A Cast Titanium Alloy Suitable for 560~650℃
A technology of casting titanium alloys and allowances, which is applied in the field of titanium alloys, can solve the problems of strength-plastic mismatch and poor casting performance, reduce the tendency of cracks, improve high-temperature strength and high-temperature creep properties, and reduce the number and size of cracks Effect
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Embodiment 1
[0029] This embodiment is a cast high-temperature titanium alloy, including 86.5% Ti, 5.81% Al, 2.15% Sn, 3.46% Zr, 0.46% Mo, 0.65% Nb, 0.18% Si and 0.53% Ta, the balance is impurity, and described percentage is mass percent.
[0030] A cold crucible suspension melting furnace was used to cast the test bar sample, and the obtained cast cylindrical test bar had a diameter of 14.5 mm and a length of 180 mm. The cast test bar was subjected to hot isostatic pressing at 920°C / 130MPa / 2h to remove internal defects of the casting.
[0031] The test bar after hot isostatic pressing is subjected to solid solution + aging treatment. The heat treatment process is 1030°C / 2h / AC+700 / 2h / AC. The tensile standard sample size and sample tensile test method are in accordance with GB / T228- 2010 for implementation. The tensile properties of test bars at different temperatures are shown in Table 2, where σ b is the tensile strength, σ 0.2 is the yield strength, and δ is the elongation.
Embodiment 2
[0033] This embodiment is a cast high-temperature titanium alloy, including 86.3% Ti, 5.89% Al, 1.8% Sn, 3.47% Zr, 0.81% Mo, 0.63% Nb, 0.16% Si, 0.48% Ta and 0.06% of C, the balance is impurities, and the stated percentages are mass percentages.
[0034] The preparation method, hot isostatic pressing and heat treatment process of the test bar in this example are the same as those disclosed in Example 1, and Table 2 shows the tensile properties of the test bar at different temperatures.
Embodiment 3
[0036] This embodiment is a cast high-temperature titanium alloy, including 86.1% Ti, 5.7% Al, 2.3% Sn, 3.4% Zr, 0.9% Mo, 0.5% Nb, 0.12% Si, 0.7% Ta, the balance is impurity, and described percentage is mass percent. Use the cold crucible suspension smelting furnace to pour the cracked cup sample, conduct the penetration test analysis on the poured cracked sample, and compare the number and size of the cracks produced. The results are shown in Table 2. figure 1 A schematic diagram of the crack after coloring the cracked cup is given.
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