(1. 西北工業(yè)大學(xué) 凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，材料學(xué)院，西安 710072；
2. 西安重型機(jī)械研究院有限責(zé)任公司，西安 710032)
摘 要: 研究確定難變形Inconel 625合金大型厚壁管擠壓加工窗口，是獲得具有良好組織性能擠壓管材的關(guān)鍵。采用響應(yīng)面法建立了一種確定基于溫控?cái)D壓加工窗口的方法。首先，采用基于有限元計(jì)算數(shù)據(jù)的正交回歸方法，建立了分別描述溫升和峰值溫度與關(guān)鍵擠壓參數(shù)之間的響應(yīng)面模型；其次，基于建立的響應(yīng)面模型，分析揭示了關(guān)鍵擠壓參數(shù)對(duì)溫升和溫度峰值的交互作用規(guī)律；最后，通過(guò)繪制擠壓速度和初始溫度空間峰值溫度的等高線圖，建立了不同擠壓比下擠壓加工窗口。基于該擠壓加工窗口，可方便快速地確定合適的關(guān)鍵擠壓參數(shù)組合。
關(guān)鍵字: 型材擠壓；加工窗口；響應(yīng)面法；難變形材料；有限元模擬
（1. State Key Laboratory of Solidification Processing, School of Materials Sciences and Engineering,
Northwestern Polytechnical University, Xi’an 710072, China;
2. China National Heavy Machinery Research Institute Co., Ltd., Xi’an 710032, China）
Abstract:Identifying suitable processing window is necessary but difficult for achieving favorable microstructure and performance in extrusion of large thick-walled pipe with difficult-to-deform Inconel 625 alloy. In this work, a method was established for identifying the extrusion process window considering temperature control using response surface methodology. Firstly, the response surface models, which correlate temperature rise and peak temperature to key extrusion parameters, have been developed by orthogonal regression based on finite element calculated data. Secondly, the coupled effects of the key extrusion parameters on the temperature rise and peak temperature have been disclosed based on the regression models. Lastly, suitable extrusion processing windows, which are described by contour map of peak temperature in the space of extrusion speed and initial billet temperature, have been established for different extrusion ratios. Using the identified process window, a suitable combination of the key extrusion parameters can be determined conveniently and quickly.
Key words: profile extrusion; processing window; response surface methodology; difficult-to-deform materials; finite element simulation
