Study on the ductility-dip cracking and its formation mechanism of additive manufactured NiCrFe-7A alloy: Effect of the carbon content

[Display omitted] •The effect of carbon content on the DDC susceptibility was investigated.•High carbon content in a certain range decreased the DDC susceptibility.•Numerous carbides, recrystallization and twins reduced the DDC susceptibility. The effect of carbon content on the ductility-dip cracki...

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Bibliographic Details
Published in:Materials letters 2022-04, Vol.313, p.131761, Article 131761
Main Authors: Zheng, Jialei, Chen, Shuangjian, Jiang, Li, Li, Zhijun
Format: Article
Language:English
Subjects:
Additive manufacturing
Alloying additive
Alloys
Carbides
Carbon
Carbon content
Crack propagation
Ductility
Ductility-dip cracking
Element segregation
Fracture testing
Grain boundaries
Materials science
Microstructure
NiCrFe-7A alloy
Recrystallization
Strain analysis
Thermal simulation
Thermal simulators
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Summary:[Display omitted] •The effect of carbon content on the DDC susceptibility was investigated.•High carbon content in a certain range decreased the DDC susceptibility.•Numerous carbides, recrystallization and twins reduced the DDC susceptibility. The effect of carbon content on the ductility-dip cracking susceptibility of the additive manufactured NiCrFe-7A alloys was investigated. The temperature-strain curves were measured by using strain-to-fracture test via Gleeble-3500 thermal simulator. Results show that the minimum threshold strains of NiCrFe-7A alloys with low carbon and high carbon are 3.61% and 4.72%, respectively. Higher carbon additions promoted more carbides to precipitate at grain boundaries, then improved the resistance to ductility-dip cracking. Moreover, a higher proportion of twins and recrystallization occurred in the NiCrFe-7A alloy with high carbon was beneficial to hinder ductility-dip cracking propagation.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2022.131761