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TA15鈦合金擠壓薄壁型材拉伸性能及差異性研究
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航材院鈦合金型材應(yīng)用研究項(xiàng)目(KZ82171509)


Difference Research on Tensile Properties of TA15 Titanium Alloy Thin Profile Prepared by Hot Extrusion
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    摘要:

    針對(duì)"直接熱擠壓"和"熱擠壓+脈沖鍛打"TA15鈦合金薄壁型材的室溫力學(xué)性能及差異開展實(shí)驗(yàn)研究。通過對(duì)型材不同位置切取的試樣進(jìn)行拉伸試驗(yàn),獲得了型材抗拉強(qiáng)度和屈服強(qiáng)度分布規(guī)律,并對(duì)性能數(shù)據(jù)分布的均勻性和一致性進(jìn)行深入分析。結(jié)果表明,"直接熱擠壓"態(tài)型材的抗拉強(qiáng)度和屈服強(qiáng)度數(shù)值分布較分散,強(qiáng)度離散系數(shù)大于3.5%;而"熱擠壓+脈沖鍛打"態(tài)型材的抗拉強(qiáng)度和屈服強(qiáng)度數(shù)值分布相對(duì)集中,不同批次型材之間的力學(xué)性能一致性較好,強(qiáng)度離散系數(shù)均小于3%。進(jìn)一步分析表明,2種狀態(tài)型材之間的性能差異與型材表面狀態(tài)、表面細(xì)晶層和截面尺寸有關(guān)。脈沖鍛打能夠改善型材表面細(xì)晶層分布的均勻性和截面尺寸精度,從而改善型材力學(xué)性能分布的均勻性和一致性。

    Abstract:

    The room temperature mechanical properties of TA15 titanium alloy thin profiles which prepared by "direct hot extrusion"(DE) and "hot extrusion + pulse forging"(EF) process were studied by tensile test. The distribution regulation of tensile strength and yield strength were obtained by using the samples cut from different locations of profile. Then,the regulation of data distribution was analyzed. The results show that the values of tensile strength and yield strength distribute more scattered and the dispersion coefficient is larger than 3. 5% for DE profiles; By contrast,their distribution are more homogeneous and concentrated for EF profiles. Among different production lots,its distribution of test data is consistent and the dispersion coefficient is lower than 3%. By further analysis,the performance difference between two type profiles is related to surface states,fine grain layer and section size. Pulse forging process can uniform the thickness of fine grain layer and regulate section size,which are benefit for improving mechanical performance of the profile.

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張明杰;齊立春;黃利軍;李雪飛;李煥峰;. TA15鈦合金擠壓薄壁型材拉伸性能及差異性研究[J].鈦工業(yè)進(jìn)展,2020,37(5):7-11.

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  • 在線發(fā)布日期: 2020-11-09
  • 出版日期: 2020-10-25