Cracking resistance of Cr3C2–NiCr and WC–Cr3C2–Ni thermally sprayed coatings under tensile bending stress

The cracking behaviour of Cr3C2–25(Ni20Cr) and WC–20Cr3C2–7Ni thermally sprayed coatings during tensile load in 3-point bending tests was studied by Acoustic Emission (AE) monitoring and microstructure post-analysis. The AE monitoring reveals a superior resistance against cracking in the WC–Cr3C2–Ni...

Full description

Saved in:
Bibliographic Details
Published in:Surface & coatings technology 2015-11, Vol.281, p.169-175
Main Authors: Mayrhofer, Erwin, Janka, Leo, Mayr, Wolfgang Peter, Norpoth, Jonas, Rodriguez Ripoll, Manel, Gröschl, Martin
Format: Article
Language:English
Subjects:
Acoustic emission
Bending test
Cr3C2
Cracking
Cracking (fracturing)
Fracture mechanics
HVOF thermal spray coating
Monitoring
Nickel base alloys
Polished
Residual stress
Sprayed coatings
Superalloys
Tensile stress
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The cracking behaviour of Cr3C2–25(Ni20Cr) and WC–20Cr3C2–7Ni thermally sprayed coatings during tensile load in 3-point bending tests was studied by Acoustic Emission (AE) monitoring and microstructure post-analysis. The AE monitoring reveals a superior resistance against cracking in the WC–Cr3C2–Ni coatings compared to Cr3C2–NiCr. The incorporation of tungsten carbides beneficially affects the residual stress state of the coatings and has an impact on the detailed fracture mode. The results hold for both as-sprayed as well as ground and polished coatings. •Superior resistance against cracking of WC–20Cr3C2–7Ni thermally sprayed coatings compared to Cr3C2–25(Ni20Cr)•Acoustic emission monitoring to determine detailed differences in crack initiation and propagation
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2015.09.002