H62黄铜连续挤压条件下的流动特征研究

黄铜合金连续挤压成形，存在着目前各种合金材连续挤压成形的共性瓶颈问题，即坯料的变形抗力明显增大、温度稳定性差、材料流动协调性差和难于成形等关键理论问题，其中黄铜在连续挤压条件下的流动特征是其中的核心问题。本项目拟以两相H62黄铜为研究对象，采用数值模拟分析，掌握应力应变场和流场特征，探索合金的剪切塑性变形机制；采用理论建模分析，建立温度分布特征的理论表征；采用对连续挤压成形实验，全过程的微观组织观测，阐明金属流动协调特征。进而实现从变形机制和微观机理上，解决如上成形理论问题，掌握黄铜在连续挤压条件下的流动特征机理。该研究成果将为探索复杂合金的连续挤压成形，奠定坚实的理论基础。

Brass alloy exists the general bottleneck problems for many kinds of alloy material during continuous extrusion, which are the deformation resistance of the billet increased obviously, poor temperature stability, short of material flow ability, difficult to form, and other key scientific theory problems. The core problem is the flow characteristic of brass alloy under continuous extrusion. The two phase H62 brass alloy is treated as the research object in this project. The stress and strain field and flow field is researched by numerical simulation and the shear plastic deformation mechanism of alloy is explored. The temperature distribution model is built based on theoretical analysis. The flow coordination characteristics are obtained for the whole deformation process. Realizing to solve the forming theory problems from the deformation mechanism, and the brass alloy flow mechanism under continuous extrusion is mastered. The research results of this project lay the foundation for exploring the deformation mechanism of complex alloy during continuous extrusion.