研究了ZM6镁合金锭无熔剂的重熔,重点研究了气体精炼时间、熔体过热保温温度和时间对重熔后合金的微观组织与力学性能的影响,并考察了合金的组织遗传性.结果表明,重熔后,Nd元素有较明显的烧损;熔炼工艺参数对合金强度产生影响由大到小依次为:过热保温温度、气体精炼、保温时间,最优化条件分别为760℃、3 min、40 min;影响合金伸长率由大到小依次为:过热保温温度、保温时间、气体精炼时间,最优化条件分别为760℃、60 min、3 min;800℃保温可以弱化合金的遗传性,此温度下的优化保温时间为60 min.
Effects of Remelting without Fusion Agent on Microstructure and Properties of Prefab-ricated Ingots of ZM6 Magnesium Alloy
Microstructure and mechanical properties of prefabricated ingots were analyzed.Effects of the time of gas refining,the temperature and holding time of overheating insulation were analyzed.The results indicate that the Nd content is burned after remelting.The affecting sequence of parameters on strength of the alloy ingot is over-heating holding temperature,degassing time and holding time,of which optimized values are 760℃,3 min and 40 min,and affecting sequence on the elongation are over-heating holding temperature,holding time and degassing time,of which optimized values are 760℃,60 min and 3 min.The heredity of the alloy can be weakened holding at 800℃,and the optimized holding time is 60 min.
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