Surface characterization of cast Ti-6Al-4V in hydrofluoric-nitric pickling solutions

Say, Wen C.; Tsai, Yu Yu

doi:10.1016/s0257-8972(03)00747-3

Cited by 45 publications

(23 citation statements)

References 17 publications

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“…The specimens were polished and etched using a solution of hydrogen peroxide, hydrofluoric acid, and nitric acid to examine the grain structure [15].…”

Section: Microstructure Evaluationmentioning

confidence: 99%

Residual Stress Measurements and Structural Integrity Implications for Selective Laser Melted Ti-6al-4v

Knowles

Becker

2012

sajie

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Selective laser melting (SLM) of Ti-6Al-4V has significant potential in the aerospace and biotechnology industries. SLM employs a focused laser beam to melt successive layers of metallic powder into complex components. This process can result in the generation of high thermally-induced residual stresses. These residual stresses, together with micro-flaws/ pores from the inherent fabrication process, may lead to premature fatigue crack initiation and propagation at relatively low cyclic stresses. The hole-drilling strain gauge method was used to evaluate residual stresses within SLM Ti-6Al-4V specimens, with the intention of understanding the associated mechanisms for the successful application of SLM Ti-6Al-4V in industry. OPSOMMING'Selective laser melting' (SLM) van Ti-6Al-4V het aansienlike potentiaal in die lugvaart en biotegnologiese bedrywe. SLM maak gebruik van 'n gekonsentreerde laser straal om agtereenvolgende lae metaal poeier te smelt en sodoende intrieke metal komponente te vorm. Gedurende SLM kan hoë resterende spanning veroorsaak word as gevolg van hoë temperature. Hierdie spanning, asook mikrodefekte wat gedurende die vormingsproses ontstaan, mag lei tot voortydige materiaalverswakking deur spleet vorming en verspreiding gedurende betreklik lae sikliese spannings. Resterende spanning in Ti-6Al-4V eksemplare is bereken deur 'n boor-versonke rekstrokie metode om sodoende die meganismes verantwoordelik vir die suksessvolle toepassing van SLM in die Ti-6Al-4V bedryf te bepaal.

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“…The specimens were polished and etched using a solution of hydrogen peroxide, hydrofluoric acid, and nitric acid to examine the grain structure [15].…”

Section: Microstructure Evaluationmentioning

confidence: 99%

Residual Stress Measurements and Structural Integrity Implications for Selective Laser Melted Ti-6al-4v

Knowles

Becker

2012

sajie

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“…Say [4] proposes a similar attack reaction for the pickling of the alloy TB (Table 1), by HF (R2). Nevertheless, attack by HF alone is not recommended because of the hydrogen embrittlement of the alloy:…”

Section: M) ([2] [3] [4]mentioning

confidence: 99%

Analytical Method to Monitor Industrial Pickling Baths Initially Constituted by HF, HNO<sub>3</sub>

Dustou¹,

Latapie²,

Chauvet³

et al. 2017

JASMI

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The present study couples the acid/basis titration and the ICP analysis in order to monitor the concentrations of nitric and hydrofluoric acids, and presents into baths used to pickle alloys of titanium or stainless steel, largely employed in the aeronautic industry. The pickling of the alloys releases various metallic cations able to react with HF in order to lead to metal-fluoride complexes and free H + , the last being able to react with the basis. In this study, it was determined: the most significant correlations providing the number of the protons released by the complexation of the metallic cation by the fluoride. The proposed method based on: 1) these correlations; 2) the titration pH = f(V KOH ) curves; and 3) the content of metallic cations determined by ICP, enables the monitoring of the content of HNO 3 and HF into the pickling bath. Assuming that one bath was used for one type of alloy (alloys of Titanium for example, or alloys of stainless steel), then the proposed method appears providing reliable concentration values of both acids as well as metallic cations.

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“…Oxygen atoms occupy the interstitial sites leading to the change in ductility and hardness [16]. Because the α-case appears at the metal surface, it serves as the stress raisers that eventually cause the oxygen-rich zone to crack, leading to the failure of the alloy at lower strain [17,18].…”

Section: Influence Of α-Case On Alloy Mechanical Propertiesmentioning

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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Surface characterization of cast Ti-6Al-4V in hydrofluoric-nitric pickling solutions

Cited by 45 publications

References 17 publications

Residual Stress Measurements and Structural Integrity Implications for Selective Laser Melted Ti-6al-4v

Residual Stress Measurements and Structural Integrity Implications for Selective Laser Melted Ti-6al-4v

Analytical Method to Monitor Industrial Pickling Baths Initially Constituted by HF, HNO<sub>3</sub>

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

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Surface characterization of cast Ti-6Al-4V in hydrofluoric-nitric pickling solutions

Cited by 45 publications

References 17 publications

Residual Stress Measurements and Structural Integrity Implications for Selective Laser Melted Ti-6al-4v

Residual Stress Measurements and Structural Integrity Implications for Selective Laser Melted Ti-6al-4v

Analytical Method to Monitor Industrial Pickling Baths Initially Constituted by HF, HNO&lt;sub&gt;3&lt;/sub&gt;

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

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Analytical Method to Monitor Industrial Pickling Baths Initially Constituted by HF, HNO<sub>3</sub>