铸轧黄铜薄带组织模拟与性能分析

利用ProCAST软件的CAFE模块,研究了工艺参数对铸轧黄铜薄带凝固组织的影响,并通过自制的双辊铸轧机制备了黄铜薄带,分析了黄铜薄带的组织、硬度与力学性能。结果表明,工艺参数通过影响Kiss(凝固点)高度,来影响柱状晶晶粒尺寸与压下率,Kiss点越高,压下率越大,柱状晶生长空间越大,晶粒尺寸越大。通过改变形核参数可获得较大的压下量与细小的凝固组织,提高板带品质;铸轧黄铜薄带的伸长率可达33%,抗拉强度为430MPa,硬度(HV)为140,退火后黄铜薄带的伸长率为55%,抗拉强度为340MPa,硬度(HV)为75。

Microstructure Simulation and Property Analysis of Brass Strip by Twin-roll Strip Casting

The effects of process parameters on the solidification structure of cast rolled brass strip were investigated by CAFE module of ProCAST finite element software.The microstructure,hardness and mechanical properties of brass strip prepared by twin roll casting based on the self-developed rolling machine were analyzed.The results reveal that the process parameters affect the size and reduction rate of columnar grains by affecting the height of the Kiss point.The higher the Kiss point and the greater the reduction rate is,the larger the columnar grain growth space and the grain size is.By adjusting the nucleation parameters,a larger reduction amount and fine solidification structure can be obtained,which can improve the quality of the strip.The elongation of cast rolled brass strip can reach 33%,the tensile strength is 430 MPa,and the hardness is 140 HV.The elongation,the tensile strength and the hardness of annealed brass strip are 55%,340 MPa and 75 HV,respectively.