目的 探究退火温度对冷轧TA18CF管材宏观力学性能与微观组织演变的影响,明确4种退火温度对管材室温拉伸性能、晶粒尺寸、再结晶及晶粒取向的影响规律,为制定和优化TA18CF管材的热处理工艺提供理论依据。方法 对2种冷轧变形量的TA18CF钛合金管材进行不同温度真空退火处理,试验温度分别为500、600、700、800 ℃,保温时间为90 min,采用室温拉伸试验测试管材力学性能,通过OM、SEM、EBSD表征管材拉伸断口形貌、微观组织及织构演变。结果 随着退火温度的升高,2种TA18CF冷轧管的强度逐渐下降,伸长率逐渐升高。在600 ℃和700 ℃退火温度下,ϕ31 mm×1.5 mm冷轧管的抗拉强度分别为853.2 MPa和818.4 MPa,伸长率分别为15.3%和18.5%;ϕ28 mm×0.9 mm冷轧管的抗拉强度分别为858.3 MPa和802.1 MPa,伸长率分别为10.2%和15.7%。随着退火温度的升高,2种冷轧管的再结晶程度增强,微观组织由拉长的变形组织转变为等轴的再结晶组织,且较大冷轧变形量的ϕ28 mm×0.9 mm冷轧管的再结晶程度高于ϕ31 mm×1.5 mm冷轧管。2种冷轧退火管在{0001}晶面上形成了基面ND织构、基面TD织构以及基面双峰织构,在$\{10 \overline{1} 0\}$晶面上形成了$\langle 10 \overline{1} 0\rangle$//RD基面双峰织构,且随着退火温度的升高,基面织构类型未发生明显转变,但管材的径向织构出现减弱趋势。结论 在600 ℃和700 ℃的退火温度下,2种TA18CF冷轧管均获得了较好的强塑性匹配,且能够在消除残余应力的同时,保持管材的径向织构。
Abstract
The work aims to explore the effects of annealing temperatures on the mechanical properties and microstructural evolution of cold-rolled TA18CF tubes, and to clarify the changes in room-temperature tensile properties, grain size, recrystallization, and grain orientation under four different annealing temperatures, thus providing a theoretical basis for developing and optimizing the annealing process of TA18CF tubes. The TA18CF titanium alloy tubes prepared with two cold-rolled deformation amounts were subject to vacuum annealing at temperatures of 500, 600, 700, and 800 ℃ for 90 min. The mechanical properties of the tubes were tested through room-temperature tensile testing. The fracture morphology, microstructure, and texture evolution of the tubes were characterized through OM, SEM, and EBSD. With the increase in the annealing temperature, the strength of both types of TA18CF cold-rolled tubes gradually decreased and the elongation gradually increased. At annealing temperatures of 600 ℃ and 700 ℃, the tensile strength of the ϕ31 mm×1.5 mm cold-rolled tubes was 853.2 MPa and 818.4 MPa, with elongations of 15.3% and 18.5%, respectively. The tensile strength of the ϕ28 mm×0.9 mm cold-rolled tubes was 858.3 MPa and 802.1 MPa, with elongations of 10.2% and 15.7%, respectively. With the increase in the annealing temperature, the degree of recrystallization of the two cold-rolled tubes increased, and the microstructure transitioned from elongated deformed structure to equiaxed recrystallized structure. The recrystallization degree of the ϕ28 mm×0.9 mm tubes with a larger cold-rolled deformation was higher than that of the ϕ31 mm×1.5 mm tubes. Both types of cold-rolled annealed tubes formed basal ND texture, basal TD texture, and basal double-peak texture on the {0001} crystal plane, and a $\langle 10 \overline{1} 0\rangle$//RD basal double-peak texture on the $\{10 \overline{1} 0\}$ crystal plane. With the increase in the annealing temperature, there was no significant change in the basal texture type, but a weakening trend in the radial texture of the tube was observed. At annealing temperatures of 600 ℃ and 700 ℃, both types of TA18CF cold-rolled tubes achieve good strength-plasticity matching, and are able to maintain the radial texture while eliminating residual stress.
关键词
TA18CF /
热处理 /
力学性能 /
显微组织 /
织构
Key words
TA18CF /
annealing temperature /
mechanical properties /
microstructure /
texture
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基金
国家自然科学基金（52305423）; 陕西省自然科学基础研究计划（2023-JC-QN-0518）; 陕西省秦创原引用高层次创新创业人才项目（QCYRCXM-2022-286）; 陕西省重点研发计划（2025CY-YBXM-583）
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