Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7921135 | Materials Chemistry and Physics | 2018 | 37 Pages |
Abstract
The nanohardness values and modulus of the prior δ phase in both direct current (DC) and vibration-assisted (VIB) weld metal were higher than those of the base metal. The dislocation density in the δ phase matrix was the highest in the VIB weld metal, followed by the DC weld metal and the base metal. Therefore, the higher nanohardness value in the δ phase, especially for the VIB welding, was attributed to the existence of a higher dislocation density. By contrast, the nanohardness values of the γ phase in both weld metals were not affected by the welding process. The predicted nanohardness value of the composite phase with the rule-of-mixture was consistent with the result of nanoindentation measurements. The deformation induced a V-shaped double twin was revealed by the effect of nanoindentation on the austenite grain of the VIB weld metal.
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Authors
Chun-Hway Hsueh, Min-Jen Liao, Shing-Hoa Wang, Yu-Ting Tsai, Jer-Ren Yang, Rudder Wu, Woei-Shyan Lee,