Microstructure and mechanical properties of laser surface alloyed coatings prepared on cast Ai-Si

被引：6
|
作者：
Cai, X [1 ]
Yang, X [1 ]
Wang, J [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Dept Mat Sci & Engn, Shanghai 200030, Peoples R China
来源：
SURFACE ENGINEERING | 1999年 / 15卷 / 02期
关键词：
D O I：
10.1179/026708499101516443
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Laser surface alloyed (LSA) layers were obtained on cast Al-Si using a CO2 continuous transverse pow laser beam with maximum power of 10kW: The microstructure of the modified layers was examined using scanning electron microscopy and transmission electron microscopy. Surface alloying with Ni based powder generated a layer composed of gamma-Ni(Cr,Fe), Ni3Al, T(AI,Fe,Si), CrB, and Cr23C6. The matrix phase in the modified layer was gamma-Ni(Cr;Fe), with strengthening phases present. Microhardness and wear resistance tests were also performed: the average microhardness is around 3.1 to 3.6 GPa, three times higher than in the substrate. The antiwear properties of the LSA modified layers were also greatly improved, with relative wear resistance approaching 10 to 12. Finally, the weal mechanisms of LSA modified layers were studied by surface morphology analysis.
引用
收藏
页码：115 / 118
页数：4
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