Improving the Weldability of Nickel-Based Superalloy by High Frequency Vibration
Keywords:vibratory stress relief, residual stress, welding crack, nickel-based superalloy, high frequency vibration
The objective of this paper is to discuss the weldability of Mar-M-004 nickel-based alloy by simultaneous proceeding vibration. Three kinds of vibration modes were chosen to compare the results, including high frequency vibration, subresonant and without vibration. We used x-ray diffraction (XRD) to quantize the residual stress of each sample, also the microstructure and crystal structure were investigated by using optical microscopes.
The results showed that the grain size will get refined after vibration welding, especially in high frequency vibration. From XRD and microstructure results, by using the high frequency vibration method, there has a significant effect of having lowest residual stress and lowest stress relaxation; furthermore, the formation of cracks was also inhibited and having the shortest crack length.
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