Effect of dwelling time in VIM furnace on chemical composition and mechanical properties of a Ni–Fe–Cr alloy
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in: Vacuum, Jahrgang 169.2019, Nr. November, 108890, 11.2019.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - Effect of dwelling time in VIM furnace on chemical composition and mechanical properties of a Ni–Fe–Cr alloy
AU - Moshtaghi, Masoud
AU - Safyari, Mahdieh
PY - 2019/11
Y1 - 2019/11
N2 - The mechanical properties and changes in chemical compositions and microstructure of a Ni–Fe–Cr alloy in different dwelling time in a vacuum induction melting (VIM) furnace were studied. The chemical analysis shows that the dissipations of Al, Ti and Si increase with increasing the dwelling time in the VIM furnace. With the decrease in Si content due to increasing the dwelling time in the VIM furnace, the segregation of niobium is reduced, resulting in lower incoherent δ phase in the grain boundaries. This incoherent δ phase promotes intergranular fracture in the specimen with the lowest dwelling time. The dissipations of Al and Ti with increasing the dwelling time in the VIM furnace lead to decrease the hardness, yield and ultimate tensile strengths of the alloy, while the elongation increases owing to the lower number of inclusions and strengthening phase (γ″).
AB - The mechanical properties and changes in chemical compositions and microstructure of a Ni–Fe–Cr alloy in different dwelling time in a vacuum induction melting (VIM) furnace were studied. The chemical analysis shows that the dissipations of Al, Ti and Si increase with increasing the dwelling time in the VIM furnace. With the decrease in Si content due to increasing the dwelling time in the VIM furnace, the segregation of niobium is reduced, resulting in lower incoherent δ phase in the grain boundaries. This incoherent δ phase promotes intergranular fracture in the specimen with the lowest dwelling time. The dissipations of Al and Ti with increasing the dwelling time in the VIM furnace lead to decrease the hardness, yield and ultimate tensile strengths of the alloy, while the elongation increases owing to the lower number of inclusions and strengthening phase (γ″).
U2 - 10.1016/j.vacuum.2019.108890
DO - 10.1016/j.vacuum.2019.108890
M3 - Article
VL - 169.2019
JO - Vacuum
JF - Vacuum
SN - 0042-207X
IS - November
M1 - 108890
ER -
