TY - JOUR
T1 - Laser surface modification of ductile iron
T2 - Part 1 Microstructure
AU - Chen, C. H.
AU - Ju, C. P.
AU - Rigsbee, J. M.
N1 - Funding Information:
The authors gratefully acknowledge the financial support of the Department of Energy Division of Materials Science through the University of Illinois Materials Research Laboratory under contract DOE-AC02-76EROl198. This research was also partially supported by the University of Illinois Materials Processing Consortium. The authors also acknowledge use of the facilities at the Center for Microanalysis of Materials in the Materials Research Laboratory, and the help of Mr J. Culton and Mr T. Casale at the Materials Engineering Research Laboratory laser facilities. The cast iron was supplied by Caterpillar Inc., Peoria, IL, USA.
PY - 1988/2
Y1 - 1988/2
N2 - Laser induced microstructural modification of ductile iron has been studied as a function of processing parameters such as power density and beam-substrate interaction time. The high energy density CO2 laser source changes and refines the microstructure of the near surface layer, leading to enhanced hardness and wear resistance. Two basic types of microstructure are produced by laser processing, depending on the solidification/cooling rate of the melted zone. High solidification/cooling rates produce a mechanically metastable austenitic matrix, and a dendritic microstructure with interdendritic cementite films. Low solidification/cooling rates produce a very hard, lamellar ferrite+cementite microstructure. A mixed microstructure of intermediate hardness is produced at intermediate cooling rates. Detailed optical and electron microscopy studies of these microstructures as a function of laser processing parameters are reported.
AB - Laser induced microstructural modification of ductile iron has been studied as a function of processing parameters such as power density and beam-substrate interaction time. The high energy density CO2 laser source changes and refines the microstructure of the near surface layer, leading to enhanced hardness and wear resistance. Two basic types of microstructure are produced by laser processing, depending on the solidification/cooling rate of the melted zone. High solidification/cooling rates produce a mechanically metastable austenitic matrix, and a dendritic microstructure with interdendritic cementite films. Low solidification/cooling rates produce a very hard, lamellar ferrite+cementite microstructure. A mixed microstructure of intermediate hardness is produced at intermediate cooling rates. Detailed optical and electron microscopy studies of these microstructures as a function of laser processing parameters are reported.
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U2 - 10.1179/mst.1988.4.2.161
DO - 10.1179/mst.1988.4.2.161
M3 - Article
AN - SCOPUS:0023964912
SN - 0267-0836
VL - 4
SP - 161
EP - 166
JO - Materials Science and Technology (United Kingdom)
JF - Materials Science and Technology (United Kingdom)
IS - 2
ER -