An investigation of the lack of separation of scales effect in sub-grid modeling o...
| Full text | |
| Author(s): |
Total Authors: 2
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| Affiliation: | [1] CNPEM ABTLuS, Brazilian Nanotechnol Natl Lab, Met Characterizat & Proc Lab, Campinas, SP - Brazil
[2] Univ Estadual Campinas, UNICAMP, Fac Engn Mecan FEM, Campinas, SP - Brazil
[3] Univ Autonoma Caribe, Programa Ingn Mecan, Grp IMTEF, Barranquilla - Colombia
Total Affiliations: 3
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| Document type: | Journal article |
| Source: | METALS AND MATERIALS INTERNATIONAL; v. 20, n. 2, p. 297-305, MAR 2014. |
| Web of Science Citations: | 2 |
| Abstract | |
This work aims the numerical modeling and characterization of as-welded microstructure of Ni-Cr-Fe alloys with additions of Nb, Mo and Hf as a key to understand their proven resistance to ductility-dip cracking. Part I deals with as-welded structure modeling, using experimental alloying ranges and Calphad methodology. Model calculates kinetic phase transformations and partitioning of elements during weld solidification using a cooling rate of 100 K.s(-1), considering their consequences on solidification mode for each alloy. Calculated structures were compared with experimental observations on as-welded structures, exhibiting good agreement. Numerical calculations estimate an increase by three times of mass fraction of primary carbides precipitation, a substantial reduction of mass fraction of M23C6 precipitates and topologically closed packed phases (TCP), a homogeneously intradendritic distribution, and a slight increase of interdendritic Molybdenum distribution in these alloys. Incidences of metallurgical characteristics of modeled as-welded structures on desirable characteristics of Ni-based alloys resistant to DDC are discussed here. (AU) | |
| FAPESP's process: | 06/05661-1 - Study of intergranular fracture mechanism by ductility reduction in Ni-Cr-Fe alloys |
| Grantee: | Jimy Unfried Silgado |
| Support type: | Scholarships in Brazil - Doctorate |