摘要
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{1010}晶面上形成了1010//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。
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,recrystalli-zation,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 evolu-tion 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 tempera-tures of 600℃and 700℃,the tensile strength of theϕ31 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 theϕ28 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 theϕ28 mm×0.9 mm tubes with a larger cold-rolled defor-mation was higher than that of theϕ31 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 1010//RD basal double-peak texture on the{1010}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.
作者
沈艺菲
包建兴
刘蒙蒙
李明佳
张鹏飞
马健凯
赵恒章
胥珊娜
SHEN Yifei;BAO Jianxing;LIU Mengmeng;LI Mingjia;ZHANG Pengfei;MA Jiankai;ZHAO Hengzhang;XU Shanna(College of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China;Xi'an Rare Metal Materials Research Institute Co.,Ltd.,Xi'an 710016,China)
出处
《精密成形工程》
北大核心
2026年第3期1-16,共16页
Journal of Netshape Forming Engineering
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)。
关键词
TA18CF
热处理
力学性能
显微组织
织构
TA18CF
annealing temperature
mechanical properties
microstructure
texture
