Abu-Elfotouh, H., Abu-Zeid, O., Elsarnagawy, B., Eleiche, A. (1986). IMPACT TOUGHNESS OP AUSTEMPERED DUCTILE CAST IRON. test, 2(2nd Conference on Applied Mechanical Engineering.), 171-180. doi: 10.21608/amme.1986.57076
H. Abu-Elfotouh; O. A. Abu-Zeid; B. A. Elsarnagawy; A. M. Eleiche. "IMPACT TOUGHNESS OP AUSTEMPERED DUCTILE CAST IRON". test, 2, 2nd Conference on Applied Mechanical Engineering., 1986, 171-180. doi: 10.21608/amme.1986.57076
Abu-Elfotouh, H., Abu-Zeid, O., Elsarnagawy, B., Eleiche, A. (1986). 'IMPACT TOUGHNESS OP AUSTEMPERED DUCTILE CAST IRON', test, 2(2nd Conference on Applied Mechanical Engineering.), pp. 171-180. doi: 10.21608/amme.1986.57076
Abu-Elfotouh, H., Abu-Zeid, O., Elsarnagawy, B., Eleiche, A. IMPACT TOUGHNESS OP AUSTEMPERED DUCTILE CAST IRON. test, 1986; 2(2nd Conference on Applied Mechanical Engineering.): 171-180. doi: 10.21608/amme.1986.57076

IMPACT TOUGHNESS OP AUSTEMPERED DUCTILE CAST IRON

The International Conference on Applied Mechanics and Mechanical Engineering
Article 40, Volume 2, 2nd Conference on Applied Mechanical Engineering., May 1986, Pages 171-180    PDF (2.68 M)
Document Type: Original Article
DOI: 10.21608/amme.1986.57076
Authors
H. Abu-Elfotouh1; O. A. Abu-Zeid2; B. A. Elsarnagawy1; A. M. Eleiche3
1Dept. of Metallurgy,Military Technical College,Cairo,Egypt.
2Dept. of Mech. Design and Prod.,Cairo University,Egypt.
3On leave to Dept. of Engineering,The American University in Cairo, Egypt.
Abstract
The influence of austempering temperature and time, as main austempering control parameters, on the impact toughness and microstructure of a ductile cast iron alloy having a carbon equivalent of 3.88 percent has been investigated. Two transformation temperatures were chosen at 270°C and 400°C such as to obtain microstructure falling within the zones of lower and upper bainite, respectively. Austempering time intervals ranging from 5 minutes to 5 hours were selected for each austempering temperature. Peak values of U-notch Charpy impact toughness of 7.55 and 17.23 Joule/cm² have been attained at time interval of 60 minutes for specimens austempered at 270°C and 400°C, respectively. The changes in mechanical properties with the transformation temperature and time has been observed to be directly related to the phase transformations in the micro-structure. The study of fracture surfaces of impact toughness samples revealed the great complexity of the crack propagation process in austempered ductile iron due to the nature of its structure.
Keywords
Austempered ductile iron; micro-structure; upper bainite; lower bainite; Mechanical Properties
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