For the purpose of reducing crack propagation rate and improving its performance, crack arrest of Inconel 625 with prefabricated unilateral crack was performed by high density electropulsing technology. The microstructure at the crack tip was analyzed by means of optical microscope (OM) and transmission electron microscope (TEM). The microhardness, tensile strength and elongation of the sample were measured using the Vickers hardness tester and tensile testing machine. The results show that the microstructure at the crack tip turns into the columnar crystals from the isometric crystal, and the fine crystals area is observed in front of them. The dislocation density in grains decreases, and the dislocation with paralleled configuration move to the grain boundary. The microhardness of the crack tip is slightly increased after electropulsing treatment, and the tensile strength is enhanced by 23.85% with the same elongation as before.
|Number of pages||5|
|Journal||Jinshu Rechuli/Heat Treatment of Metals|
|State||Published - Mar 25 2017|
- Crack arrest
- Inconel 625 alloy
- Mechanical properties