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Ni基合金激光熔覆層組織特征及凝固過程的研究
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TG174.445

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博士點基金資助!(批準號96048708)，?；鹳Y助項目


Microstructure and Solidification Process of the Laser Clad Ni Alloy
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    摘要:

    采用自動送粉方法，在４５鋼表面激光熔覆Ｎｉ基合金粉末，較為系統(tǒng)地研究了掃描速度對激光熔覆層顯微組織特征的影響。實驗結(jié)果表明：Ｎｉ基合金粉末激光熔覆層顯微組織由枝晶及塊狀（或針狀）共晶組織構(gòu)成，共晶碳化物的形態(tài)由化學成分確定；結(jié)合界面不存在白亮帶，為細小亞共晶組織；離結(jié)合界面距離的增加，熔覆層組織逐漸變細，顯微組織表現(xiàn)出明顯不均勻性，提高激光掃描速度，明顯細化了組織郵組織顯微硬度。改善了熔覆層局部組

    Abstract:

    Laser cladding was done on the 45 # steel substrate using an auto feeding powder method. Effect of scanning speed on the microstructure and solidification process of the laser cladd Ni alloy have been systematically studied. Experimental results show that the clad microstructure is composed of primary dendrite and block(or needle) eutectic. The mophology of eutectic carbide is resulted from its chemical composition. Bright ribbon does not exist, and there is finer hypoeutectic microstructure at the interface between overlapping and clad layers. The clad microstructure becomes finer and inhomgeneous with increasing the distance from the interface. The increase of scanning speed results in finer structure, higher micro hardness, and better homogeneity. The solidification process is discussed based on the analyzed model. Some solidification parameters of laser melting bath are also calculated.

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曾大文 夏輝. Ni基合金激光熔覆層組織特征及凝固過程的研究[J].稀有金屬材料與工程,2000,(2):109~113.[Zeng Dawen, Xia Hui, Xie Changsheng. Microstructure and Solidification Process of the Laser Clad Ni Alloy[J]. Rare Metal Materials and Engineering,2000,(2):109~113.]
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  • 最后修改日期:1999-02-09
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