摘要
采用１０ｋＷ连续横流ＣＯ２激光器在铸造铝硅合金基底上成功地制备了表面合金化（ＬＳＡ）改性层。通过ＳＥＭ、ＴＥＭ分析、显微硬度测试及耐磨性对比试验，研究了ＬＳＡ改性涂层的显微组织结构、相组成和改性效果。结果表明：合金化涂层由γＮｉ（Ｃｒ，Ｆｅ）基体相、Ｎｉ３Ａｌ相、Ｔ（Ａｌ，Ｆｅ，Ｓｉ）相、Ｃｒ／Ｂ相、Ｃｒ２３Ｃ６相等组成，改性层的平均显微硬度为３１０～３６０ＨＶ０．０１，是基底材料的３倍以上。在不同的测试负荷下，ＬＳＡ改性层的耐磨性均比基底材料有很大的提高，相对耐磨性达１０～１２倍。另外。
A CO\-2 laser with maximium power of 10kW and Ni\|based alloying powder were used to modify the surface properties of cast Al\|Si alloy. It was shown that the coatings were composed of \|Ni(Cr,Fe),Ni\-3Al,CrB,Cr\-\{23\}C\-6 phases. The average microhardness of alloyed coatings,310360HV0.01, was three times high than that of substrate materials. Wear resistance was enhanced greatly, and the relative wear resistance was about 1012 times as big as that of substrate materials. The wear mechanism was studied by surface morphology analysis.
关键词
铸造铝硅合金
激光表面合金化
耐磨性
显微组织
cast Al\|Si alloy,laser surface alloying(LSA),wear resistance,microstructure
