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Effect of Liquid Environments on the Tensile Properties of Ductile Iron
Technical Paper
2004-01-0793
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The open literature suggests that high strength ductile irons (Q&T or ADI with hardnesses over 250 BHN) in contact with liquids, such as water or motor oil, may show a loss of ductility in the standard tensile test. This study determined the effect of water and various automotive fluids (mineral oil, motor oil, gear oil, brake fluid, power steering fluid and diesel fuel) on the tensile properties of various low and high strength grades of ductile iron (D-4512, N&T, Q&T, Grade 1 ADI and MADITM). The low strength grade of ductile iron (D-4512), the low strength grade of MADI™ and the high strength quenched & tempered ductile iron showed no loss of ductility when in contact with water or automotive liquids but the industry standard high strength grade of ductile iron (Grade 1 ADI) showed significant degradation. Further, high strength normalized & tempered ductile iron and MADITM, a new, machinable, high strength grade of ductile iron, showed no loss of ductility in contact with automotive fluids and significantly better performance compared to Grade 1 ADI when in contact with water. Shot blast cleaning, which produces beneficial surface compressive stresses, did not suppress this embrittlement phenomena in Grade 1 ADI. This program did not attempt to determine the mechanism responsible for the environmentally induced degradation observed in this study, however, the “liquid metal embrittlement” theories of chemisorption of embrittling atoms at the crack tip causing a reduction in bond strength or enhanced dislocation generation were supported.
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Citation
Druschitz, A. and tenPas, D., "Effect of Liquid Environments on the Tensile Properties of Ductile Iron," SAE Technical Paper 2004-01-0793, 2004, https://doi.org/10.4271/2004-01-0793.Also In
Advances in Lightweight Automotive Castings and Wrought Aluminum Alloys
Number: SP-1838; Published: 2004-03-08
Number: SP-1838; Published: 2004-03-08
References
- Warrick, R.J. et al “Austempered Ductile Iron Castings for Chassis Applications,” SAE Paper No. 2000-01-1290 Society of Automotive Engineers Warrendale, PA 2000
- Brandenberg, K.R. et al “An ADI Crankshaft Designed for High Performance in TVR's Tuscan Speed Six Sports Car,” SAE Paper No. 2001-01-0408 Society of Automotive Engineers Warrendale, PA 2001
- Okorafor, O.E. Loper, C.R. “Effect of Exposure to Water on the Tensile Properties of Ductile Iron,” AFS Transactions 1979 203 208
- Komatsu, S. et al “Embrittlement Characteristics of Fracture Toughness in Ductile Iron by Contact with Water,” International Journal of Cast Metal Research 1999 11 539 544
- Martinez, R.A. et al “Environmentally Assisted Embrittlement of ADI - Current Understanding,” 2002 World Conference on ADI American Foundry Society 2002 91 96
- Druschitz, A.P. Fitzgerald, D.C. “A Machinable Austempered Cast Iron Article Having Improved Machinability, Fatigue Performance and Resistance to Environmental Cracking and a Method of Making the Same,” 2002
- Stoloff, N.S. Johnston, T.L. “Crack Propagation in a Liquid Metal Environment,” Acta Met. 11 1963 251 256
- Lynch, S.P. “Mechanisms of Stress Corrosion Cracking and Liquid Metal Embrittlement, Particularly in High Strength Aluminum Alloys,” ARL/Materials Report 101 Feb. 1977