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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 4    December 1999

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Mechanism of pool separation and stratification in laser remelting and cladding
Zeng Dawen(曾大文); Xie Changsheng(谢长生); Sheng Yaming(盛亚明)

College of Materials Science and Engineering; Huazhong University of Science and Technology; Wuhan 430074; P. R - China

Abstract:The laser remelting with a two-layer material system (upper material was Al-30 % Ti-20 % Ni alloy,substrate was commercial aluminum alloy) and the laser cladding of a commercial 45 steel with copper Powder (including 25%SiC) were carried out using a 2kW continuous CO2 laser. For the case of laser remelting, a upper Pool in the alloying layer and a lower Pool in the substrate separated by the unmelted Al-Ti-Ni alloy were observed. For laser cladding, a stratified Pool was observed, whose top layer was Cu alloy liquid and bottom was Fe alloy liquid. The mechanism of laser Pool separation and stratification is illustrated by numerical calculation of heat transter process of the two-layer system, combining with material physical properties (especially mixed enthalpy). A classification criterion for laser Pool with the two-layer material system has been presented and four types of the laser Pool are divided into unique Pool, separated Pool, mixed Pool and stratified pool,which provides a theoretical basis for obtaining a excellent surface coating。 eoretical basis for obtaining a excellent surface coating. 

 

Key words:  laser cladding; laser melting; Pool separation; pool stratification; mechanism

ISSN 1672-7029
CN 43-1423/U

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