TA10鈦合金鐓拔工藝研究
發(fā)布時間:2018-08-25 19:10
【摘要】:TA10鈦合金在高溫、氯化物溶液和弱還原性酸、硫酸和鹽酸中耐腐蝕性表現(xiàn)優(yōu)良,廣泛應用于換熱器、反應器和蒸餾等設備。TA10鈦合金在重要部件應用都須經(jīng)過開坯鍛造,不同的鍛造工藝條件下,合金的組織和性能差異很大,因此TA10鈦合金開坯鍛造工藝的研究具有重要的實際意義。為給TA10鈦合金大鍛件制定合理的開坯鍛造工藝,首先將TA10鈦合金鑄錠進行一鐓一拔、兩鐓兩拔、三鐓三拔的不同次數(shù)的鐓拔,然后將不同鐓拔次數(shù)后的鍛件切割后分別在600℃、650℃、700℃、750℃進行退火處理,研究鐓拔次數(shù)和退火溫度對TA10鈦合金組織和性能以及斷口形貌的影響,選定合理的鍛造工藝。結果表明:同一鐓拔次數(shù)下,相比于退火處理前,隨著退火溫度的升高,TA10鈦合金的抗拉強度和屈服強度下降越來越多,伸長率上升也越來越多。同一退火溫度下,隨著鐓拔次數(shù)的增加,合金的抗拉強度和屈服強度先上升后下降,伸長率則緩慢增加。隨著退火溫度的升高,TA10鈦合金顯微組織中條狀α的寬度增加;室溫拉伸斷口的準解理斷裂特征逐漸消失,掃描斷口中韌窩增多。退火溫度較高時出現(xiàn)魏氏組織,TA10鈦合金組織的均勻性變差。借助有限元軟件DEFORM-3D模擬了TA10鈦合金小鍛件不同次數(shù)的鐓拔過程,獲得了不同次數(shù)鐓拔過程中合金等效應力及等效應變的變化規(guī)律。二次鐓粗后合金的等效應力達到最大值;二次拔長過程中,工件內部發(fā)生動態(tài)再結晶,等效應力下降;在隨后的三次鐓粗和三次拔長過程中,工件內部加工硬化過程和再結晶過程互相平衡,等效應力在一定范圍內波動變化。兩次鐓拔后工件內部等效應力保持較高水平,驗證了兩鐓兩拔工藝的合理性。最后利用DEFORM-3D模擬了TA10鈦合金大鍛件的兩鐓兩拔鍛造過程,為TA10鈦合金大鍛件的開坯鍛造制定了合理的工藝參數(shù)。
[Abstract]:TA10 titanium alloy has excellent corrosion resistance in high temperature, chloride solution and weak reducing acid, sulfuric acid and hydrochloric acid. It is widely used in heat exchanger, reactor and distillation equipment. The microstructure and properties of the alloy vary greatly under different forging conditions, so it is of great practical significance to study the open forging process of TA10 titanium alloy. In order to establish reasonable open billet forging technology for large TA10 titanium alloy forgings, the TA10 titanium alloy ingot was first upsetting and drawing with one upsetting, two drawing, three upsetting and three drawing. Then, after cutting different upsetting times, the forging was annealed at 600 鈩,
本文編號:2203829
[Abstract]:TA10 titanium alloy has excellent corrosion resistance in high temperature, chloride solution and weak reducing acid, sulfuric acid and hydrochloric acid. It is widely used in heat exchanger, reactor and distillation equipment. The microstructure and properties of the alloy vary greatly under different forging conditions, so it is of great practical significance to study the open forging process of TA10 titanium alloy. In order to establish reasonable open billet forging technology for large TA10 titanium alloy forgings, the TA10 titanium alloy ingot was first upsetting and drawing with one upsetting, two drawing, three upsetting and three drawing. Then, after cutting different upsetting times, the forging was annealed at 600 鈩,
本文編號:2203829
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