Influence of Zr on intergranular corrosion of cast and cryorolled D16 aluminum alloy

Маркушев, М. В.; Krymskiy, S. V.; Ilyasov, Rafis; Avtokratova, Elena; Khazgalieva, A A; Sitdikov, Oleg

doi:10.22226/2410-3535-2017-4-447-451

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…D16 is rarely used in its pure form since it has less strength and hardness in the non-quenched state. The alloy is classified as a durable thermo-hardened material [41,42].…”

Section: Methodsmentioning

confidence: 99%

Wire Tool Electrode Behavior and Wear under Discharge Pulses

et al. 2020

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This work is devoted to researching the tool electrode behavior and wear under discharge pulses at electrical discharge machining. The experiments were conducted on the workpieces of 12Kh18N10T (AISI 321) chrome-nickel anti-corrosion steel and D16 (AA 2024) duralumin by a 0.25-mm-diameter CuZn35 brass tool in a deionized water medium. The developed diagnostic and monitoring mean based on acoustic emission registered the oscillations accompanying machining at 4–8 kHz. The obtained workpiece and non-profiled tool surfaces were investigated by optical and scanning electron microscopy. Calculated volumetric and mass removal rates showed the difference in the character of wear at roughing and finishing. It was shown that interaction between material components in anti-corrosion steel machining had an explosive character between Zn of brass and Ni of steel at a micron level and formed multiple craters of 30–100 µm. The secondary structure and topology of worn tool surfaces were caused by material sublimation, chemical interaction between material components at high heat (10,000 °C), explosive deposition of the secondary structure. Acoustic diagnostics adequately registered the character of interaction. The observed phenomena at the submicron level and microstructure of the obtained surfaces provide grounding on the nature of material interactions and electrical erosion wear fundamentals.

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“…D16 is rarely used in its pure form since it has less strength and hardness in the non-quenched state. The alloy is classified as a durable thermo-hardened material [41,42].…”

Section: Methodsmentioning

confidence: 99%

Wire Tool Electrode Behavior and Wear under Discharge Pulses

et al. 2020

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“…This type of chromium-nickel steel dominates the modern rolled metal market [25][26][27][28]. Duralumin is used mainly in a quenched state and is classified as a durable thermo-hardened construction material for the aerospace industry and unsuitable for welding [29,30]. A Fischer Sigmascope SMP10 instrument (Helmut Fischer GmbH, Sindelfingen, Germany) controlled the specific electrical resistance ρ (Figure 3d, Table 5).…”

Section: Materials To Be Machinedmentioning

confidence: 99%

Sub-Microstructure of Surface and Subsurface Layers after Electrical Discharge Machining Structural Materials in Water

Grigoriev

Волосова

Okunkova

et al. 2021

Metals

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The material removal mechanism, submicrostructure of surface and subsurface layers, nanotransformations occurred in surface and subsurface layers during electrical discharge machining two structural materials such as anti-corrosion X10CrNiTi18-10 (12kH18N10T) steel of austenite class and 2024 (D16) duralumin in a deionized water medium were researched. The machining was conducted using a brass tool of 0.25 mm in diameter. The measured discharge gap is 45–60 µm for X10CrNiTi18-10 (12kH18N10T) steel and 105–120 µm for 2024 (D16) duralumin. Surface roughness parameters are arithmetic mean deviation (Ra) of 4.61 µm, 10-point height (Rz) of 28.73 µm, maximum peak-to-valley height (Rtm) of 29.50 µm, mean spacing between peaks (Sm) of 18.0 µm for steel; Ra of 5.41 µm, Rz of 35.29 µm, Rtm of 43.17 µm, Sm of 30.0 µm for duralumin. The recast layer with adsorbed components of the wire tool electrode and carbides was observed up to the depth of 4–6 µm for steel and 2.5–4 µm for duralumin. The Levenberg–Marquardt algorithm was used to mathematically interpolate the dependence of the interelectrode gap on the electrical resistance of the material. The observed microstructures provide grounding on the nature of electrical wear and nanomodification of the obtained surfaces.

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“…This type of chromium-nickel steel dominates the modern rolled metal market [40][41][42][43]. Duralumin is used mainly in a quenched state and is classified as a durable thermohardened construction material for the aerospace industry and unsuitable for welding [44,45]. The specific electrical resistance ρ of the workpieces and wire tool electrode was controlled using a Fischer Sigmascope SMP10 device (Helmut Fischer GmbH, Sindelfingen, Germany) (Table 5) that measures the percentage of the control sample's electrical conductance made of annealed bronze in the range of 1-112%.…”

Section: Materials To Be Machinedmentioning

confidence: 99%

Elemental and Thermochemical Analyses of Materials after Electrical Discharge Machining in Water: Focus on Ni and Zn

et al. 2021

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The mechanism of the material destruction under discharge pulses and material removal mechanism based on the thermochemical nature of the electrical erosion during electrical discharge machining of conductive materials were researched. The experiments were conducted for two structural materials used in the aerospace industry, namely austenite anticorrosion X10CrNiTi18-10 (12kH18N10T) steel and 2024 (D16) duralumin, machined by a brass tool of 0.25 mm in diameter in a deionized water medium. The optimized wire electrical discharge machining factors, measured discharge gaps (recommended offset is 170–175 µm and 195–199 µm, respectively), X-ray photoelectron spectroscopy for both types of materials are reported. Elemental analysis showed the presence of metallic Zn, CuO, iron oxides, chromium oxides, and 58.07% carbides (precipitation and normal atmospheric contamination) for steel and the presence of metallic Zn, CuO, ZnO, aluminum oxide, and 40.37% carbides (contamination) for duralumin. For the first time, calculating the thermochemistry parameters for reactions of Zn(OH)2, ZnO, and NiO formation was produced. The ability of Ni of chrome–nickel steel to interact with Zn of brass electrode was thermochemically proved. The standard enthalpy of the Ni5Zn21 intermetallic compound formation (erosion dust) ΔH0298 is −225.96 kJ/mol; the entropy of the crystalline phase Scint is 424.64 J/(mol·K).

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Influence of Zr on intergranular corrosion of cast and cryorolled D16 aluminum alloy

Cited by 4 publications

References 6 publications

Wire Tool Electrode Behavior and Wear under Discharge Pulses

Wire Tool Electrode Behavior and Wear under Discharge Pulses

Sub-Microstructure of Surface and Subsurface Layers after Electrical Discharge Machining Structural Materials in Water

Elemental and Thermochemical Analyses of Materials after Electrical Discharge Machining in Water: Focus on Ni and Zn

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