(上海交通大學(xué) 模具CAD國(guó)家工程研究中心，上海 200030)
摘 要:
在PRASAD提出的二維加工圖的基礎(chǔ)上，建立包含應(yīng)變的三維加工圖，經(jīng)分析得到適合鎂合金ZK60的失穩(wěn)判據(jù)，討論并解決了三維加工圖繪制中的關(guān)鍵技術(shù)。在Gleeble−1500熱模擬機(jī)上對(duì)鎂合金ZK60進(jìn)行了熱壓縮實(shí)驗(yàn)，研究了200~360 ℃和0.01~5 /s條件下的熱變形行為。該加工圖的結(jié)果顯示一個(gè)非失穩(wěn)、功率耗散峰值區(qū)：溫度為300~360 ℃、應(yīng)變速率為0.01~0.1 /s，功率耗散平均值為35%，此區(qū)為適合的加工區(qū)。
關(guān)鍵字: ZK60；三維加工圖；動(dòng)態(tài)材料模型；功率耗散系數(shù)；流變失穩(wěn)
（National Die and Mold CAD Engineering Research Center, Shanghai Jiao Tong University, Shanghai 200030, China）
Abstract:Based on the processing map proposed by PRASAD, the three-dimensional processing maps including strain were built and the favorite instability criterion was studied and the key technologies in plotting the three-dimensional processing maps were discussed. The Gleeble−1500 thermomechanical simulation tests of magnesium alloy ZK60 were conducted. The hot deformation behaviors in the temperature range of 200−360 ℃ and strain rate range of 0.01−5 /s were studied. The three-dimension processing maps show that the most favorite deformation domain is the temperature range of 300−360 ℃ and the strain rate range of 0.01−0.1 /s, with a peak efficiency of power dissipation of about 28%.
Key words: ZK60; 3-D processing map; dynamic material model; power dissipation efficiency; flow instability
