(1. 南昌航空大學(xué) 材料科學(xué)與工程學(xué)院，南昌 330063；
2. 南京航空航天大學(xué) 材料科學(xué)與技術(shù)學(xué)院，南京 210016；
3. 北京航空材料研究院，北京100095)
摘 要:
利用基于Murty準(zhǔn)則的加工圖技術(shù)研究具有粗片層α的TC11合金在α+β兩相區(qū)的熱態(tài)變形行為。結(jié)果表明，基于Murty準(zhǔn)則的加工圖技術(shù)能較好地預(yù)測(cè)流動(dòng)失穩(wěn)區(qū)域和反映耗散能量的變形機(jī)制和微觀組織。通過(guò)加工圖分析和微觀組織觀察得到，流動(dòng)失穩(wěn)區(qū)域?yàn)?/SPAN>750~
關(guān)鍵字: TC11合金；Murty準(zhǔn)則；加工圖；熱變形；變形機(jī)制；流動(dòng)失穩(wěn)
（1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China;
2. Institute of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
3. Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:The hot deformation behavior of TC11 alloy with thick lamellar α was investigated by the approach of processing map based on Murty criterion. The results show that the approach of processing map based on Murty criterion can predict flow instability zones and exhibit deformation mechanisms and microstructures dissipating energy well. By analyzing the processing map and observing microstructures, the flow instability zones are in the ranges of 750−880 ℃, 0.007−10.0 /s and 880−950 ℃, 0.2−10.0 /s, and the manifestations of flow instability are macro cracking, adiabatic shear bands and prior β boundary cavities. The preferable ranges for hot working are in the ranges of 770−900 ℃, 0.001−0.005 /s and 900−950 ℃, 0.001−0.03 /s. In this two ranges, the globularization of lamellar α operates and globularization of lamellar α along with α+β→β phase transformation operates, respectively. For forging of TC11 alloy, the optimum temperature can be selected between 850 ℃ and 950 ℃ in light of the need of α phase content, and the optimum stain rate is 0.001 /s.
Key words: TC11 alloy; Murty criterion; processing map; hot deformation; deformation mechanism; flow instability
