Deakin University
Browse

File(s) under embargo

Effect of boron addition on the microstructure and wear resistance of laser beam directed energy deposited high chromium white irons

journal contribution
posted on 2024-04-15, 04:56 authored by C Zhu, I Fordyce, SD Sun, M Annasamy, Daniel FabijanicDaniel Fabijanic, K Short, A Paradowska, M Leary, M Brandt, M Easton
There is a demand for alloys produced by laser beam directed laser deposition (DED-LB) with better wear resistance than the traditionally manufactured alloys. In DED-LB of high chromium white iron (HCWI), the refined carbides at the micron scale can lead to inferior wear performance than the cast alloy of the same composition. In this study, various concentrations of FeB powder were mixed with HCWI powder and produced by DED-LB. The microstructural evolution and its relationship with the wear resistance in high stress abrasion wear test were studied. The B addition is a C equivalent element in HCWI, which can change the composition from hypoeutectic to hypereutectic. In the hypereutectic alloys, B promotes hard phases in the form of M7(C,B)3 and M3(C,B) (M mainly represents Cr and Fe). With the B additions, the volume loss in high stress wear testing is reduced due to the increase in the fraction of the hard phases and their coarsening. With the predominantly austenitic matrix, the alloy with 1.09 wt % B consisting of near 60 vol% hard phases showed a superior wear performance than the heat-treated cast alloy. This was attributed to the microstructure in the contact. The high fraction of refined hard phases and the relatively ductile austenitic matrix (compared with the martensitic matrix) work synergistically, showing a worn surface of plastic deformation without brittle spalling and pitting.

History

Journal

Wear

Volume

546-547

Article number

205320

Pagination

1-9

Location

Amsterdam, The Netherlands

ISSN

0043-1648

eISSN

1873-2577

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Publisher

Elsevier

Usage metrics

    Research Publications

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC