Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31361
Title: Investigation of laser surface alloying of copper on high nickel austenitic ductile iron
Authors: Zeng, DW
Xie, CS
Yung, KC 
Keywords: Laser surface alloying (LSA)
High nickel austenitic ductile iron
Power density
Liquid phase separation (LPS)
Issue Date: 2002
Publisher: Elsevier
Source: Materials science and engineering. A, Structural materials : properties, microstructure and processing, 2002, v. 333, no. 1-2, p. 223-231 How to cite?
Journal: Materials science and engineering. A, Structural materials : properties, microstructure and processing 
Abstract: Laser surface alloying (LSA) of pure copper on high nickel austenitic ductile iron was carried out using a 2 kW continuous wave (CW) CO2 laser with two processing conditions: laser beam spot size D=5 mm, scanning speed V=2 mm s−1, power density E=1.02×104 W cm−2 (condition 1) and D=2 mm, V=9 mm s−1, 6.37×104 W cm−2 (condition 2). Microstructure in the alloyed zone was found to consist mainly of primary γ-austenite dendrites and an interdendritic eutectic of γ-austenite and M7C3 carbides with copper wetting the dendritic boundaries. Distribution of the copper in the alloyed zone is fairly uniform across the depth of the pool and the concentration of copper in the alloyed zone highly depends on the power density. Copper spheroidal particles can be observed at the interdendritic boundaries under condition 1, indicating that the melt could be near the metastable miscibility gap and liquid phase separation (LPS) takes place due to rapid solidification. After LSA, hardness of the alloyed zone is considerably higher than before, which is attributed to both precipitation hardening and work hardening caused by the thermal stress.
URI: http://hdl.handle.net/10397/31361
ISSN: 0921-5093
EISSN: 1873-4936
DOI: 10.1016/S0921-5093(01)01841-X
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