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在变形温度250~450℃、应变速率0.005~5 s~(-1)和道次间隔时间15~240 s下对AZ31B镁合金进行了双道次等温压缩试验,研究不同变形工艺条件对AZ31B镁合金道次间软化规律的影响,建立了AZ31B镁合金道次间软化率预测模型。根据轧制残余应变产生的原因提出了多道次轧制过程中残余应变率的计算方法。研究结果表明:随着变形温度和应变速率的提高,材料的静态软化率逐渐增大,道次间间隔时间越长,材料软化程度越大。建立的道次间静态软化率计算模型能够很好地表征AZ31B镁合金道次间软化规律,平均相对误差为12.58%。进一步对残余应变率的精确计算能够为AZ31B镁合金多道次轧制过程中轧制力的求解提供理论支持。
The AZ31B magnesium alloy was subjected to a two-pass isothermal compression test at a deformation temperature of 250-450 ℃, a strain rate of 0.005-5 s -1 and a pass interval of 15-240 s. The effects of different deformation conditions on the growth of AZ31B magnesium Alloy path between the softening law, established AZ31B magnesium alloy between the softening rate prediction model. According to the reason of rolling residual strain, the calculation method of residual strain rate in multi-pass rolling process is put forward. The results show that with the increase of deformation temperature and strain rate, the static softening rate of the material gradually increases, and the longer the interval between passes, the greater the softening degree of the material. The established static softening rate calculation model between the passes can well characterize the law of the softening between AZ31B magnesium alloys, with an average relative error of 12.58%. Further calculation of the residual strain rate can provide theoretical support for solving the rolling force in the multi-pass rolling of AZ31B magnesium alloy.