大规格ZK60镁合金坯料半连续铸造工艺研究
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摘要
采用半连续铸造工艺制备了500mm的大规格ZK60镁合金坯料。采用多次低压转注移液和静置技术净化镁合金熔体,分析了工艺参数对坯料冶金质量的影响,确定了合理的工艺参数区间,并对镁合金铸锭的主要冶金缺陷的形成机制及组织特征进行了研究。结果表明,铸造速度过大或二次冷却水的流量过大导致铸锭中心附近形成通心裂纹缺陷。大规格ZK60镁合金半连续铸锭的显微组织为α-Mg基体和MgZn2相,MgZn2相在晶界上不连续析出,铸锭的径向组织不均匀,边缘处的晶粒尺寸明显小于中心处的。
ZK60 magnesium alloy ingots with the diameter of 500 mm were fabricated by the semi-continuous casting.The melt was well purified by low pressure transferring the melt and standing technique.The effects of the casting parameters on the metallurgy quality of the ingots were investigated and the reasonable parameter windows were established.The metallurgy defects were analyzed to understand the formation mechanism of the defect.The characteristics of the microstructure was also observed.The results reveal that the casting velocity has the significant effect on the metallurgy quality of the ingot.The through-crack can be formed in the center zone of the ingot in case of using the higher velocity or the higher water flow.The microstructure of the large-scale ZK60 magnesium alloy is composed of equiaxed grain withα-Mg matrix and the second phases MgZn2 which are precipitated in the grain and the grain boundary discontinuously.The grain in the edge of the ingots is much more refined than that of the center of the ingots.
ZK60 magnesium alloy ingots with the diameter of 500 mm were fabricated by the semi-continuous casting.The melt was well purified by low pressure transferring the melt and standing technique.The effects of the casting parameters on the metallurgy quality of the ingots were investigated and the reasonable parameter windows were established.The metallurgy defects were analyzed to understand the formation mechanism of the defect.The characteristics of the microstructure was also observed.The results reveal that the casting velocity has the significant effect on the metallurgy quality of the ingot.The through-crack can be formed in the center zone of the ingot in case of using the higher velocity or the higher water flow.The microstructure of the large-scale ZK60 magnesium alloy is composed of equiaxed grain withα-Mg matrix and the second phases MgZn2 which are precipitated in the grain and the grain boundary discontinuously.The grain in the edge of the ingots is much more refined than that of the center of the ingots.
引文
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[2]袁广银,牛佳林.可降解医用镁合金在骨修复应用中的研究进展[J].金属学报,2017,53(10):1 168-1 180.
[3]张清,陈君,李全安.Mg-Y-Sm系耐热镁合金的研究进展[J].热加工工艺,2017,46(12):19-25.
[4]王贵生,李黎忱,闫志峰,等.热处理对ZK60轧制镁合金组织和力学性能的影响[J].热加工工艺,2017,46(2):215-222.
[5]张保丰,蔡海勇,李庆奎.利用海绵锆制备低成本ZK60A镁合金的研究[J].铸造,2013,62(1):17-21.
[6]王子田.ZK60镁合金热塑性变形与冲击性能研究[D].太原:中北大学,2013.
[7]林金保,任伟杰,王心怡.挤压态ZK60镁合金室温拉-压不对称性研究[J].金属学报,2016,52(3):264-270.
[8]程文杰,陈拂晓,郭俊卿.ZK60镁合金板材成形性能试验[J].塑性工程学报,2012,19(3):79-81.
[9]孙营.ZK60镁合金板材拉伸成形性能的各向异性研究[D].太原:太原理工大学,2016.
[10]吴远志,严红革,朱素琴,等.多向锻造ZK60镁合金组织和性能的均匀性[J].中国有色金属学报,2014,24(2):310-316.
[11]李金柱,农登,郑开宏,等.镁合金半连续铸造技术的研究与展望[J].铸造技术,2013,34(3):334-337.
[12]侯军才.小直径AZ31镁合金半连续铸锭的缺陷分析及防止[J].铸造技术,2015,36(10):2 583-2 585.
[13]蒲治军,张奎,赖林,等.半连续铸造AZ40镁合金组织分析和均匀化工艺[J].特种铸造及有色合金,2015,35(4):337-340.
[14]陶健全.半连续铸造AZ31和AZ63镁合金大铸锭组织和性能均匀性研究[D].重庆:重庆大学,2012.
[15]赵凯阳.半连续镁合金锭铸态组织研究[D].重庆:重庆大学,2010.
[16]黄伯云,李成功,石力开,等.材料工程大典[M].北京:化学工业出版社,2006.
[17]刘斐.热处理对ZK60镁合金显微组织及疲劳断裂行为的影响[D].太原:太原理工大学,2017.
[18]王维青.合金元素对ZK60镁合金第二相的影响[D].重庆:重庆大学,2005.
[19]胡文义,乐启炽,刘轩,等.大规格AZ31镁合金板坯半连续铸造温度场数值模拟[J].材料热处理学报,2015,36(5):211-216.
[20]何宇明,朱斌,胡兵,等.降低连铸板坯内部裂纹改判率公关实践[J].钢铁,2001,36(2):23-25.
[21]李永春.铝及铝合金圆锭铸造裂纹及其生产原因[J].有色金属加工,2004,33(2):16-19.
[22]单长智,王立娟,王德满.实心圆锭的应力分析及防止裂纹的措施[J].轻合金加工技术,1997,25(1):1-4.