(1. 江蘇大學(xué) 材料科學(xué)與工程學(xué)院，鎮(zhèn)江 212013；2. 丹陽精密合金廠，鎮(zhèn)江 212352)
摘 要: 在Gleeble−3500熱模擬實驗機上對Delta工藝Inconel 718合金進行高溫壓縮實驗，研究其高溫壓縮變形的流變應(yīng)力行為。結(jié)果表明：δ相時效態(tài)Inconel 718合金在本實驗條件下具有正的應(yīng)變速率敏感性，流變應(yīng)力隨著應(yīng)變速率的降低和變形溫度的升高而減小，動態(tài)再結(jié)晶是合金重要的軟化機制。δ相時效態(tài)Inconel 718合金的熱變形激活能為497.407 kJ/mol，高溫壓縮峰值流變應(yīng)力與變形溫度和應(yīng)變速率的關(guān)系可用雙曲正弦函數(shù)表示。
關(guān)鍵字: Inconel 718合金；Delta工藝；高溫壓縮；流變應(yīng)力；熱變形激活能
Inconel 718 superalloy under hot compression deformation
（1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 210213, China;
2. Danyang Precision Alloy Factory, Zhenjiang 212352, China）
Abstract:The flow stress behavior of the delta-processed Inconel 718 superalloy was investigated by the hot compression on Gleeble−3500 test machine. The results of the thermal simulation compression tests show that the flow stress is positively sensitive to the strain rate and the deformation temperature. The peak stress decreases with the decreasing strain rate and increasing deformation temperature. The dynamic recrystallization is the main softening mechanism of the hot deformation of the delta-processed Inconel 718 superalloy. The activation energy (Q) of the delta-processed δ phase aged Inconel 718 superalloy is 497.407 kJ/mol. The relationships among the flow stress, the deformation temperature and the strain rate for the delta-processed Inconel 718 can be described by the hyperbolic sine-type function.
Key words: Inconel 718 superalloy; delta process; hot compression; flow stress; hot deformation activation energy
