1. .
EFFECT OF CARBON NODULES ON CONTACT ANGLE OF AUSTEMPERED DUCTILE IRON (ADI)
Sonu Praneeth Gandam, Sourav Das, Dr. Pradeep Rohatgi Department of Material Science and Engineering., UW-Milwaukee.
Introduction
The Austenitic Matrix of Acicular Ferrite known as Ausferrite which makes up the microstructure of ADI.
Austempered Ductile Iron [ADI] provides a range of high strength irons with higher ductility and toughness.
Properties:
Tensile strength: twice that of ductile iron
Wear resistance: superior to steel, ideal for
high abrasion applications
Weight: 10% lighter than steel
Cost: easier to machine than steel, reduces machining allowances
Results:
In this work the effect of carbon nodule count and carbon nodule size on contact angle with three grades of Austempered Ductile Iron, ADI , have been studied.
ADI-900:
minimum carbon nodule count per area,
minimum carbon nodule area
ADI-1600:
maximum carbon nodule count per area,
maximum carbon nodule area
ADI-900 show maximum water contact angle since it has minimum carbon nodule count and area.
Surface energy determines the contact angle.
ADI 900 has higher surface energy as it has low amounts of carbon nodules.
ADI 900, 600 grit size show maximum contact angle
Conclusions
A relationship exists between the carbon nodules count and the grade of ADI
More the carbon nodules area and count more is the wettability of the Austempered Ductile Iron.
Roughness effects the contact angle, maximum observed at 600 grit.
Scope for Future Work:
Design of microstructure showing hydrophobic properties.
Investigating the corrosion behavior and correlating it with carbon nodule count and microstructure
Figure 1.
Heat Tinted Microstructures of: (a) ADI-900
(b) ADI-1200
(c) ADI-1600
(a)
(b)
(c)
Etched Microstructures of: (a) ADI-900
(b) ADI-1200
(c) ADI-1600
Methods
(a)
(c)
(b)
Literature cited
D. Shi*, D. Li, G. Gao and L. Wang “Relation between Surface Tension and Graphite Shape in Cast Iron” Materials Transactions, Vol. 49, No. 9 (2008) pp to 2165
M. Kaczorowski, A. Krzyńska, “Mechanical properties and structure of austempered ductile iron(ADI)” Archives of Foundry Engineering, Volume 7 Issue 1/2007, 161–166.
Acknowledgments
We acknowledge gratefully the support of the NSF Fundamental Project and NSF I/UCRC for a water equipment and policy grant for this work.
Samples by:
A. Sinlah, D. Handayani, R. C. Voigt, K. Hayrynen, R. M'Saoubi & C. Saldana “Effects of microstructure and strength on wear performance in rough milling of austempered ductile iron” International Journal of Cast Metals Research
Acknowledgments
This Project was funded by
NSF
Applied process