamellar structure exhibited superior fracture toughness and a greater fatigue crack growth resistance than the bimodal structure [21].…”

Section: Introductionmentioning

confidence: 99%

“…The fracture toughness and fatigue crack growth behavior of Ti-17 alloy with the bimodal structure produced by processing in the α + β-phase field and the lamellar structure obtained by processing in the β-phase field were investigated [21]. The lamellar structure exhibited superior fracture toughness and a greater fatigue crack growth resistance than the bimodal structure [21]. The effect of globularization of the α phase on the tensile properties was also investigated [22].…”

Section: Introductionmentioning

confidence: 99%

Correlation between Solution Treatment Temperature, MicroStructure, and Yield Strength of Forged Ti-17 Alloys

et al. 2021

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The Ti compressor disks of aviation jet engines are produced by forging. Their microstructure, which depends on the forging conditions, strongly affects their mechanical properties. In this study, changes in the microstructure of Ti-17 alloy as a result of different solution-treatment (ST) temperatures and the related tensile yield strengths were investigated to elucidate the correlation between the ST temperature, microstructure, and yield strength. Ti-17 alloys ingots were isothermally forged at 800 °C and solution-treated at 750, 800, and 850 °C. The microstructure and yield strength were investigated for samples subjected to different ST temperatures. The primary α phase formed during the ST, and the secondary α phase formed during the aging treatment at 620 °C. The yield strength increased with increasing volume fraction of the primary α phase and increased further upon formation of the secondary α phase during the tensile test at room temperature. The correlation of the primary and secondary α phases with yield strength was clarified for tensile properties at room temperature, 450, and 600 °C. An equation to predict the yield strength was constructed using the volume fraction of the primary and secondary α phases.

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“…1) These components are spun with blades to meet both high strength and high fracture toughness requirements. In this case, a thermomechanical processing route to form fully lamella microstructure, which is advantageous for obtaining high fracture toughness, 2,3) is often utilized for Ti-17 material fabrication. 4) In the case of fully lamella microstructure, it is generally known that the most influential microstructural parameter of mechanical properties is the ¡ colony size because it determines the effective slip length; yield stress and ductility are likely to decrease, while crack propagation rate decreases with increasing ¡ colony size.…”

Section: Introductionmentioning

confidence: 99%

Suppression of Grain Boundary α Formation by Addition of Silicon in a Near-β Titanium Alloy

et al. 2019

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The effect of Si addition on the microstructure and mechanical properties of a near-¢ titanium alloy Ti-17 with fully lamella microstructure was investigated. It was found that the microstructure of Ti-17 with silicon exhibited the absence of a continuously thick ¡ layer along prior-¢ grain boundaries (grain boundary ¡), while the grain boundary ¡ was distinctively formed in Ti-17 without Si. The formation of (Ti, Zr) silicide particles at the prior-¢ grain interior and its grain boundaries were observed, and the presence of these particles were related to the disappearance of grain boundary ¡ similar to the oxygen scavenging effect of boride particles reported previously. With regard to mechanical properties, Ti-17 with silicon exhibits higher strength and lower ductility compared with Ti-17 without Si. Ductile transgranular fracture morphology was observed even on the fracture surface of Ti-17 with Si after tensile test. [

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Effect of Microstructure on Fracture Toughness and Fatigue Crack Growth Behavior of Ti17 Alloy

Cited by 25 publications

References 19 publications

Effect of Forging Temperature on Microstructure Evolution and Tensile Properties of Ti-17 Alloys

Effect of Forging Temperature on Microstructure Evolution and Tensile Properties of Ti-17 Alloys

Correlation between Solution Treatment Temperature, MicroStructure, and Yield Strength of Forged Ti-17 Alloys

Suppression of Grain Boundary α Formation by Addition of Silicon in a Near-β Titanium Alloy

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