Microstructure and high cycle fatigue fracture surface of a Ti–5Al–5Mo–5V–1Cr–1Fe titanium alloy

Abstract

Because of the requirements for the damage tolerance and fatigue life of commercial aircraft components, the high cycle fatigue (HCF) properties of Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy forgings are important. The effects of microstructure types of the α + β titanium alloy on fatigue properties need to be understood. In this paper, by analysing the fracture surfaces of the titanium alloy having four types of microstructure, the effects of microstructure are investigated. The differences of initiation areas and crack propagation among different microstructures were studied. It was found that the area of the initiation region decreases in the order of coarse basketweave, fine basketweave, Widmanstätten, and bimodal microstructure.

Effect of microstructure on high cycle fatigue behavior of Ti–5Al–5Mo–5V–3Cr–1Zr titanium alloy

“…, which is similar to the reported results in Ref. [8]. Moreover, major cracks initiate at grain boundary for LM.…”

“…Furthermore, there are a large number of spreading rays on the fracture surface. Judging by the reversal of the spreading direction, fatigue fracture cracks initiation sites can be obtained[8], as the red frame indicated inFig. 5a and Fig.…”

An overview of Direct Laser Deposition for additive manufacturing; Part II: Mechanical behavior, process parameter optimization and control

“…lamellar) microstructure at 10 7 cycles, and its comparison to wrought TC18 with lamellar and bimodal microstructures, is presented in Fig. 9 [33,104]. It may be seen that DLD TC18…”

“…Tensile properties of LENS Ti-6Al-4V in different building orientations after heat treatment and HIP process [24]. Comparison of fatigue strength of direct laser-deposited TC18 specimens [104] to wrought TC18 with Widmanstätten (lamellar) and bi-modal microstructures [33] at 10 7 cycles. The S-N data for the Inconel 718 specimens fabricated with the LENS technique [44].…”

Estudo do comportamento em fadiga de alto ciclo da liga Ti-13V-11Cr-3AI

“…No entanto, nos estudos de Wu, que avaliou a influência da microestrura na superfície de fratura por fadiga de alto cico da liga Ti-5Al-5Mo-5V-Cr-Fe, observa-se que a microestrura tem grande influência nos períodos de iniciação da trinca e fratura nas condições de alto ciclo, mas tem uma influência muito pequena na propagação da trinca (WU et al, 2013).…”