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采用半连铸法制备了AZ31B镁合金板坯,研究了化学成分、杂质含量及均匀化退火工艺对AZ31B变形镁合金板材组织和性能的影响,通过冲断试验对试验板坯的宏观断口进行了分析。结果表明,所制备AZ31B镁合金板坯中的Mn、Fe元素含量超标导致板坯出现粗大柱状晶以及金属间化合物等缺陷,因此该成分的板坯只适合轧制中厚度的板材。该合金板坯采用阶段均匀化退火制度(380℃×8h+420℃×6h),改一火多道次轧制工艺为多火多道次,可轧制出8mm厚板材,其力学性能达到相应标准要求。
AZ31B magnesium alloy slab was prepared by semi-continuous casting method. The effects of chemical composition, impurity content and homogenization annealing process on the microstructure and properties of AZ31B magnesium alloy sheet were studied. The macroscopic fracture of slab analysis. The results show that the excessive content of Mn and Fe in the prepared AZ31B magnesium alloy slab results in defects such as coarse columnar crystals and intermetallic compounds, and the slab of this component is only suitable for the rolling of medium thickness slabs. The alloy slab adopts the stage homogenization annealing system (380 ° C × 8h + 420 ° C × 6h) to change the multi-pass rolling process into a multi-pass multi-pass rolling process, and the 8mm thick plate can be rolled to achieve the mechanical properties of The corresponding standard requirements.