论文部分内容阅读
应用扫描电镜、金相显微镜等对ZL102合金抛光机扣环的断裂进行了断口观察和显微组织分析。结果表明,扣环试样显微组织是由α-Al相、粗大针状的共晶Si相、块状的初生Si相以及少量的骨架状T1(Al7Fe2Si2)和细针状T2(Al5FeSi)富Fe相组成。合金断口表面有许多位向不同的解理刻面,其中的裂纹以穿晶方式解理断裂且存在舌状花样、解理台阶等脆性断裂特征。过多的脆性富Fe相、铸造疏松、夹杂物等削弱了扣环的晶界结合力,导致合金脆性断裂。
The fracture of ZL102 alloy polisher buckle was observed by scanning electron microscopy and metallographic microscope. The results show that the microstructure of the retaining ring specimen is composed of α-Al phase, coarse needle-shaped eutectic Si phase, massive Si phase and a small amount of skeleton T1 (Al7Fe2Si2) and fine needle-like T2 (Al5FeSi) Fe phase composition. There are many different cleavage facets on the fracture surface of the alloy, of which the cracks are cleaved by transgranular cleavage and have the characteristics of brittle fracture such as tongue pattern and cleavage step. Excessive brittle Fe-rich, loose casting, inclusions and other weaken the binding force of the grain boundary, resulting in brittle fracture alloy.