Preparation method of Ti6Al7Nb titanium alloy fine-grain wire material
A titanium alloy and fine-grained technology, which is applied in the field of preparation of Ti6Al7Nb titanium alloy fine-grained wire, can solve problems such as difficult to stably produce Ti6Al7Nb titanium alloy fine-grained wire, and achieve the effect of fine grain and uniform transverse structure
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[0025] A kind of preparation method of Ti6Al7Nb titanium alloy fine-grain wire material of the present invention, specifically comprises the following steps:
[0026] Step 1: Select a Ti6Al7Nb titanium alloy forging billet with a uniform longitudinal and transverse structure, place it in a box-type resistance furnace and heat it at 10°C to 35°C below the phase transition point. The furnace holding time is 90min to 150min. Pass rolling, the deformation amount of a single fire is 97% to 99%, and the deformation amount of each pass is 10% to 25%;
[0027] Step 2, heating the billet obtained by rolling in step 1 in a tubular furnace, the heating temperature is selected to be 30°C to 60°C below the phase transition point, the heating method is pass-through heating, and 5 to 25 passes of hot drawing are adopted , the cumulative deformation is 70% to 95%, and the deformation per pass is 7% to 25%;
[0028] In step 3, heat-treat the billet hot-drawn in step 2 at 750° C. to 800° C. fo...
Embodiment 1
[0031] Step 1. Select a Ti6Al7Nb titanium alloy forging billet with a uniform longitudinal and transverse structure of Φ100mm, place it in a box-type resistance furnace and heat it at 10°C below the phase transition point. The furnace holding time is 130min, and it is rolled to Φ14 by 27 passes .5mm, the amount of deformation per pass is 10% to 15%;
[0032] Step 2, heating the billet obtained by rolling in step 1 in a tubular furnace, the heating temperature is selected to be 50°C below the phase transition point, the heating method is through heating, and 9 passes are used for hot drawing to Φ7.5mm, The amount of deformation per pass is 12% to 17%;
[0033] In step 3, heat-treat the billet hot-drawn in step 2 at 750° C. for 3 hours, straighten and polish it, and obtain a Ti6Al7Nb titanium alloy fine-grained wire.
Embodiment 2
[0035] Step 1. Select a Ti6Al7Nb titanium alloy forging billet with a uniform longitudinal and transverse structure of Φ95mm, place it in a box-type resistance furnace and heat it at 25°C below the phase transition point. The furnace holding time is 110min, and it is rolled to Φ13 by 25 passes .5mm, the amount of deformation per pass is 15% to 19%;
[0036] Step 2, heating the billet obtained by rolling in step 1 in a tubular furnace, the heating temperature is selected to be 30°C below the phase transition point, the heating method is through heating, and 12 passes are used for hot drawing to Φ6.5mm, The amount of deformation per pass is 7% to 15%;
[0037] In step 3, heat-treat the billet hot-drawn in step 2 at 780° C. for 2 hours, straighten and polish it, and obtain a Ti6Al7Nb titanium alloy fine-grained wire.
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