Abstract
In order to clarify the strengthening mechanism of an electron-beam welded (EBW) Ni-Co based superalloy, the local deformation behavior in different regions across the weld joint was investigated by the in-situ micro-tensile test in the scanning electron microscope and analyzed by the micro digital image correlation (μDIC). The microstructures across the weld joint were systematically investigated on multiscale levels. The micro-hardness profiles were also determined across the weld joint. Significant changes in the grain size, γ’ phase, MC carbides and dislocation configurations were observed within 2.0 mm from the weld line as a result of the steep temperature gradient and the resultant Marangoni flow occurring during EBW process. Furthermore, the micro-hardness profiles and microstructure-dependent mechanical properties were influenced by the variation of grain size, γ’ particle size and the dislocation density in the weld joint. The cracks preferred to initiate and propagate on the blocky MC carbides, rather than the ultrafine MC carbides and the liquefaction cracks. This study proposes a method for high throughput measurement of microstructure-dependent mechanical properties, and shows a certain guiding significance for optimization of microstructure and improvement of mechanical properties of electron-beam welded Ni-Co based superalloys.
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