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同步改善黃銅H68晶界腐蝕行為和力學性能
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-11-02
平均晶粒尺寸為150 μm的工業黃銅H68初始樣品經晶界工程(GBE)處理，其特殊晶界比達到76%、平均晶粒尺寸為30 μm。
同步改善黃銅H68晶界腐蝕行為和力學性能Improvements of intergranular corrosion resistance and?mechanical properties of brass H68
平均晶粒尺寸為150 μm的工業黃銅H68初始樣品經晶界工程(GBE)處理，其特殊晶界比達到76%、平均晶粒尺寸為30 μm。拉伸實驗和銨鹽環境中的腐蝕實驗結果表明：經GBE處理的樣品，不僅其抗拉強度由初始樣品的234 MPa提高到297 MPa，且其晶界腐蝕抗力也得到顯著改善。相比于同樣晶粒尺寸的傳統再結晶狀態樣品，經GBE處理的樣品，雖其抗拉強度降低，但其伸長率卻提高17%；前者在銨鹽環境中沿晶腐蝕嚴重，而后者基本不發生沿晶腐蝕。GBE處理的樣品中存在的大量特殊晶界(主要是 晶界)及其對一般大角度晶界網絡連通性的阻斷是該樣品比初始樣品以及傳統再結晶樣品具有優異晶界腐蝕抗能力的主要原因；特殊晶界雖然具有明顯的界面強化作用，但其強化效果顯然不如一般大角度晶界，其原因可能與特殊晶界具有較高結構有序度有關。
A sample of brass H68 with average grain size of 150 μm was subjected to a GBE processing, a grain boundary character distribution (GBCD) containing special boundary percentage of 76% and an average grain size of 30 μm was obtained. The results of tension and corrosion test indicate that GBE processing can not only obviously improve the ultimate strength from its initial value 234 MPa to 297 MPa, but also drastically increase the intergranular corrosion resistance. Compared with the conventionally recrystallized sample with the same average grain size, the ultimate strength of GBE processed sample drops to some extent, but its ductility increases by 17%. The former exhibits a severe intergranular corrosion cracking, while the later appears to be nearly immune to intergranular corrosion attacking. A great deal of special grain boundaries (especially the ?boundaries ) formed in the GBE processed sample and their effective interruption to the connectivity of general high angle boundary networks accounts for primarily its excellent anti-corrosion behavior were discussed further. Although the special grain boundaries demonstrate their effective hardening, it is obviously weaker than that of general high angle boundaries. This might be attributed to the higher degree of ordering in the special boundaries.
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