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热轧制工艺对Ti61Al16Cr10Nb8V5多主元合显微组织与力学性能的影响

Effect of Hot Rolling Process on the Microstructure and Mechanical Properties of Ti61Al16Cr10Nb8V5 Multi-Principal Element Alloy

  • 摘要: 本文对固溶后的Ti61Al16Cr10Nb8V5多主元合金(简称Ti61V5合金)进行了高温压缩实验从而得到其热加工图,并由此进一步确定了合金的热轧制工艺范围:温度920−1030℃,应变速率0.001 /s−0.01 /s,单次工程应变量22%−36%。通过控制变量法对Ti61V5合金进行热轧制,发现合金随热轧温度升高和应变量增大而强度先增大后降低,塑性则逐渐增大;强度的变化与细晶强化的先增后降有关,而塑性增大与位错强化逐渐降低有关。980℃−0.001 /s下进行单次应变30%总应变90%的热轧制,可得到抗拉强度1200 MPa,延伸率18%的Ti61V5合金板材,与固溶状态相比,其强度提升约63.7%,塑性提升约45%。

     

    Abstract: The high-temperature compression test was conducted on the solution-treated Ti61Al16Cr10Nb8V5 multi-principal element alloy (referred to as the Ti61V5 alloy) to obtain its processing map, which was further used to determine the optimal hot rolling process parameters: temperature range of 920–1030℃, strain rate of 0.001 /s–0.01 /s, and a single-pass engineering strain of 22%–36%. The Ti61V5 alloy was hot rolled using the controlled variable method, revealing that as the rolling temperature increased and the strain level rose, the strength initially increased and then decreased, while the ductility gradually improved. The variation in strength was attributed to the initial increase and subsequent decrease in grain refinement strengthening, whereas the increase in ductility was associated with the gradual reduction of dislocation strengthening. When hot rolling was performed at 980℃ with a strain rate of 0.001 /s, a single-pass strain of 30%, and a total strain of 90%, the Ti61V5 alloy sheet exhibited a tensile strength of 1200 MPa and an elongation of 18%. Compared with the solution-treated state, the strength increased by approximately 63.7%, and the ductility improved by about 45%.

     

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