Air Contamination and Embrittlement of Titanium Alloys

Shamblen, C. E.; Redden, T.K.

doi:10.1016/b978-0-08-006564-9.50027-0

Cited by 26 publications

(17 citation statements)

References 3 publications

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“…In order to do so, nanoindentation traverses were placed in several columns with a biased orientation (∼45˚ relative to the surface) to ensure that the hardness variation is captured in small increments and the data sample is sufficiently large, as shown in Fig. 2(a) According to the work of other researchers focused on the surface diffusion of oxygen during high temperature oxidation of Ti and Ti-based alloys, there is sufficient evidence to establish the existence of a linear relationship between oxygen content and hardness of the metal for a specific oxidation temperature [5,11,[27][28][29][30][31][32]. Therefore, a quantitative description of the Final document prior to publication in Oxidation of Metals Available at http://dx.doi.org/10.1007/s11085-015-9600-1 oxygen ingress as a function of distance from the exposed surface can be made directly from the hardness results.…”

Section: Resultsmentioning

confidence: 99%

“…The nucleation of oxide crystals within the metal substrate ahead of the oxidation front can also take place as a result of concurrent extensive oxygen dissolution and selective oxidation. Drastic changes in the mechanical properties of the subsurface region are inevitable for some metals with high solubility of oxygen [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Systematic Assessment of the Influence of Mo Concentration on the Oxygen Ingress in Ti–Mo System During High Temperature Oxidation

et al. 2015

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To understand the role of composition in the oxidation behavior of Ti-Mo system and to evaluate the extent of oxygen ingress into the metal substrate during high temperature exposure, a compositionally graded Ti-xMo specimen (0 ≤ x ≤ 12 wt% Mo) was prepared using an additive manufacturing technique, solutionized and then subjected to oxidation tests at 650 °C for different exposure times. The depth of oxygen diffusion, across the composition range, was assessed via change in the local hardness and the results were coupled with quantitative measurement of the oxygen concentration. The concentration of O in the α phase was reduced by 90 % after a short distance of 16 μm from the metal/oxide interface while it remained more or less the same in β phase. The solubility of Mo in α phase also approached zero near the surface as O changed the partition coefficient of this element between α and β phases. It was shown that the addition of Mo reduces the solubility of O in the metal substrate which in turn retards the transition point from parabolic to the linear oxidation stage.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Systematic Assessment of the Influence of Mo Concentration on the Oxygen Ingress in Ti–Mo System During High Temperature Oxidation

et al. 2015

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“…For pure titanium, the scatter is of five orders of magnitude for the preexponential constant and 100% for the activation energy. In this study, we focus on the response of Ti-6Al-2Sn-4Zr-2Mo, which has been previously investigated (Shamblen and Redden, 1968;Shenoy et al, 1986). We employ the pre-exponential constant and activation energy values reported by Ref.…”

Section: Modeling Diffusion In Two Dimensionsmentioning

confidence: 99%

“…We employ the pre-exponential constant and activation energy values reported by Ref. (Shamblen and Redden, 1968). In the numerical simulations below, the parameters that characterize the effects of damage on diffusivity: a, x c and x ec is taken to be 3.56, 0.1 and 0.5, respectively.…”

Section: Modeling Diffusion In Two Dimensionsmentioning

confidence: 99%

Computational modeling of titanium structures subjected to thermo-chemo-mechanical environment

Oskay

Haney

2010

International Journal of Solids and Structures

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a b s t r a c tThis manuscript provides a new coupled thermo-chemo-mechanical computational model for titanium structures subjected to extreme loading and environment. The proposed model accounts for the formation of oxygen enriched (alpha-case) titanium, as well as the coupling effects between the response characteristics of mechanical and oxygen infiltration processes into titanium at high temperature environment. The formation of alpha-case at the surface of the structure is modeled as diffusion of oxygen into the titanium substrate. The mechanical response of the structure is idealized using the Johnson-Cook model, which is generalized to account for the effects of oxygen induced embrittlement and hardening. The interplay between mechanical damage, oxygen infiltration and temperature on the chemo-mechanical response is evaluated using numerical simulations. The fully coupled mechanical and diffusion processes are solved based on a staggered coupling algorithm. The capabilities of the computational model are assessed by the analysis of a panel composed of Ti-6Al-2Sn-4Zr-2Mo titanium alloy subjected to thermal shock loading.

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“…Meanwhile, the reaction between metal and alloy will also increase the surface roughness, reducing wear resistance, corrosion resistance and mechanical resistance [13,14]. Fatigue failure was mostly generated from the surface contamination layer [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of the interaction layer on the mechanical properties of Ti–6Al–4V alloy castings

Sha

Cheng

et al. 2016

Materials Chemistry and Physics

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The interaction between the face coat material of a mould and the titanium alloy will cause oxygen penetration during the casting and solidification process, resulting in the formation of an α-case interaction layer at the metal surface that influences the mechanical properties of the cast components. In this study, the influence of α-case thickness and loading positions in a Ti-6Al-4V (Ti64) alloy on metal hardness, impact properties and bending strength was investigated. The results showed that the metal surface α-case consisted of many coarse α laths which has a higher hardness than metal matrix. The mechanical properties of the alloy are influenced by the α-case. The alloy bending strength was observed to have changed linearly with the thickness of sample.

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Air Contamination and Embrittlement of Titanium Alloys

Cited by 26 publications

References 3 publications

Systematic Assessment of the Influence of Mo Concentration on the Oxygen Ingress in Ti–Mo System During High Temperature Oxidation

Systematic Assessment of the Influence of Mo Concentration on the Oxygen Ingress in Ti–Mo System During High Temperature Oxidation

Computational modeling of titanium structures subjected to thermo-chemo-mechanical environment

Effect of the interaction layer on the mechanical properties of Ti–6Al–4V alloy castings

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