Recrystallization behavior and texture evolution of cryo-rolled GH159 superalloy with an ultra-high strength

Zeng, M.T.; Yang, Ya; Tan, Yuanbiao; Zhang, W.W.; Xiang, Song; Ma, Min; Zhao, F.

doi:10.1016/j.matchar.2023.112656

Cited by 9 publications

(2 citation statements)

References 56 publications

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“…Microstructural heterogeneity can be created through the activation of twin variants at different degrees of deformation [29]. The combination of dislocation and nano-twinning, increased dominance of orientations such as Brass in FCC alloys, and stacking faults at a high degree of deformation result in a monotonic increase in tensile strength and a decrease in ductility in polycrystalline alloys [14,30,31]. The physical mechanisms involved in the formation of the microstructure can be studied to a significant extent using the Electron Back-Scattered Diffraction (EBSD) technique and the principles of quantitative texture analysis and Transmission Electron Microscopy (TEM).…”

Section: Introductionmentioning

confidence: 99%

Optimizing Tensile Properties and Hardness of Inconel 718 by Cold Rolling

Tucho,

Sletsjøe,

Sayyar

et al. 2024

Metals

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The as-received commercial Inconel 718 material was solid solution heat treated (ST), cold-rolled (CR), and precipitation-hardened (PH) to investigate the effects of deformation on the tensile properties, hardness, and texture. Three sets of specimens (0%, 20%, and 50% CR) were ST at 1100 °C/1 h, CR, and aged (720 °C/8 h + 650 °C/8 h) for the analysis. The ultimate tensile strength (UTS), 0.2% yield strength (YS), and elongation of 50% deformed condition were 1645 MPa, 1512 MPa, and 3.8%, respectively. The 20% deformation resulted in a balanced UTS (1348 MPa), YS (1202 MPa), and elongation (11%). The contribution of precipitation hardening to the strength decreased, while the contribution of CR increased with an increasing percentage of deformation. As the level of deformation increased, the size and quantity of γ″ decreased proportionally. The CR specimens produced a high density of nano/micro twins with twin planes oriented perpendicular to the RD-ND surface. The gradient of crystal orientation and internal features of large austenitic grains were generated by their preferred rotation. The cross-slip of screw dislocations induced a complete β-fiber consisting of {110}<112>, {112}<111>, and {123}<634>, with doubled intensity at the higher deformation. Additionally, the specimens were highly susceptible to the twinning-induced orientation emerged by a predominant <110>//ND. In the as-deformed condition, an incomplete but intense α-fiber clustered between {110}<001> and {110}<112> was characterized. Apart from achieving the highest strength, the current work demonstrates the effects of CR on the material strength without the complex influences of δ precipitates.

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Section: Introductionmentioning

confidence: 99%

Optimizing Tensile Properties and Hardness of Inconel 718 by Cold Rolling

Tucho,

Sletsjøe,

Sayyar

et al. 2024

Metals

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“…Hamed et al [13] reported that the 90% cold rolling and annealing at 1050 • C promoted the evolution of recrystallization textures of Goss ({110} <001>), Copper ({112} <111>), and R-Brass ({110} <111>) in Incoloy 800H/HT superalloys. Zeng et al [20] found that the textural composition in cold-rolled GH159 superalloy was weakened by annealing, showing weak textural fractions of Goss, Cube, {552} <115> and Copper.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Recrystallization Texture in A286 Iron-Based Superalloy Thin Plates Rolled via Various Routes

Zhang,

Wang

et al. 2023

Metals

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The A286 iron-based superalloy has wide-ranging applications in replacing expensive nickel-based and cobalt-based superalloy to manufacture the turbine disk as well as the pipelines and valves of the fourth-generation supercritical water reactor (SCWR) working below 650 °C. The recrystallization texture importantly affects the mechanical properties and oxidation resistance of superalloys. However, very few investigations are available on the recrystallisation texture of A286 alloy. The current work reports the texture of A286 alloy fabrication using various rolling routes, including one-stage cold rolling with the rolling rates of 83% (Route I) and 91% (Route II), and two-stage cold rolling with the rolling rate of 83% + 50% (Route III). Route III is preferentially recommended to manufacture A286 alloy thin plates due to the obviously reduced work hardening as well as the weakened recrystallization texture and anisotropy; moreover, compared with other routes, the recrystallized grain size of Route III did not significantly coarsen. We also revealed the mechanism for the effect of cold rolling textures on the final recrystallization texture and the role of the deformation twin in {110} <115> grain. In this study, recrystallization texture develops through two independent mechanisms related to different deformation microstructures, including the recrystallization texture inherited from deformation texture and the recrystallization texture depended on deformation twins.

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