(1. 哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱 150001；
2. 北京航空材料研究院, 北京 100095)
摘 要: 實(shí)驗(yàn)與模擬計(jì)算相結(jié)合研究Ti-6Al-4V(TC4)合金在陶瓷殼型離心精鑄條件下，鑄件模數(shù)對(duì)凝固過(guò)程冷速的影響，以及鑄件組織、性能隨模數(shù)和冷速之間的統(tǒng)計(jì)關(guān)系。結(jié)果表明：當(dāng)鑄件模數(shù)較小時(shí)，模數(shù)大小對(duì)凝固過(guò)程冷速影響比較顯著，而隨著模數(shù)的進(jìn)一步增加，當(dāng)M＞7.00 mm時(shí)，鑄件冷卻速度隨模數(shù)變化并不明顯；晶粒尺寸、α/β片層厚度及二次枝晶間距均隨鑄件模數(shù)的增加及冷速的減小而增大，抗拉強(qiáng)度則呈現(xiàn)相反趨勢(shì)。得出了TC4離心精鑄件組織、性能與鑄件模數(shù)和冷速之間定量關(guān)系的表達(dá)式。
關(guān)鍵字: Ti-6Al-4V合金；離心精密鑄造；組織；抗拉強(qiáng)度；冷卻速度；鑄件模數(shù)
centrifugally cast TC4 alloy in ceramic-shell mold
（1. School of Materials Science and Technology, Harbin Institute of Technology, Harbin 150001, China;
2. Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:Both the experimental analyses and computer simulation were conducted to determine the statistical relationship between the structures and mechanical properties of centrifugally cast TC4 alloy in ceramic-shell mould. The results show that, when the cast modulus (M) is smaller, the modulus has significant influence on the cooling rate. But with increasing modulus, the influence of modulus on the cooling rate is weakened while M is larger than 7.00 mm. The grain size, α/β lamellar thickness and secondary dendrite arm spacing all increase with increasing the casting module or decreasing the cooling rate, while the tensile strength varies in an opposite changing manner. The regression functions for the corresponding relationships are given according to the present investigations.
Key words: Ti-6Al-4V alloy; centrifugal casting; structure; tensile strength; cooling rate; cast modulus
