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采用商用连铸连轧AZ31镁合金板材,通过小辊径非对称轧制工艺,研究在150,200,250℃温度条件下多道次非对称轧制对镁合金板材组织、织构和力学性能的影响。结果表明,不同轧制温度下,镁合金板材的晶粒细化机理不同,150℃时以孪晶细化为主,部分晶粒发生动态再结晶,200和250℃时板材晶粒细化机理为动态再结晶。对比分析了对称轧制和非对称轧制板材织构演化规律,随着轧制温度的升高,非对称轧制板材基面织构依次增强,但明显低于对称轧制板材。
The effects of multi-pass asymmetric rolling on the microstructure, texture and mechanical properties of magnesium alloy sheets were studied by using commercial continuous casting and rolling of AZ31 magnesium alloy sheets with small diameter asymmetric rolling process at 150, 200 and 250 ℃. The results show that the grain refinement mechanism of magnesium alloy sheet is different under different rolling temperatures. The twins are mainly refined at 150 ℃ and some grains recrystallize dynamically. The grain refinement mechanism at 200 and 250 ℃ Dynamic recrystallization. The textures of symmetrical and asymmetric rolled plates were compared and analyzed. As the rolling temperature increased, the texture of asymmetric rolled plates increased in turn, which was obviously lower than that of symmetrical rolled plates.