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分析了压痕—压平复合形变工艺特点及作用,定义了相关工艺参数,研制了AZ31镁合金板材压痕—压平复合形变模具装置,并进行了实验研究。分析了坯料温度、压下率等工艺参数对镁合金板材微观组织和力学性能的影响规律。结果表明:坯料温度为275℃时,压下率为29%,模具温度为150℃时,经过压痕—压平复合形变后,镁合金板材的微观组织和力学性能得到明显提高,其平均晶粒尺寸为7.84μm,屈服强度为212 MPa,抗拉强度为298 MPa,伸长率为17.2%,显微硬度为91.99 HV。复合形变后的镁合金性能与平棍轧制工艺相比,晶粒尺寸细化了23%,屈服强度提高了5%,抗拉强度提高了15%,伸长率提高了4%,显微硬度提高了12%。
The characteristics and effects of indentation - flattening composite deformation process were analyzed, the relevant process parameters were defined, and an AZ31 magnesium alloy plate indentation - flattening composite deformation mold was developed and experimentally studied. The influence of process parameters such as billet temperature and reduction ratio on the microstructure and mechanical properties of magnesium alloy sheet was analyzed. The results show that the microstructure and mechanical properties of magnesium alloy sheet are improved obviously when the billet temperature is 275 ℃, the reduction rate is 29% and the mold temperature is 150 ℃. The average grain size The grain size is 7.84 μm, the yield strength is 212 MPa, the tensile strength is 298 MPa, the elongation is 17.2% and the microhardness is 91.99 HV. Magnesium alloy composite deformation performance compared with flat rolling process, the grain size refinement of 23%, yield strength increased by 5%, tensile strength increased by 15%, an increase of 4% elongation, microscopic Hardness increased by 12%.