首页|Dissimilar electron beam welding of the medium-entropy alloy (NiCoCr)(94)Al3Ti3 to 304 stainless steel
Dissimilar electron beam welding of the medium-entropy alloy (NiCoCr)(94)Al3Ti3 to 304 stainless steel
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NSTL
Elsevier
Electron beam welding of the medium-entropy alloy (MEA) (NiCoCr)(94)Al3Ti3 to 304 stainless steel (SS) has been undertaken. Defect-free joints were obtained with coarse columnar grains: the columnar grains on the 304 SS side of the fusion zone (FZ) were finer (94 mu m, length-to-width ratio-2.7) than the grains on the MEA side (204 mu m, 2.9), a difference that probably resulted from a higher cooling rate after welding due to the higher thermal conductivity of the 304 SS compared to the MEA. Mixing of the two materials in the FZ led to lower vol.% (14%) and larger diameter (44 nm) of L1(2) nanoparticles compared to the 23 nm dia. and 37% vol.% in the aged MEA, a result consistent with CALPHAD analysis. The joint showed a good combination of yield strength (323 MPa), ultimate tensile strength (670 MPa), and elongation (24%). Failure occurred by ductile fracture in the FZ.
Electron beam weldingMedium-entropy alloyMicrostructureMechanical propertiesStrengthening mechanismsMECHANICAL-PROPERTIESSTRENGTHDEFORMATIONWELDABILITYDUCTILITYCARBON
NSTL
Elsevier
