Forging Grain Control Method of 617 Nickel-based Alloy Rotor Forgings for 700℃Ultra-supercritical Units
An ultra-supercritical unit, nickel-based alloy technology, applied in metal processing equipment and other directions, can solve the problems of high heating temperature, low grain size qualification rate, unstable performance, etc., and achieve the effect of saving energy and improving power generation efficiency
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Embodiment 1
[0032] The ton-level 617 nickel-based alloy ingot, with a size specification of Φ375mm×1000mm, is forged to achieve grain control. The specific implementation steps are as follows:
[0033] Step 1: Pier thickness: first fire, forging temperature: 1160℃~920℃, deformation amount 50%;
[0034] Step 2: Drawing and lengthening: the second fire, forging temperature: 1160°C~920°C, deformation amount 20%;
[0035] Step 3: large deformation and elongation: the third fire, forging temperature: 1180 ℃ ~ 920 ℃, deformation amount 35%, forging grain size 2-5;
[0036] Step 4: Final forming: the fourth fire, forging temperature: 1130°C~920°C, deformation amount 25%.
[0037] Grain detection after forging such as figure 1 As shown, the grain size of forging is 4-6;
Embodiment 2
[0039] 5-ton 617 nickel-based alloy ingot, size specification Φ660mm×1800mm, forging to achieve grain control The specific implementation steps are as follows:
[0040] Step 1: First pier thickness: first fire, forging temperature: 1160°C~920°C, deformation amount 50%;
[0041] Step 2: First drawing and elongation: second firing, forging temperature: 1160°C~920°C, deformation amount 25%;
[0042] Step 3: The second elongation: the third fire, forging temperature: 1160°C~920°C, deformation amount 30%;
[0043] Step 4: Second pier thickening: fourth firing, forging temperature: 1160°C~920°C, deformation amount 50%;
[0044] Step 5: The third elongation: the fifth fire, forging temperature: 1160°C~920°C, deformation amount 20%;
[0045] Step 6: Large deformation and elongation: the sixth fire, forging temperature: 1180°C~920°C, deformation amount 35%, forging grain size 0-4;
[0046] Step 7: Final forming: the seventh firing, forging temperature: 1130°C~920°C, deformation amou...
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