Fatigue behaviour of a laser beam welded CoCrFeNiMn-type high entropy alloy

Laser beam welding was used to produce butt joints from the CoCrFeNiMn-type high entropy alloy. The alloy in the initial condition had an fcc single-phase coarse-grained structure. Laser welding resulted in the M7C3-type carbides precipitation in the fcc matrix. The carbide particles precipitation r...

Full description

Saved in:
Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-10, Vol.766, p.138358, Article 138358
Main Authors: Kashaev, Nikolai, Ventzke, Volker, Petrov, Nikita, Horstmann, Manfred, Zherebtsov, Sergey, Shaysultanov, Dmitry, Sanin, Vladimir, Stepanov, Nikita
Format: Article
Language:English
Subjects:
Butt joints
Butt welding
Carbides
Fatigue
Fatigue tests
High entropy alloy
High entropy alloys
Laser beam welding
Lasers
Mechanical properties
Metal fatigue
Microhardness
Microstructure
Seams
Strain localization
Tensile strength
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:Laser beam welding was used to produce butt joints from the CoCrFeNiMn-type high entropy alloy. The alloy in the initial condition had an fcc single-phase coarse-grained structure. Laser welding resulted in the M7C3-type carbides precipitation in the fcc matrix. The carbide particles precipitation resulted in a considerable increase in microhardness from 150 HV 0.5 for the as-sintered condition to 205 HV 0.5 in the fusion zone. Laser beam welding had a negligible effect on both static mechanical properties and fatigue behaviour of the alloy. The endurance limit of either type of specimens (i.e. with and without welding seam) was 200 MPa. Fracture of all specimens with the laser beam welded seams occurred in the base material area during both tensile and fatigue testing. Weak effect of welding on static/fatigue behaviour of the alloy can be attributed to the higher hardness of the fusion zone, resulting in strain localization in the base material area. An increase in load resulted in activation of secondary slip systems and formation of deformation twins in fatigue specimens. [Display omitted] •CoCrFeNiMn-type high entropy alloy was successfully laser beam welded.•Precipitation of carbides resulted in hardening of the fusion zone.•As-sintered and welded alloy had similar static and fatigue properties.•Fatigue fracture mainly occurred in base material area.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2019.138358