Effect of annealing temperature on microstructure and mechanical properties of rolled Mo-Re alloy tubes

doi:10.13251/j.issn.0254-6051.2024.06.021

Abstract

Abstract: In order to address the inherent severe anisotropy issue caused by large plastic deformation in the processing of thin-walled molybdenum-rhenium (Mo-Re) alloy tubes, different annealing temperatures(900, 1050, 1200 ℃) were investigated to control the microstructure and mechanical properties of the Mo-Re alloy thin-walled tubes. The results show that there is a significant <101>//TD texture in the Mo-Re alloy bars, indicating obvious anisotropy. The Mo-Re alloy billet, which is subjected to annealing at 1050 ℃ for 1 h after forging, effectively achieves simultaneous improvement in anisotropy and strength and toughness of the thin-walled molybdenum tube. The room temperature tensile strength reaches 838 MPa, the high-temperature tensile strength at 1300 ℃ reaches 198 MPa, and the average hardness is 230.5 HV0.3. The Mo-Re alloy prepared through annealing at 1050 ℃ for 1 h exhibits excellent strength and toughness, which is mainly attributed to the distribution of grain size after annealing treatment. The average grain size of the Mo-Re alloy bars annealed at 1050 ℃ was 23.1 μm, which is smaller than that of the Mo-Re alloy bars annealed at 1200 ℃, resulting in higher strength and plasticity. Additionally, the concentration of grain size is higher compared to the Mo-Re alloy bars annealed at 900 ℃, indicating better deformation coordination during plastic deformation.

Key words: Mo-Re alloy, annealing temperature, microstructure, mechanical properties

CLC Number:

TG156.25

Chen Cheng, Zhu Qi, Xi Sha, Zeng Xueliang, Zhang Xuesu. Effect of annealing temperature on microstructure and mechanical properties of rolled Mo-Re alloy tubes[J]. Heat Treatment of Metals, 2024, 49(6): 123-128.

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