摘要
对大规格Ti6246合金棒材进行不同温度固溶及相同工艺时效(593℃/8 h/AC)处理,系统研究固溶温度对合金室温、高温拉伸性能以及蠕变性能的影响。结果表明:固溶温度由830℃升高到910℃,Ti6246合金固溶+时效处理后呈现典型的双态组织,初生α相(α_(p))体积分数明显下降,次生α相(α_(s))体积分数增加;室温强度随着固溶温度的升高而增大,固溶温度升至870℃后,室温强度增加趋势减缓,900℃达到峰值,随后开始下降,室温塑性略有下降;高温屈服强度和高温抗拉强度呈升高趋势,断后伸长率则较为稳定;蠕变性能随着固溶温度的升高得到明显改善。Ti6246合金的最佳热处理工艺为900℃/1 h/FAC+593℃/8 h/AC,在此条件下合金具有较好的强塑性匹配以及良好的高温蠕变性能(455℃/550 MPa/32 h)。其中,蠕变总应变为0.677%,残余应变为0.076%,稳态蠕变速率为1.2928×10^(−5)s^(−1)。
Large-sized Ti6246 alloy bars were solution-treated at different temperatures,and then subjected to an identical aging process(593℃/8 h/AC).A systematic study was conducted to explore the impact of solution temperature on the alloy’s room-temperature and high-temperature tensile properties,as well as its creep properties.The findings reveal that as the solution temperature is elevated from 830℃to 910℃,the Ti6246 alloy develops a characteristic duplex microstructure after solution and aging treatment.Specifically,there is a marked reduction in the volume fraction of the primaryαphase(α_(p)),accompanied by an increase in the volume fraction of the secondaryαphase(α_(s)).Regarding mechanical properties,the room-temperature strength of the alloy exhibits a continuous upward trend with increasing solution temperature.Notably,after the solution temperature reaches 870℃,the rate of increase in room-temperature strength slows down,peaking at 900℃before subsequently declining,while the plasticity of the alloy experiences a slight decrease.At high-temperatures,both the yield strength and tensile strength of the alloy demonstrate significant enhancements,with plasticity remaining relatively stable.The creep properties of the alloy are significantly improved with the increase of the solution temperature.The optimal heat treatment for Ti6246 alloy is 900℃/1 h/FAC+593℃/8 h/AC.Under this treatment,the alloy exhibits an outstanding balance of strength and plasticity,coupled with superior high-temperature creep properties(at 455℃/550 MPa/32 h):total strain of 0.677%,residual strain of 0.076%,and steady-state creep rate of 1.2928×10^(−5)s^(−1).
作者
南榕
蔡建华
孙花梅
洪权
赵小花
黄龙超
李钢
毛新平
Nan Rong;Cai Jianhua;Sun Huamei;Hong Quan;Zhao Xiaohua;Huang Longchao;Li Gang;Mao Xinping(Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China;Western Superconducting Technologies Co.,Ltd.,Xi’an 710018,China;AVIC Hunan Institute of Power Machinery Research,Zhuzhou 412002,China)
出处
《钛工业进展》
2025年第6期6-11,共6页
Titanium Industry Progress
