Issue |
Metall. Res. Technol.
Volume 115, Number 4, 2018
|
|
---|---|---|
Article Number | 410 | |
Number of page(s) | 6 | |
DOI | https://doi.org/10.1051/metal/2018012 | |
Published online | 22 August 2018 |
Regular Article
Effects of oxygen content on microstructure and impact toughness of high heat input flux-cored wire weld metals
1
School of Mechanical and Electrical Engineering, Longyan University,
Longyan
364000, PR China
2
The Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University,
Shenyang
110819, PR China
3
The State Key Laboratory of Rolling and Automation, Northeastern University,
Shenyang
110819, PR China
* e-mail: wping@epm.neu.edu.cn
Received:
15
October
2016
Accepted:
16
January
2018
Three weld metals with different oxygen contents were developed. The influence of oxygen contents on the microstructure and impact toughness of weld metal was investigated through high heat input welding tests. The results showed that a large number of fine inclusions were formed and distributed randomly in the weld metal with oxygen content of 500 ppm under the heat input condition of 341 kJ/cm. Substantial cross interlocked acicular ferritic grains were induced to generate in the vicinity of the inclusions, primarily leading to the high impact toughness at low temperature for the weld metal. With the increase of oxygen content, the number of fine inclusions distributed in the weld metal increased and the grain size of intragranular acicular ferrites decreased, which enhanced the impact toughness of the weld metal. Nevertheless, a further increase of oxygen content would contribute to a great diminution of the austenitic grain size. Following that the fraction of grain boundary and the start temperature of transformation increased, which facilitated the abundant formation of pro-eutectoid ferrites and resulted in a deteriorative impact toughness of the weld metal.
Key words: high heat input / weld metal / acicular ferrite / toughness / oxygen content
© EDP Sciences, 2018
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.