Effect of Heat Treatment on the Microstructure and Mechanical Properties of the Modified 718 Alloy

Han, Di; Yu, Lianxu; Liu, Fang; Zhang, Bin; Sun, Wei

doi:10.1007/s40195-018-0790-9

Cited by 16 publications

(6 citation statements)

References 32 publications

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“…Moreover, the UTS (1651 MPa) for the SAD sample is higher than that reported by Ran et al (1488.98 MPa), [10] Chen et al (1635 MPa), [11] Zhu et al (1404 MPa), [28] and Han et al (1479 MPa). [29] Meanwhile, the FE of the SAD sample is higher than or closes to the previously reported value. Table 1 shows that the average microhardness (AMH) values of SDA and SAD samples are 497 AE 17 and 539 AE 12 HV, respectively.…”

Section: Mechanical Propertiessupporting

confidence: 78%

Improving Mechanical Properties of GH4169 Alloys by Reversing the Deformation and Aging Sequence

2021

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Herein, the microstructure evolution and mechanical properties of GH4169 alloys obtained by solution treatment-deformation-two-stage aging (SDA) and solution treatment-two-stage aging-deformation (SAD) are investigated. The results show that the density of average geometrically necessary dislocations and the size of γ" precipitates in the SAD sample are larger than that in the SDA sample. The ultimate tensile strength (UTS) of the SAD sample is 1651 AE 24 MPa, which is 171 MPa higher than that of the SDA sample, whereas the fracture elongation of the SAD sample decreases only 3.4%. The significant increment of the UTS in the SAD samples is attributed to the contributions of the dislocation strengthening and precipitation strengthening. SAD processing could be considered as a more effective approach to enhance the mechanical properties of GH4169 alloys.

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Section: Mechanical Propertiessupporting

confidence: 78%

Improving Mechanical Properties of GH4169 Alloys by Reversing the Deformation and Aging Sequence

2021

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“…There are extensively experimental investigations on Ti–Nb–Zr RMEAs, ,, Ti–Nb–Zr–Ta, ,,, Ti–Nb–Zr–Mo, − , and Ti–Nb–Zr–Hf–Ta , RHEAs. The Sn can restrain the formation of the α″ phase and ω phase and alter the mechanical properties of Ti alloys. − Alternatively, Sn has a strong interaction with other elements, and it can also reduce the density and increase the effect of solid solution strengthening of alloys . Hence, in our current work, we systematically investigate the elastic moduli and mechanical properties of Ti–Nb–M (M = Zr, Mo, Sn, Ta) RMEAs.…”

Section: Introductionmentioning

confidence: 99%

“…52−54 Alternatively, Sn has a strong interaction with other elements, and it can also reduce the density and increase the effect of solid solution strengthening of alloys. 55 Hence, in our current work, we systematically investigate the elastic moduli and mechanical properties of Ti−Nb−M (M = Zr, Mo, Sn, Ta) RMEAs. Furthermore, the ratio of alloying elements in RMEAs is abundant according to extensive experimental findings.…”

Section: Introductionmentioning

confidence: 99%

Alloying Effect on Elastic and Mechanical Properties of Refractory Medium-Entropy Alloys from First-Principles Calculations

Liu

Zhang

et al. 2023

J. Phys. Chem. C

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There is still a challenge to rapidly and accurately acquire the composition dependence of mechanical properties of multi-principal element alloys due to their huge composition space and complex electronic structures. Aiming to straightforwardly tune the mechanical properties through alloying, we systematically calculate the elastic and mechanical properties for four selected body-centered-cubic (bcc) Ti− Nb−M (M = Zr, Mo, Sn, Ta) refractory medium-entropy alloys (RMEAs) using a first-principles method. It is shown that the elastic stability of the bcc RMEAs can be significantly (weakly) improved with the increase in Nb, Mo, and Ta (Sn) content, but it is insensitive to Zr. The elastic stability, elastic modulus, hardness, and strength generally enhance, whereas Pugh's ratio and Zener anisotropy (A Z ) decrease with the increase in valence electron concentration. Additionally, there is a correlation between the magnitude of the A Z and the shape of the single-crystal Young's modulus (E [hkl] ). The largest (smallest) E [hkl] appears in the <111> (<100>) direction. Particularly, the most isotropic Ti 60 Nb 20 Mo 20 has the highest hardness and strength among all the Ti−Nb−M alloys. Moreover, the change of elastic properties induced by alloying is related to the change of density of states. This work sheds deep light on the design of high-performance Ti-based multi-principal element alloys.

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“…Low [ 17 ] concluded that heat treatments that dissolve intermetallic components and eutectic phases would eliminate the possibility of liquefaction at lower temperatures and improve crack resistance. Han [ 18 ] concluded that thermal cracking occurs during the solidification of molten metal under laser heating and that the crack length can be reduced by decreasing the heat input. Keivanloo [ 19 ] found that reducing the cooling rate reduced residual stresses and decreased crack sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Pulsed Laser Spot Welding Thermal-Shock-Induced Microcracking of Inconel 718 Thin Sheet Alloy

Shi

Wang

et al. 2023

Materials

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This paper investigates the change in solidification microcrack susceptibility under the influence of thermal-shock-induced effects for pulsed laser spot welding molten pools with different waveforms, powers, frequencies, and pulse widths. During the welding process, the temperature of the molten pool under the effect of thermal shock changes sharply, triggering pressure waves, creating cavities in the molten pool paste area, and forming crack sources during solidification. The microstructure near the cracks was analyzed using a SEM (scanning electron microscope) and EDS (electronic differential system), and it was found that bias precipitation occurred during the rapid solidification of the melt pool, and a large amount of Nb elements were enriched in the interdendritic and grain boundaries, which eventually formed a liquid film with a low melting point, known as a Laves phase. When cavities appear in the liquid film, the chance of crack source formation is further increased. Using a slow rise and slow fall waveform is good for reducing cracks; reducing the peak laser power to 1000 w is good for reducing cracks in the solder joint; increasing the pulse width to 20 ms reduces the degree of crack damage; reducing the pulse frequency to 10 hz reduces the degree of crack damage.

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Effect of Heat Treatment on the Microstructure and Mechanical Properties of the Modified 718 Alloy

Cited by 16 publications

References 32 publications

Improving Mechanical Properties of GH4169 Alloys by Reversing the Deformation and Aging Sequence

Improving Mechanical Properties of GH4169 Alloys by Reversing the Deformation and Aging Sequence

Alloying Effect on Elastic and Mechanical Properties of Refractory Medium-Entropy Alloys from First-Principles Calculations

Pulsed Laser Spot Welding Thermal-Shock-Induced Microcracking of Inconel 718 Thin Sheet Alloy

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