(1. 華南理工大學(xué)機械與汽車工程學(xué)院，廣州 510640；
2. 河南牧業(yè)經(jīng)濟學(xué)院能源與智能工程學(xué)院，鄭州 450011)
摘 要: 通過宏-細觀耦合模擬，研究不同溫度和減薄率下鎂合金帶內(nèi)筋筒形件壁部和筋部織構(gòu)的演變規(guī)律，并結(jié)合宏觀和細觀分析對織構(gòu)演變原因進行探究。結(jié)果表明，熱強旋過程中晶粒c軸朝平行于旋壓件徑向偏轉(zhuǎn)。減薄率相同時，壁部晶粒由于較大的徑向壓應(yīng)力作用產(chǎn)生比筋部更大的偏轉(zhuǎn)角度；滑移系累積剪應(yīng)變隨減薄率增加具有與宏觀真實應(yīng)變一致的線性增大特點，這將引起織構(gòu)強度的不斷增加。溫度對織構(gòu)類型影響顯著，旋壓件在較低溫度時保持坯料基面板織構(gòu)特征，隨溫度的增加，晶粒c軸發(fā)生大角度偏轉(zhuǎn)，板織構(gòu)特征減弱；隨著溫度的升高，筋部應(yīng)變量相比壁部具有更大的增幅，這是溫度對筋部織構(gòu)強度影響更為顯著的原因。
關(guān)鍵字: 鎂合金；帶內(nèi)筋筒形件；熱強旋；織構(gòu)演變；宏-細觀耦合模擬
（1. School of Mechanical and Automotive Engineering, South China
University of Technology,Guangzhou 510640, China;
2. School of Energy and Intelligence Engineering,
Henan University of Animal Husbandry and Economy, Zhengzhou 450011, China）
Abstract:By the simulation study on the macro-meso coupled texture evolution, the evolution law of deformation texture at cylindrical wall and inner rib of magnesium alloy cylindrical parts with inner ribs at different spinning temperatures and thinning rates of wall thickness was studied during hot power spinning, and the reasons of texture evolution law were explored combined with macro and meso deformation analysis. The results show that the c-axis of grains will deflect parallel to the radial direction of spun workpiece during hot power spinning, and the deflection angle of the grains at cylindrical wall is larger than that at inner rib under the action of large radial compressive stress. With the increase of thinning rate of wall thickness, the cumulative shear strain of slip systems increases linearly with increasing macro real strain, which will lead to the continuous increasing of texture strength. Temperature has a significant effect on the texture type. The spun workpiece still maintains the texture characteristics of basal plane of blank at lower temperature. With the increase of temperature, the c-axis of grains deflects with a large angle, and the plane texture characteristics weaken continuously. The larger the increasment of the strain at inner rib than that at cylindrical wall as the temperature rising is the reason why the temperature has a more significant effect on the texture strength at inner rib.
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