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Transformation of MA Constituents during Tempering and Its Effects on Impact Toughness of Weld Metals for X80 Hot Bends
Joint Authors
Xiao, Fu-ren
Qiao, Gui-ying
Han, Xiu-lin
Chen, Xiao-wei
Wang, Xu
Liao, Bo
Source
Advances in Materials Science and Engineering
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-07-17
Country of Publication
Egypt
No. of Pages
10
Abstract EN
Impact toughness of the weld metal is one of the important factors affecting the quality of hot bends, which is strongly dependent on the microstructure transformation during hot bending and tempering.
In this study, three kinds of weld metals with different Ni contents were selected, and then the effects of tempering temperature on the microstructure impact toughness of weld metals for hot bends were investigated by simulation conducted on a Gleeble-3500 thermal simulator.
The results show that the nonmetallic inclusion particles in weld metals can become the nuclear core of acicular ferrite like in as-welded metal.
So, the overlapping acicular ferrite microstructure is obtained in the weld metal after direct cooling from the reheating temperature.
During tempering, the overlapping acicular ferrite microstructure is degenerated, and martensite/austenite (M/A) constituents in the acicular ferrite microstructure decompose into ferrites and carbides.
The resulting carbide particles mainly distribute along the acicular ferrite grain boundaries.
With the increase of the tempering temperature, the carbide particles coarsen, which decreases the impact toughness of the weld metal of hot bends.
Addition of Ni to weld metals can refine the acicular ferrite and improve the impact toughness.
American Psychological Association (APA)
Qiao, Gui-ying& Han, Xiu-lin& Chen, Xiao-wei& Wang, Xu& Liao, Bo& Xiao, Fu-ren. 2019. Transformation of MA Constituents during Tempering and Its Effects on Impact Toughness of Weld Metals for X80 Hot Bends. Advances in Materials Science and Engineering،Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1120468
Modern Language Association (MLA)
Qiao, Gui-ying…[et al.]. Transformation of MA Constituents during Tempering and Its Effects on Impact Toughness of Weld Metals for X80 Hot Bends. Advances in Materials Science and Engineering No. 2019 (2019), pp.1-10.
https://search.emarefa.net/detail/BIM-1120468
American Medical Association (AMA)
Qiao, Gui-ying& Han, Xiu-lin& Chen, Xiao-wei& Wang, Xu& Liao, Bo& Xiao, Fu-ren. Transformation of MA Constituents during Tempering and Its Effects on Impact Toughness of Weld Metals for X80 Hot Bends. Advances in Materials Science and Engineering. 2019. Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1120468
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1120468