(北京航空材料研究院 航空材料檢測(cè)與評(píng)價(jià)北京市重點(diǎn)實(shí)驗(yàn)室，北京 100095)
摘 要: 在Gleeble-3800熱模擬機(jī)上對(duì)電渣熔鑄態(tài)鎳銅合金NCu30-4-2-1進(jìn)行高溫?zé)釅嚎s實(shí)驗(yàn)，研究該合金在900~1 100 ℃和應(yīng)變速率為0.01~10 s-1條件下的流變應(yīng)力行為。結(jié)果表明：在變形初期，隨著應(yīng)變的增加，流變應(yīng)力增大，出現(xiàn)峰值后逐漸趨于平穩(wěn)；隨著溫度的升高，峰值應(yīng)力減小，而隨著應(yīng)變速率的增大，峰值應(yīng)力增大，求得鎳銅合金NCu30-4-2-1的熱變形激活能Q為416.5 kJ/mol，Zener-Hollomon參數(shù)的對(duì)數(shù)和峰值應(yīng)力的對(duì)數(shù)較好地滿足線性關(guān)系，建立了鎳銅合金NCu30-4-2-1的流變應(yīng)力方程；合金的顯微組織受變形溫度和顯微組織的影響，變形溫度越高，應(yīng)變速率越低，越有利于動(dòng)態(tài)再結(jié)晶的發(fā)生。
關(guān)鍵字: 鎳銅合金NCu30-4-2-1；熱壓縮變形；流變應(yīng)力；變形激活能；動(dòng)態(tài)再結(jié)晶
（Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,
Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:The flow stress behavior of nickel-copper alloy NCu30-4-2-1 electroslag castings during hot compression was studied by thermal simulation test at the deformation condition of 900-1 100 ℃ and 0.01-10 s-1 on the Gleeble-3800 thermal-mechanical simulator. The results show that the flow stress increases with increasing strain and tends to be constant after a peak value. The peak stress increases with increasing strain rate, and decreases with increasing deformation temperature. The calculated hot deformation activation energy is 416.5 kJ/mol. The logarithm of Zener-Hollomon parameter has a good linear relationship with the logarithm of peak stress, and the flow stress equation of nickel-copper alloy NCu30-4-2-1 was established. The microstructure strongly depends on the deformation temperature and strain rate, and lower strain rate promotes the dynamic recrystallization.
Key words: nickel-copper alloy NCu30-4-2-1; hot compression deformation; flow stress; hot deformation activation energy; dynamic recrystallization
