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Orientation-Dependent Characteristics for Residual Grains during Hot Deformation of Nickel-Based alloy 925

Acta Metallurgica Sinica(English Letters) 2021年第9期34卷 1296-1306页

作者： Yulong Zhu Yu Cao Rui Luo Cunjian Liu Hongshuang Di Gang Shu Guangjie Huang Qing Liu International Joint Laboratory of Light alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Shenyang National Laboratory for Materials Science Chongqing UniversityChongqing 400044China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China College of Materials Science and Engineering Nanjing Tech UniversityNanjing 211816China

In the present work, the orientation characteristics of residual grains during hot deformation of an age-hardening Ni-Fe-Cr alloy(alloy 925) at different conditions were systematically analyzed through high-resolution electron back-scatter diffraction. Based on the measurement of the kernel average misorientation, the density of geometrical necessary dislocations(GNDs) was further calculated. The orientation-dependent deformation mechanism of the residual grains was also discussed using Schmid factor difference ratio(SFDR) analysis. The results show that the deformed microstructure features typical "necklace" structures. Many distorted twin boundaries can be observed within the residual grains at 950 ℃. When the deformation temperature increases to 1150 ℃, the volume fraction of dynamic recrystallization(DRX) increases, leading to the extensive formation of primary Σ3 twin boundaries. Additionally, the GNDs are widely distributed in the residual grains, while they are rare for the recrystallized grains. The maximum GND density value can be obtained at the interface of "soft–hard" grains. The GND density also increases at higher strain rates, and the number of DRX grains significantly affects the distribution of the GND density. Moreover, based on the calculations and SFDR analysis, it can be summarized that the {100} and {111} grains are prone to deform in the uniserial slip mode and the multiple slip mode, respectively.

关键词： alloy 925 Hot deformation Orientation Geometrically necessary dislocation Schmid factor

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