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Title: Effect of laser clad repair on the fatigue behaviour of ultra-high strength AISI 4340 steel
Authors: Sun, SD
Liu, Q
Brandt, M
Luzin, V
Cottam, R
Janardhana, M
Clark, GA
Keywords: Fatigue
Stainless steels
Residual stresses
Tensile properties
Issue Date: 12-Jun-2014
Publisher: Elsevier
Citation: Sun, S. D., Liu, Q., Brandt, M., Luzin, V., Cottam, R., Janardhana, M., & Clark, G. (2014). Effect of laser clad repair on the fatigue behaviour of ultra-high strength AISI 4340 steel. Materials Science and Engineering: A, 606(0), 46-57. doi:
Abstract: The fatigue behaviour of an ultra-high strength steel (>1800 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 2.5 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. © 2014, Elsevier B.V.
Gov't Doc #: 7499
ISSN: 0921-5093
Appears in Collections:Journal Articles

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