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<p>We present the results of experimental determination of the emissivity coefficient&#xa0;ε of furnace and air scale for Ti–6Al–4V alloy (an analog of the Russian VT6 alloy), which is one of the most extensively used titanium alloys. According to GOST R ISO 18434-1-2013, the procedure of measurements is based on the simultaneous recording of temperature in the course of cooling of a&#xa0;cylindrical sample by using contact and noncontact methods with subsequent determination of&#xa0;ε from the equality of both values. On the basis of the obtained data, we formed samples and computed the average values of &lt;ε&gt; equal to 0.876 and 0.572 for the furnace and air scales, respectively. A&#xa0;significant dependence of the emissivity coefficient on the temperature of the sample was not detected. The process of cooling of the sample from the initial heating temperature was simulated by the finite-element method. It is shown that the numerical and experimental data exhibit both qualitative and a&#xa0;quantitative agreement at five reference surface points (the relative error is not greater than 2%). The obtained results can be used to monitor the values of temperature in the course of heating and deformation treatment of the Ti–6Al–4V alloy in the industry.</p>

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Determination of the spectral emissivity coefficient of furnace and air-oxide scale of Ti–6Al–4V titanium alloy

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • A. Yu. Postylyakov,
  • V. A. Gol’tsev,
  • A. A. Koksharov,
  • D. L. Shvarts

摘要

We present the results of experimental determination of the emissivity coefficient ε of furnace and air scale for Ti–6Al–4V alloy (an analog of the Russian VT6 alloy), which is one of the most extensively used titanium alloys. According to GOST R ISO 18434-1-2013, the procedure of measurements is based on the simultaneous recording of temperature in the course of cooling of a cylindrical sample by using contact and noncontact methods with subsequent determination of ε from the equality of both values. On the basis of the obtained data, we formed samples and computed the average values of <ε> equal to 0.876 and 0.572 for the furnace and air scales, respectively. A significant dependence of the emissivity coefficient on the temperature of the sample was not detected. The process of cooling of the sample from the initial heating temperature was simulated by the finite-element method. It is shown that the numerical and experimental data exhibit both qualitative and a quantitative agreement at five reference surface points (the relative error is not greater than 2%). The obtained results can be used to monitor the values of temperature in the course of heating and deformation treatment of the Ti–6Al–4V alloy in the industry.