(中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室，長沙 410083)
摘 要: 通過熱模擬試驗(yàn)建立TC18合金的Arrhenius型本構(gòu)關(guān)系，采用有限元模擬方法系統(tǒng)研究變形溫度、變形速率和摩擦因數(shù)等因素對TC18縮比盤件等溫模鍛過程的影響，從而得到該合金較合理的模鍛工藝條件，并用于指導(dǎo)具體試驗(yàn)。結(jié)果表明：變形溫度840 ℃、變形速率0.1 mm/s、摩擦因數(shù)0.03為該合金較合理的等溫模鍛變形條件；在有限元模擬工藝的指導(dǎo)下成功鍛造出該合金盤件，并驗(yàn)證有限元模擬結(jié)果的正確性；同時，為其他鈦合金復(fù)雜件的等溫模鍛工藝提供數(shù)值依據(jù)與技術(shù)指導(dǎo)。
關(guān)鍵字: TC18鈦合金；盤件；等溫模鍛；有限元模擬
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Arrhenius constitutive relationship of TC18 Ti alloy obtained from thermal simulation test was used to simulate the isothermal die forging of reduced-scale TC18 disc by finite element method. The suitable deformation conditions were obtained and applied to guide the experiment through systemically investigating the influence of deformation temperature, rate and friction factor on the isothermal die forging process. The result show that the suitable isothermal die forging conditions are that the temperature is 840 ℃, rate is 0.1 mm/s and friction factor is 0.03. The TC18 Ti disc is successfully fabricated under the guidance of finite element simulation, while the accuracy of simulation is also verified by the forging experiment. The related investigation can provide the numerical and technological support for other complex components.
Key words: TC18 Ti alloy; disc; isothermal die forging; finite element method
