High Temperature Alloys

Petrushin, N. V.; Chabina, E. B.; Nazarkin, R.M.

doi:10.1007/978-3-540-73036-1_6

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…When the solubility of silicon in titanium is exceeded, silicides are formed. The silicides improve the creep resistance but can also have negative effects on the mechanical properties [62].…”

Section: Discussionmentioning

confidence: 99%

Laser-based powder bed fusion of Ti-6Al-4V powder modified with SiO2 nanoparticles

Emminghaus

Bernhard

Hermsdorf

et al. 2022

Int J Adv Manuf Technol

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In laser-based powder bed fusion of metals (PBF-LB/M), residual oxygen in the processing atmosphere is regarded as disruptive and disadvantageous for the manufacturing process and the resulting component properties. A novel approach to eliminate residual oxygen is to add small amounts of silane to the argon process gas. Silane eliminates residual oxygen and forms SiO2 nanoparticles, which in turn can be incorporated into the powder during the process. It is therefore necessary to evaluate the influence of these nanoparticles admixed to the metal powder. In this work, Ti-6Al-4V powder was modified with pyrogenic SiO2 nanoparticles generated by the reaction of a silane argon gas mixture with ambient air. Modified and unmodified powder was analyzed and processed using statistically designed experiments. An improvement of the flow rate according to DIN EN ISO 4490 (from 33.3 to 32.5 s/50 g) and increase of apparent density according to DIN EN ISO 3923 (from 2.52 to 2.58 g/cm3) could be observed after powder modification. No statistically significant effects of the modification on roughness, porosity, and hardness were found. The results demonstrate that powder modification using silane can lead to enhanced flowability without affecting the PBF-LB processing window of Ti-6Al-4V.

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Section: Discussionmentioning

confidence: 99%

Laser-based powder bed fusion of Ti-6Al-4V powder modified with SiO2 nanoparticles

Emminghaus

Bernhard

Hermsdorf

et al. 2022

Int J Adv Manuf Technol

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“…Alpha-titanium alloys containing aluminum, such as Grade 37 titanium, due to its high strength-to-density ratio and high oxidation resistance up to 650 • C, are widely used in racing applications for exhaust systems. However, while presenting improved tribological properties compared to pure titanium, they show poor wear and fretting resistance [4], and this poses problems when repeated assembling and disassembling of parts is required. This results in difficulties in maintenance and inspection of the components of the exhaust system.…”

Section: Introductionmentioning

confidence: 99%

Improvement in Wear Resistance of Grade 37 Titanium by Microwave Plasma Oxy-Carburizing

2023

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Grade 37 titanium is widely used in racing applications thanks to its oxidation resistance up to 650 °C, but it suffers from poor wear and fretting resistance, especially at high temperature. In this paper, different surface modification techniques, namely, carburizing, coating by PVD-ZrO2 and a novel microwave plasma oxy-carburizing treatment, are investigated in terms of hardness, wear resistance and scratch hardness, compared to the untreated substrate. Numerical simulation allowed optimization of the design of the microwave plasma source, which operated at 2.45 GHz at atmospheric pressure. The proposed microwave plasma oxy-carburizing treatment is localized and can serve to improve the tribological properties of selected regions of the sample; compared to untreated Grade 37 titanium, the oxy-carburized layer presents a decrease in the wear rate at 450 °C against alumina of 54% and an increase in scratch hardness of more than three times.

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Comparison of the Dwell Fatigue Behavior of Ti6242 And Ti6246

Qiu

Lei

et al. 2016

Proceedings of the 13th World Conference on Titanium

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The dwell effects of Ti624x (x=2 to 6) alloys, including dwell fatigue life debit, fracture mode and strain accumulation, were characterized and compared. The different dwell fatigue behaviors of Ti6242 and Ti6246 were attributed on the fundamental level to the dual effects of Mo: It decreases the transus of titanium and, as a slow diffuser, reduces the rate of phase transformation from to . A higher Mo content encourages nucleation of multiple variants of laths and promotes the transition from aligned colonies to basketweave microstructure during cooling after forging. As a result both the grain size and microtexture intensity of grains in the two-phase processed and heat treated microstructure are reduced. Smaller grain size of the alloys with higher Mo content produces smaller slip band spacing and reduces accumulated strain during dwell fatigue, thus reducing propensity for crack initiation.

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High Temperature Alloys

Cited by 3 publications

References 7 publications

Laser-based powder bed fusion of Ti-6Al-4V powder modified with SiO2 nanoparticles

Laser-based powder bed fusion of Ti-6Al-4V powder modified with SiO2 nanoparticles

Improvement in Wear Resistance of Grade 37 Titanium by Microwave Plasma Oxy-Carburizing

Comparison of the Dwell Fatigue Behavior of Ti6242 And Ti6246

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