Publication

Correlation between cladding speed, microstructure and hardness of laser-deposited steel coatings: The role of strengthening mechanism

Hemmati, I., Ocelík, V. & De Hosson, J. T. M., 27-Sep-2018, ICALEO 2014 Congress Proceedings. 7 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

In this study, three wear/corrosion-protective Fe-base alloys with different strengthening mechanisms including AISI 316L (boundary strengthening), Hoganas 3533 (boundary strengthening and carbides) and Carpenter MicroMelt 23 (martensite and carbides) were deposited using laser cladding with powder injection at speeds of 1, 10 a nd 100 m m/s. Microstructure of the coatings and the type and quantity of their constituent phases were characterized using Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy and Electron Backscatter Diffraction. Hardness of the coatings was measured using Vickers indentation. Microstructural characteristic size, i.e. dendrite arm spacing or cell width of the coatings were measured on SEM images and the cooling rates during solidification were estimated using an analytical model. At higher cooling rates, the characteristic size decreased and the interdendritic phases became refined for all coatings. Nonetheless, hardness of MicroMelt 23 coatings remained unchanged and hardness of AISI 316L and Hoganas 3533 only slightly increased (10-20 percent). The role of cooling rates on the characteristic size, phase constitution, martensitic transformation and the interplay between various strengthening mechanisms in producing the overall hardness of the deposits are discussed.
Original languageEnglish
Title of host publicationICALEO 2014 Congress Proceedings
Number of pages7
Publication statusPublished - 27-Sep-2018
Event33st International Congress on Applications of Lasers and Electro-Optics, ICALEO 2014 - Sheraton San Diego, United States
Duration: 19-Oct-201423-Oct-2014

Conference

Conference33st International Congress on Applications of Lasers and Electro-Optics, ICALEO 2014
CountryUnited States
CitySheraton San Diego
Period19/10/201423/10/2014

Event

33st International Congress on Applications of Lasers and Electro-Optics, ICALEO 2014

19/10/201423/10/2014

Sheraton San Diego, United States

Event: Conference

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