中国机械工程2012，Vol.23Issue(9)：1117-1121,5.
TC4钛合金锯齿形切屑绝热剪切带的微观组织和显微硬度变化
Investigation on Microstructure and Microhardness of Adiabatic Shear Band of Saw-tooth Chip in Machining TC4 Alloy
摘要
Abstract
Microstructure of ASB of saw-tooth chip produced in different cutting speeds was observed and analyzed by optical microscope and TEM in machining of TC4 alloy.The microhardness of ASB was also measured.Experimental results show that ASB formed at low cutting speed is deformed band,at higher cutting speed,ASB becomes transformed band composed of fine equiaxed grains and martensitic phase that comes from phase transformation β→α″.With the further increase of cutting speed,amorphization that had not been observed before occurence inside ASB.The microhardness of ASB always increases with the increasing of cutting speed whatever the ASB is deformed or transfromed band.According to the law of microstructure evolution and the increase of microhardness of ASB,the microhardness increase can be divided into three stages： strain-hardening,grain refining and martensitic phase transformation hardening,amorphization hardening.关键词
锯齿形切屑/绝热剪切带/钛合金/马氏体相变/透射电子显微分析Key words
saw-tooth chip/adiabatic shear band(ASB)/titanium alloy/martensitic phase transformation/transmission electron microscope(TEM) analysis分类
矿业与冶金引用本文复制引用
王升平..TC4钛合金锯齿形切屑绝热剪切带的微观组织和显微硬度变化[J].中国机械工程,2012,23(9):1117-1121,5.
