振动对铜钢双金属熔铸复合材料凝固组织的影响  

Influence of Vibration on Solidification Structure of Copper-Steel Bimetal Melt-Cast Composite

作　　者：杨世豪 尹延国[1] 方小亮 李志明 YANG Shi-hao;YIN Yan-guo;FANG Xiao-liang;LI zhi-ming(Institute of Tribology,Hefei University of Technology,Hefei 230009,Anhui,China)

机构地区：[1]合肥工业大学摩擦学研究所,安徽合肥230009

出　　处：《铸造》2024年第1期17-24,共8页Foundry

摘　　要：通过在铜钢双金属熔铸工艺的冷却过程中对铸件施加机械振动,研究在0.2 mm振幅条件下,振动频率对铜合金凝固组织和铜钢双金属结合面的影响。结果表明:在铸件冷却阶段对其施加振幅0.2 mm、频率40 Hz的机械振动能够有效细化铜合金侧凝固组织,布氏硬度和组织均匀性显著提升,铜合金晶粒尺寸减小并由枝晶转化为等轴晶,铅元素偏析和聚集现象得到明显改善,有效消除气孔和显微缩松。铜合金和钢基体之间形成冶金结合,未振动和施加振动后剪切断裂模式均为混合断裂,振动后由于α+δ硬脆相的分布发生改变而使剪切强度有所降低。By applying mechanical vibration to the casting during the cooling process of the copper-steel bimetal meltcast process,the influence of the vibration frequency on the solidification structure of the copper alloy and the joint surface of the copper-steel bimetal under the condition of 0.2 mm amplitude was studied.The results show that applying mechanical vibration with an amplitude of 0.2 mm and a frequency of 40 Hz during the cooling stage of the casting can effectively refine the solidified structure of the copper alloy side,the Brinell hardness and structure uniformity are significantly improved,and the grain size of the copper alloy is reduced and transformed from dendrite to equiaxed crystals,segregation and aggregation of lead elements are significantly improved,and pores and micro-shrinkage are effectively eliminated.A metallurgical bond is formed between the copper alloy and the steel matrix,and the shear fracture modes both without vibration and after vibration are mixed.After vibration,the shear strength decreases due to the change in the distribution ofα+δhard and brittle phases.

关 键 词：铜钢双金属 熔铸 机械振动 显微组织 界面结合 

分 类 号：TG292[金属学及工艺—铸造]