Cavity nucleation during hot forging of Ti-6Al-2Zr-1Mo-1V alloy with colony alpha microstructure  

作　　者：董显娟 鲁世强 郑海忠 李鑫 欧阳德来 

机构地区：[1]National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University [2]College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第12期2259-2264,共6页中国有色金属学报（英文版）

基　　金：Project(2009ZE56014)supported by the Aeronautical Science Foundation of China;Project(gf200901008)supported by the Open Fund of National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,China

摘　　要：The initiation sites and influencing factors of cavity nucleation were investigated for a Ti-6Al-2Zr-1Mo-1V alloy with lamellar starting structure,using the isothermal hot compression test.All samples were deformed to a true strain of 0.70 in the temperature range of 750-950°C and strain rate range of 0.001-10 s-1.The corresponding microstructures were observed by means of the metallurgical microscopy and scanning electron microscopy(SEM).It was found that all cavities occurred at the bulge regions of the compression specimens.Most of cavities nucleated along prior beta boundaries oriented 45°to the compression axis,while others nucleated at the interfaces of lamellar alpha colonies.Cavity nucleation was inhibited with increasing the volume fraction of beta phase and the volume fraction spheroidized of lamellar alpha phase.The initiation sites and influencing factors of cavity nucleation were investigated for a Ti-6Al-2Zr-1Mo-1V alloy with lamellar starting structure,using the isothermal hot compression test.All samples were deformed to a true strain of 0.70 in the temperature range of 750-950°C and strain rate range of 0.001-10 s-1.The corresponding microstructures were observed by means of the metallurgical microscopy and scanning electron microscopy（SEM）.It was found that all cavities occurred at the bulge regions of the compression specimens.Most of cavities nucleated along prior beta boundaries oriented 45°to the compression axis,while others nucleated at the interfaces of lamellar alpha colonies.Cavity nucleation was inhibited with increasing the volume fraction of beta phase and the volume fraction spheroidized of lamellar alpha phase.

关 键 词：Ti-6Al-2Zr-1Mo-1V alloy cavity nucleation lamellar alpha colony dynamic spheroidization 

分 类 号：TG319[金属学及工艺—金属压力加工]