Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第8期    总第113期    2008年8月

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文章编号:1004-0609(2008)08-1407-07
基于Murty准则粗片层TC11合金两相区的热态变形行为
李 鑫1, 2,鲁世强1,王克鲁1,丁林海1,李臻熙3,曹春晓3

(1. 南昌航空大学 材料科学与工程学院,南昌 330063;
2. 南京航空航天大学 材料科学与技术学院,南京 210016;
3. 北京航空材料研究院,北京100095
)

摘 要:  

利用基于Murty准则的加工图技术研究具有粗片层αTC11合金在α+β两相区的热态变形行为。结果表明,基于Murty准则的加工图技术能较好地预测流动失稳区域和反映耗散能量的变形机制和微观组织。通过加工图分析和微观组织观察得到,流动失稳区域为750~880 0.007~10.0 /s880~950 0.2~10.0 /s,流动失稳现象为宏观剪切裂纹、绝热剪切带和原始β晶界孔洞;较佳的加工区域为770~900 0.001~0.005 /s900~950 0.001~0.03 /s,这两个区域分别是α片层球化机制起作用和α片层球化以及α+ββ相变两种机制同时起作用的区域。锻造时可根据锻件的需要来决定α相的含量,在850~950 之间选取最佳变形温度,最佳应变速率为0.001 /s

 

关键词: TC11合金;Murty准则;加工图;热变形;变形机制;流动失稳

Hot deformation behavior of TC11 alloy with thick lamellar microstructure in two phase field based on Murty criterion
LI Xin1, 2, LU Shi-qiang1, WANG Ke-lu1, DING Lin-hai1, LI Zhen-xi3, CAO Chun-xiao3

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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