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Mechanical and
fracture analysis of welded pearlitic rail steels
Aldinton Allie, Heshmat A. Aglan and Mahmood Fateh |
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Vol. 5 (2010), No. 2, 263–276
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Abstract |
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Welding rail steels using gas metal arc welding shows promise for repairing railhead defects. Finite element analysis was performed on the rail before and during the welding process. It was revealed that the sizes of the heat affected zone (HAZ) and fusion zone would be approximately 15 mm and 5 mm respectively. Hardness tests showed that the parent material is harder than both the HAZ and the welded region. The parent steel has ultimate strength, yield strength, and elongation to failure of 1114 MPa, 624 MPa, and 11.1% respectively. These values are higher than those of the welded rail steel. The average for the parent specimen was 70 MPam, while for the welded steel it was 54 MPam. The pearlitic steel displayed ductile fracture features immediately ahead of the crack tip but approaching the end of the fracture surface the failure mechanism became less ductile. The welded rail steel in contrast consists of ductile features throughout the entire fracture surface. |
Keywords
welded rail steels, heat affected zone, welding efficiency,
fracture toughness
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Milestones
Received: 22 January 2009
Revised: 2 July 2009
Accepted: 7 July 2009
Published: 30 August 2010
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Authors |
| Aldinton Allie | |
| Mechanical Engineering
Department Tuskegee University Tuskegee, AL 36088 United States |
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| Heshmat A. Aglan | |
| College of Engineering, Architecture
and Physical Sciences 218 Foster Hall Tuskegee University Tuskegee, AL 36088 United States |
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| Mahmood Fateh | |
| Federal Railroad
Administration 1120 Vermont Avenue NW Mail Stop 20 Washington, DC 20590 United States |
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