Phase tranfor mations during rapid
Dissertant
University
University of Technology
Faculty
-
Department
Department of Production Engineering and Metallurgy
University Country
Iraq
Degree
Ph.D.
Degree Date
2004
English Abstract
Rapid solidification has been attracted many investigators to study its effect on material properties.
Laser cladding, is considered to be one of the most important process of rapid solidification that gives desirable metallurgical, mechanical, tribological and chemical properties.
The importance of laser cladding is related to develop clad layers that have chemical compositions differ to the chemical composition of the substrate with minimum controlled dilution, In this study, continuous wave CO, laser with 1.7 and 2 kW were used to deposit clad layers of premixed powders of either Ni-I0 %A1 or Ni-30 % A1 onto Inconel 617 substrate.
Different cladding speeds were used ranging from 1 to 35 mm / s for premixed clad powder of Ni-10 % A1 and 1.65 to 11.2 mm / s for premixed clad powder of Ni-30 % A1 with 5 mm beam diameter.
Two feeding rates were used, 10 and 8.9 gm.
/ min for premixed clad powders of Ni-10 % A1 and Ni-30 % A1 respectively.
The other laser independent variables were selected to be constant.
The results showed that different mechanisms of growth were taken The Se Planar cellular / dendritic and dendritic growth.
volume fraction of growth region was different for each clad layer egion.
Different sizes of porosities and cracks were observed in the clad which the mechanism of porosities and cracks formation was percentages of area dilution were found ranging from 3.7 W§jg3% for premixed clad powder of Ni-10 %A1 and 6.88 to 41.02 % for clad powder of Ni-30 %A1 depending on the used laser padding independent variables.
Furthermore, dilution had vital role on inicrohardness values of clad layers.
Two clad layers have been chosen tobe with optimum properties.
These are clad layers of 3.9 and 3.2 mm / s cladding speeds that corresponding to premixed clad powders of jsji-10 %A1 and Ni-3 0 % A1 respectively.
Main Subjects
Topics
American Psychological Association (APA)
Subhi, Aqil Zahir. (2004). Phase tranfor mations during rapid. (Doctoral dissertations Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-305827
Modern Language Association (MLA)
Subhi, Aqil Zahir. Phase tranfor mations during rapid. (Doctoral dissertations Theses and Dissertations Master). University of Technology. (2004).
https://search.emarefa.net/detail/BIM-305827
American Medical Association (AMA)
Subhi, Aqil Zahir. (2004). Phase tranfor mations during rapid. (Doctoral dissertations Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-305827
Language
English
Data Type
Arab Theses
Record ID
BIM-305827
