Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1575032 | Materials Science and Engineering: A | 2014 | 12 Pages |
Abstract
The fatigue behaviour of an ultra-high strength steel (>1800Â MPa) was evaluated to assess the potential of using laser cladding as a repair tool for such steels in aeronautical structural applications. AISI 4340 and AerMet 100 steel powder were used to clad over a grind-out region in an AISI 4340 steel substrate using a 2.5Â kW ND:YAG laser. Post-clad heat treatment (PCHT) was also investigated. Results showed very poor tensile properties and significantly reduced fatigue life of the AISI 4340 as-clad with a very high hardness and brittle fracture in the clad and HAZ zone. Residual stress results showed a compressive residual stress in the clad region and tensile residual stress in the HAZ. Changing the alloy of the clad layer to AerMet 100 steel, as well as applying a PCHT process, showed promising results as the fatigue life was improved from that of the grind-out substrate.
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Authors
Shi Da Sun, Qianchu Liu, Milan Brandt, Vladimir Luzin, Ryan Cottam, Madabhushi Janardhana, Graham Clark,