(中南大學(xué) 材料科學(xué)與工程學(xué)院， 長沙 410083)
摘 要: 通過采用最小二乘法和C語言編程擬合熱粘塑性本構(gòu)方程中的待定參數(shù)， 并在此基礎(chǔ)上對絕熱剪切帶內(nèi)溫升進行了估算。將估算結(jié)果與有限元模擬結(jié)果進行比較， 兩者吻合較好。 絕熱溫升的估算結(jié)果表明： 在絕熱剪切帶內(nèi)， 溫度達到了TB2鈦合金的再結(jié)晶溫度， 但低于其相轉(zhuǎn)變溫度， 這與合金發(fā)生剪切變形后的微觀組織特點相一致。
關(guān)鍵字: 絕熱剪切； 熱粘塑性本構(gòu)關(guān)系； TB2合金； 絕熱溫升；
有限元
（School of Materials Science and Engineering,
Central South University， Changsha 410083， China）
Abstract: The specific coefficients of thermal viscoplastic constitutive equation for TB2 were obtained by use of the least square method and C coded programs.The method of estimate adiabatic temperature proposed was used to estimate the temperature rising in adiabatic shear band(ASB).The estimate value is in agreement with the results obtained by FEM simulation. The estimation result of adiabatic temperatures rising indicates that the temperature in ASB is between the recrystallization temperature and phase transition point， and the result is also in agreement with the characteristic of the microstructure in ASB.
Key words: adiabatic shearing; thermal viscoplastic constitutive relation; TB2 alloy; adiabatic temperatures rising; FEM
