(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. 西安建筑科技大學(xué)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熱模擬機(jī)的熱壓縮實(shí)驗(yàn)，研究了鑄態(tài)GH2132合金在變形溫度為1173~1423 K和應(yīng)變速率為0.001~10 s-1條件下的熱壓縮變形行為和微觀組織演化規(guī)律，分析該合金在不同變形條件下的熱變形激活能Q值、應(yīng)變速率敏感指數(shù)m值、溫度敏感指數(shù)s值的變化規(guī)律，基于動(dòng)態(tài)材料模型(DMM)建立熱加工圖，結(jié)合微觀組織確定出最佳熱加工參數(shù)。結(jié)果表明：隨著變形溫度的升高、應(yīng)變速率的降低，流變應(yīng)力減小，GH2132合金為應(yīng)變速率和溫度敏感型材料。提高變形溫度、降低應(yīng)變速率有利于獲得均勻分布的等軸晶粒。結(jié)合熱加工圖和高溫變形微觀組織確定，鑄態(tài)GH2132合金合理的熱變形參數(shù)所對(duì)應(yīng)的變形溫度和應(yīng)變速率區(qū)間分別為1295~1418 K和3.07~10 s-1。
關(guān)鍵字: 鑄態(tài)GH2132合金；熱變形行為；加工圖
（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 and Local Engineering Researching Center for Functional Materials Processing, Xi’an University of Architecture and Technology, Xi’an 710055, China）
Abstract:The thermal compression deformation behavior and microstructure evolution of as-cast GH2132 alloy were studied by hot compression with Gleeble-3500 thermal simulator at the temperature range of 1173-1423 K and strain rate of 0.001-10 s-1. The deformation activation energy (Q), strain rate sensitivity index (m) and temperature sensitivity index (s) of the alloy under different deformation conditions were analyzed. Based on the dynamic material model (DMM), the thermal processing map was established. Combined with microstructure, the optimal parameters of hot processing were determined. The results show that the flow stress decreases with the increase of deformation temperature and the decrease of strain rate, and as-cast GH2132 alloy is the strain rate and temperature sensitive material. These are beneficial to the formation of equiaxed grains with uniform distribution by increasing the temperature and decreasing the strain rate. Combined with the thermal processing map and deformation microstructure, the preferable thermal deformation parameters of as-cast GH2132 were determined, and the corresponding deformation temperature and strain rate ranges are 1295-1418 K and 3.07-10 s-1, respectively.
Key words: as-cast GH2132 alloy; thermal deformation behavior; hot processing map
