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本文从HMn52-2-5黄铜的金相组织着手,探讨了HMn52-2-5黄铜的超塑性与金相组织的关系。试验证明:HMn52-2-5黄铜采用热处理方法很难达到超塑性所要求的0.5～5微米的等轴超细晶粒。本文提出了对大晶粒β相黄铜锻坯直接进行超塑变形的试验方法;分析了超塑拉伸后试棒的金相组织,并用刻痕法研究了晶粒间与晶内亚晶界在超塑变形后的晶界变化,从而进一步在理论上阐明大晶粒材料的超塑变形机理,为HMn52-2-5黄铜超塑成形提供了理论依据。
This article starts with the microstructure of HMn52-2-5 brass, and discusses the relationship between the superplasticity and microstructure of HMn52-2-5 brass. Tests show that: HMn52-2-5 brass is difficult to achieve superplasticity required by the heat treatment of 0.5 to 5 microns isometric ultrafine grains. In this paper, the experimental method for direct superplastic deformation of large grain β-phase brass forging is proposed. The microstructure of the test rod after superplastic stretching is analyzed. The intergranular and intragranular subgrains Boundary in superplastic deformation of the grain boundary changes in order to further clarify the theory of super-plastic deformation of large grain materials mechanism for the HMn52-2-5 brass superplastic forming provides a theoretical basis.