TC18鈦合金變形本構(gòu)關(guān)系及其熱軋過程有限元仿真的應(yīng)用Constitutive relationship and its application in finite element simulation of hot rolling of TC18 titanium alloy

基于熱模擬試驗(yàn)，構(gòu)建TC18合金的Arrhenius型材料本構(gòu)關(guān)系，并將其應(yīng)用于TC18板坯多道次軋制工藝的有限元仿真，獲得各道次軋制過程中的軋件溫度場(chǎng)、等效應(yīng)力-應(yīng)變場(chǎng)、損傷場(chǎng)等分布情況以及載荷-軋制時(shí)間狀態(tài)，進(jìn)而為軋件尺寸預(yù)測(cè)以及軋機(jī)規(guī)格的選取提供指導(dǎo)。軋件每道次仿真所得尺寸與具體試驗(yàn)所得尺寸比較可知，寬展誤差不超過0.7%，長(zhǎng)度誤差不超過4%。經(jīng)四道次熱軋?jiān)囼?yàn)后，在軋件邊緣1 mm區(qū)域出現(xiàn)了裂紋，與仿真所得損傷場(chǎng)分布一致。上述驗(yàn)證表明仿真結(jié)果能夠與熱軋?jiān)囼?yàn)較好吻合。

Based on thermal simulation a Arrhenius type constitutive relationship of TC18 titanium alloy was applied to the finite element simulation of multi-lane hot rolling. The field of temperature, stress-strain and damage and the load-time status at every lane were investigated to predict the rolling size and the specification of rolling mill. The error in spreading width and rolling length between simulating and experimental results are less than 0.7% and 4% at each lane, respectively. Crack occurs at 1 mm edge of the workpiece after four-lane hot rolling experiment, which is in accordance with the damage field obtained from simulation. The above verification shows that the simulation are coincident with the experimental results.

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