Effect of hydrogen addition on the microstructure of TC21 alloy

Zhu, Tiejun; Li, Miaoquan

doi:10.1016/j.msea.2010.07.071

Cited by 16 publications

(7 citation statements)

References 21 publications

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“…The research efforts to date for TC21 alloy have mainly been focused on heat treatment, microstructure, mechanical properties, high temperature behavior and superplasticity. 18,19 However, little work has been done on the cutting performance of TC21 alloy. The aim of this study is to investigate and analyze the effects of milling parameters and tool wear status on cutting force, and tool life to guide the production when machining titanium alloy TC21.…”

Section: Introductionmentioning

confidence: 99%

Cutting forces and tool failure in high-speed milling of titanium alloy TC21 with coated carbide tools

Zhang

Zhao

Wang

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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TC21 alloy is a new alpha–beta damage tolerance titanium alloy with high strength and high toughness. Little work has been done in the field of machinability analysis since this alloy was developed. The cutting forces and tool wear in high-speed milling of TC21 alloy with physical vapor deposition ((Ti, Al)N-TiN)-coated carbide tools under different cutting conditions were investigated in this article. The results showed that the cutting force component Fx was more dominant of the three components, and the cutting forces presented an increasing trend with the tool wear progress, which in turn deteriorated the cutting condition and accelerated the tool failure progress. The major tool wear modes in high-speed side-milling TC21 alloy with coated carbide were adhesion and chipping on the rake face along with chipping and transverse crack on the flank face. Moreover, there was obvious nose depression from both the rake face and the flank face. Chipping along the flank and rake faces was identified as the main factor responsible for the failure of the coated carbide tools during the milling of titanium alloy TC21.

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Section: Introductionmentioning

confidence: 99%

Cutting forces and tool failure in high-speed milling of titanium alloy TC21 with coated carbide tools

Zhang

Zhao

Wang

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…5 shows that the aged microstructure consists of the primary phase, and eutectoid product precipitates between these primary phases. The eutectoid product is a mixture of acicular a and d, and the primary phase can be either a or d [11,25]. In Ti-H system, the eutectoid point is 1.33 wt% H [14], and in our work, the highest hydrogen content is 0.984 wt% H, which suggests that the primary phase should be a phase.…”

Section: Microstructure At the End Of Agingmentioning

confidence: 54%

“…The increase in the hydrogen facilitates precipitation of d hydride, which is a product of the eutectoid decomposition, so the eutectoid decomposition would also be more complete, and the concentration of b H becomes lower. In a different perspective, the addition of the hydrogen may reduce the b transition temperature, which means the decomposition of b H is inhibited [25,26], and the concentration of b H should be high as a result. It seems that the increase in the hydrogen content can both reduce and raise the content of b H .…”

Section: Microstructure At the End Of Agingmentioning

confidence: 99%

“…In Ti-H system, the eutectoid point is 1.33 wt% H [14], and in our work, the highest hydrogen content is 0.984 wt% H, which suggests that the primary phase should be a phase. However, some studies show that the primary d hydride can precipitates with a quite low hydrogen content (0.885 wt% H) [8,25]. To identify the primary phase in the current work, the primary phase with 0.984 wt% H is dealt with some further TEM observation.…”

Section: Microstructure At the End Of Agingmentioning

confidence: 99%

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Microstructure Evolution and Phase Transformation of Ti–6.5Al–2Zr–Mo–V Alloy During Thermohydrogen Treatment

Kou

Zhang

Chu

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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Thermohydrogen treatment (THT) is an effective way to refine microstructure and improve the mechanical properties of the titanium alloys. In the current work, as-cast Ti-6.5Al-2Zr-Mo-V alloy was hydrogenated with different hydrogen contents and processed solution aging. Accordingly, the microstructure evolution and phase transformation were analyzed. Results show that during solution aging, eutectoid decomposition occurs and the product is a mixture of coarse primary a, fine eutectoid product and undecomposed b H . The size of primary a is closely dependent on the hydrogen content, and large primary a can be obtained at medium hydrogen content. Further, the influence of hydrogen content on the growth of primary a phase was revealed. The primary a is much fine, and the eutectoid product is relatively homogeneous with 0.984 wt% H. After THT, the ultimate strength is beyond 1,100 MPa that has increased by 23.15% compared with that in as-cast state.

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“…Obligeding to the great properties (high yield strength, great strength to weight multiplier and good corrosion resistance) [1,2], steel fusions are widely gone in aerospace and chemical industries. Nevertheless, low hardness and poor wear-friction restrict their use, especially in tribological applications [3,4].…”

Section: Introductionmentioning

confidence: 99%

Research of high-speed HFC-boriding kinetics

Ишков

Shegolev

2021

E3S Web Conf.

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The paper presents studies boride coatings, which were created using high-frequency treatment with currents. Chemical reactions characterized the boriding procedure at various temperatures are show. The choice of the main element, of the reaction-boriding scheme is characterize, their role is revealed, and the probable processes leading to the realization of topochemical boriding initiated by HFC-heating are established. The kinetic curves received during the test at different temperatures are showed. Anamorphoses of the kinetic curves are showed, and the values of activation energy and parameters of the boriding process using HFC-heating are calculated on the basis of linearization of the Arrhenius equation.

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Effect of hydrogen addition on the microstructure of TC21 alloy

Cited by 16 publications

References 21 publications

Cutting forces and tool failure in high-speed milling of titanium alloy TC21 with coated carbide tools

Cutting forces and tool failure in high-speed milling of titanium alloy TC21 with coated carbide tools

Microstructure Evolution and Phase Transformation of Ti–6.5Al–2Zr–Mo–V Alloy During Thermohydrogen Treatment

Research of high-speed HFC-boriding kinetics

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