Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2016-11-01

Journal: INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY

Included Journals: Scopus、EI、SCIE

Volume: 87

Issue: 5-8

Page Number: 1465-1474

ISSN: 0268-3768

Key Words: Crack arrest; Fusion zone size; Joule heating; Remanufacturing

Abstract: Specimens of UNS S 31600 stainless steel with precast crack were treated under different discharge parameters. An elliptic hole formed ahead of the crack tip and the thermal compressive stress caused during electropulsing treatment cause the crack arresting. The factors affecting the curvature radius of the crack tip were studied. The crack arrest effect was examined by tensile test and fatigue test. Scanning electron microscopy (SEM), electro backscatter diffraction (EBSD), and transmission electron microscope (TEM) were employed to examine the changes of specimen before and after the treatment. The local recrystallization occurred around the crack tip. The experimental results indicate that the curvature radius of the crack tip is proportional to discharge parameter and crack length. The relationship between discharge parameter and the effectiveness of crack arrest can be obtained.