Issue |
Metall. Res. Technol.
Volume 119, Number 5, 2022
|
|
---|---|---|
Article Number | 510 | |
Number of page(s) | 9 | |
DOI | https://doi.org/10.1051/metal/2022070 | |
Published online | 10 August 2022 |
Regular Article
Cause analysis of V-shaped crack pairs on drawn welding wire surface of ER70S-6 steel
1
Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
HBIS Group Technology Research Institute, HBIS Group, Shijiazhuang 050023, China
3
Hebei Key Laboratory of Material Near-Net Forming Technology, Hebei University of Science and Technology, Shijiazhuang, Hebei 050018, China
* e-mail: zhht-87@163.com
Received:
8
February
2022
Accepted:
7
July
2022
Welding wires are widely used as electrodes in various welding processes. To produce welding wires, wire rods are drawn gradually to final diameters at welding wire manufacturers. During the wire drawing process, premature failure happens frequently due to various reasons, and a type of wire drawing failure originated from wire surface V-shaped cracks or so-called chevron-like cracks is often found. In this research, V-shaped cracks on drawn welding wire surfaces of ER70S-6 steel were characterised carefully and its underlying mechanism was discussed thoroughly. It was found that the V-shaped cracks on wire surfaces are often present in pairs with opposite directions. Martensite microstructure was found nearby the V-shaped cracks, and its formation can be attributed to deteriorated local lubrication during wire drawing, which causes the austenitization of the wire surface and the subsequent formation of martensite. The large friction on wire surface induces the development of V-shaped cracks along the drawing direction. Meanwhile, as martensite is difficult to deform, strain localization happens in the ferrite/pearlite matrix, and V-shaped strain localization areas were found around the martensite, leading to the development of V-shaped cracks in the opposite direction of the drawing direction.
Key words: V-shaped crack / wire drawing / martensite / fracture
© EDP Sciences, 2022
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.