(1. 西安建筑科技大學(xué) 冶金工程學(xué)院，西安 710055；
2. 金川集團(tuán)股份有限公司，鎳鈷資源綜合利用國(guó)家重點(diǎn)實(shí)驗(yàn)室，金昌 737100；
3. 功能材料加工國(guó)家地方聯(lián)合工程研究中心，西安 710055)
摘 要: 利用Gleeble-3500熱模擬試驗(yàn)機(jī)對(duì)真空感應(yīng)(VIM)+電渣重熔(ESR)所得的GH5605合金鑄錠進(jìn)行熱壓縮實(shí)驗(yàn)，研究其在變形溫度為 950~1200 ℃、應(yīng)變速率為0.001~10 s-1、真應(yīng)變?yōu)?.65時(shí)的熱變形行為。結(jié)果表明：鑄態(tài)GH5605合金的真應(yīng)力-應(yīng)變曲線(xiàn)屬于加工硬化+動(dòng)態(tài)回復(fù)型，分為3個(gè)階段，即Ⅰ劇烈加工硬化階段、Ⅱ平緩加工硬化階段、Ⅲ穩(wěn)態(tài)流變階段。建立的Arrhenius本構(gòu)方程相關(guān)系數(shù)(Rr)和平均相對(duì)誤差(δ)分別為0.95和11.99%，結(jié)合熱加工圖和變形組織分析得出GH5605合金良好的加工區(qū)域?yàn)樽冃螠囟?055~1200 ℃、應(yīng)變速率0.01~0.1 s-1。
關(guān)鍵字: 鈷基高溫合金；熱變形行為；本構(gòu)模型；熱加工圖；顯微組織
（1. College of Metallurgy Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
2. State Key Laboratory of Nickel and Cobalt Resource integrated utilization, Jinchuan Group Co., Ltd., Jinchang 737100, China;
3. National & Local Engineering Researching Center for Functional Materials Processing, Xi’an 710055, China）
Abstract:Hot compression deformation tests of cobalt base superalloy 5605 alloy by vacuum induction electroslag remelting were performed on Gleeble-3500 thermal simulator. The deformation behavior of as-cast GH5605 alloy was studied at the temperature ranging from 950-1200 ℃, strain rate ranging from 0.001 to 10 s-1 with true strain of 0.65. The results show that the true stress-strain curve of GH5605 alloy belongs to the working hardening type + dynamic recovery type. The true stress-strain curve of GH5605 alloy is mainly divided into three stages: Ⅰ severe work hardening stage; Ⅱ gentle work hardening stage; Ⅲ steady stage. The average relative error (δ) of the constitutive model is 11.99%, the correlation coefficients (Rr) is 0.95, the optimum hot working domain for GH5605 alloy is 1055-1200 ℃ and 0.01-0.1s-1.
Key words: cobalt-based superalloy; hot compression deformation; constitutive modeling; processing map; microstructure
