铸造工艺参数对半连续铸造A390合金管坯宏微观组织的影响  

Effects of Casting Process Parameters on Macrostructure and Microstructure of A390 Alloy Hollow Billet Produced by DC Casting

作　　者：左克生[1] 张海涛[1] 秦克[1] 崔建忠[1] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2015年第10期1426-1430,共5页Journal of Northeastern University(Natural Science)

基　　金：国家重点基础研究发展计划项目(2012CB723307-03);国家自然科学基金资助项目(51204046);中央高校基本科研业务费专项资金资助项目(N130409003)

摘　　要：采用半连续铸造方法制备了A390合金管坯.研究了铸造速度和铸造温度对A390合金管坯宏微观组织的影响.结果表明:随着铸造速度由90 mm/min提升至120 mm/min、铸造温度由800℃增加至850℃,管坯中初生Si宏观分布趋于均匀,初生Si颗粒的平均尺寸逐渐减小.截面尺寸为164 mm/60 mm的半连续铸造A390合金管坯的最佳铸造工艺参数为:铸造速度110 mm/min、铸造温度850℃,可以获得初生Si宏观分布均匀、初生Si颗粒平均尺寸不超过26μm的管坯,管坯内侧的抗拉强度为264 MPa,延伸率为0.5%.DC casting was used to produce A390 alloy hollow billet.The effects of the casting speed and temperature on the macrostructure and microstructure of A390 alloy hollow billets were studied.The results showed that the distribution of primary Si in the hollow billet became more even and the average size of primary Si particle decreased gradually with the increase of the casting speed from 90mm/min to 120 mm /min and casting temperature from 800 ℃ to 850 ℃, respectively.The optimum casting process parameters for the A390 alloy hollow billets ofφ164 mm /φ60 mm were obtained with the casting speed of 1 10 mm/min and casting temperature of 850 ℃.The primary Si particles uniformly distributed with their average size less than 26 μm obtained under the optimum casting process parameters.The ultimate tensile strength and elongation at the inner wall of the hollow billets were 264 MPa and 0.5%,respectively.

关 键 词：A390 合金 初生 Si 管坯 铸造温度 铸造速度 

分 类 号：TG146.2[一般工业技术—材料科学与工程]