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- Title
异质金属熔覆搭接率对 Ni60A 熔覆层显微组织影响.
- Authors
詹 欢; 李 涛; 邓 林 辉; 石 非 凡
- Abstract
The experimental method of using a semiconductor laser to melt Ni60A material on a 45 steel substrate to produce a nickel based alloy coating is adopted to study the internal microstructure. phase composition and microhardness of the cladding layer as a function of the overlap rate. Based on the experimental results. an appropriate overlap rate is selected to meet the performance. requirements. The results show that when the overlap rates are 20%, 30%, 40% and 50%, with the increase of overlap rate, the structure grain at the bottom of the overlap zone in the cladding layer gradually increases, while the structure grain in the middle and upper parts gradually decreases. The main phases of the cladding layer are y-Ni solid solution phase as well as a large amount of hard strengthening phases such as chromium borides and carbides, and when the overlap rate gradually increases from 20% to 30%, the main phase composition gradually increases, but decreases when it increases from 30% to 50%. The microhardness variation pattern of the cladding layer is roughly the same as that of the phase composition. It gradually increases as the overlap rate increases from 20% to 30%, with the lowest microhardness at 20% of overlap rate and the highest microhardness 700 HV at 30% of overlap rate. It then decreases to 665 HV when the overlap rate increases to 50%. According to the performance requirements of the cladding layer, it is required that the microhardness be high. and the structure grain be small and uniform. When only considering the changes in the overlap rate. a comprehensive analysis of the microstructure, phase composition and properties is conducted, and a 30% of overlap rate is selected as the best.
- Publication
Journal of Dalian University of Technology / Dalian Ligong Daxue Xuebao, 2024, Vol 64, Issue 2, p158
- ISSN
1000-8608
- Publication type
Article
- DOI
10.7511/dllgxb202402006