Ti55531钛合金热轧对α相析出行为及力学性能的影响

doi:10.13251/j.issn.0254-6051.2025.09.012

摘要/Abstract

摘要： 对比研究了在780 ℃固溶+500 ℃时效(STA)和780 ℃热轧+780 ℃固溶+500 ℃时效(RSTA)两种工艺处理后得到的不同形态初生α_p相和次生α_s相对Ti55531合金力学性能的影响。结果表明:经过STA处理后的显微组织由等轴状的α_p相和含有细针状α_s相的β转变组织构成,具有良好的析出强化效果;经过RSTA处理后的显微组织由椭球状的α_p相和含有片层状α_s相的β转变组织构成,再结晶程度的提高同时带来了显著的细晶强化。STA试样的抗拉强度达到1523 MPa,而断裂总延伸率仅有2.99%,这是由于含有细针状α_s相的β转变组织承担塑性变形的能力较差,以及较软的等轴α_p相与硬的β转变组织变形协调性差导致的。而RSTA试样的抗拉强度为1483 MPa,断裂总延伸率为5.35%,这是由于片层状α_s相通过剪切和弯曲变形提高了β转变组织承担塑性变形的能力,同时经过位错强化的α_p相与β转变组织的变形协调性更好,进一步提高了塑性。因此,经过RSTA处理的样品具有更加优异的强塑性匹配。

关键词: 钛合金, 热轧, 固溶, 时效, 组织性能, 强塑化

Abstract: Effects of morphologies of the primary α_p phase and secondary α_s phase on the mechanical properties of the Ti55531 alloy, obtained after two processes—solid solution treatment at 780 ℃ followed by aging at 500 ℃ (STA) and hot rolling at 780 ℃ then followed by solid solution treatment at 780 ℃ and aging at 500 ℃ (RSTA) were investigated. The results show that the microstructure after the STA treatment consists of equiaxed α_p phase and β-transformed microstructure containing fine, needle-like α_s phase, exhibiting a strong precipitation strengthening effect. The microstructure after the RSTA treatment consists of ellipsoidal α_p phase and β-transformed microstructure with lamellar α_s phase. The RSTA state specimens exhibit a higher degree of recrystallization, and the fine-grain strengthening effect resulting from recrystallization largely compensates for the lack of precipitation strengthening. For mechanical properties, the tensile strength of the STA state specimen achieves 1523 MPa with total extention of only 2.99%. This limited elongation is attributed to the poor ability of the β-transformed microstructure containing fine needle-like α_s phase to accommodate plastic deformation, as well as the inadequate coordination between the softer equiaxed α_p phase and the harder β-transformed microstructure during deformation. Consequently, there is not a significant difference in strength between the two groups of specimens. The tensile strength of the RSTA state specimens is 1483 MPa, with an total extention of 5.35%. The lamellar α_s phase enhances the ability of the β-transformed microstructure to accommodate plastic deformation through shear and bending mechanisms. Additionally, the improved deformation coordination between the dislocation-strengthened α_p and the β-transformed microstructure further increases the macroscopic plastic deformation capacity of the specimens. As a result, the RSTA state specimens own the superior strength-ductility synergy.

Key words: titanium alloy, hot rolling, solution treatment, aging, microstructure and properties, strengthening and plasticizing

中图分类号:

TG146.2

刘斌华, 李可尔, 赵鹏程, 陈威. Ti55531钛合金热轧对α相析出行为及力学性能的影响[J]. 金属热处理, 2025, 50(9): 76-85.

Liu Binhua, Li Keer, Zhao Pengcheng, Chen Wei. Effect of hot rolling on α-precipitation behavior and mechanical properties of Ti55531 titanium alloy[J]. Heat Treatment of Metals, 2025, 50(9): 76-85.

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