TY - JOUR
T1 - Influence of heat treatment on Inconel 625 superalloy sheet
T2 - carbides, γ'', δ phase precipitation and tensile deformation behavior
AU - Liu, Xudong
AU - Fan, Jiangkun
AU - Zhang, Peizhe
AU - Cao, Kai
AU - Wang, Zixiao
AU - Chen, Fulong
AU - Liu, Degui
AU - Tang, Bin
AU - Kou, Hongchao
AU - Li, Jinshan
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/1/5
Y1 - 2023/1/5
N2 - In this study, commercial Inconel 625 superalloy was subjected to solution and longer-term aged treatment. The effects of the temperature and time of aged treatment on the secondary-phase evolutions, tensile properties, and strengthening mechanism of Inconel 625 superalloy were systematically investigated. The results showed that the evolution of M23C6 carbides mainly included two paths: MC+ γ→M23C6 at 650 °C and MC+ γ→M23C6 + δ at 750 °C. The disk-like γ'' phase with three mutually orthogonal variants dispersedly precipitated within the grains after aged treatment at 650 °C for 200 h. After aged treatment at 750 °C for 100 h, the needle-like δ phase parallelly precipitated around the grain boundaries. As the aged time reached 200 h and 300 h, δ phases precipitated within the grains at the expense of the metastable γ" phase. Both γ'' and δ phases strengthened the alloy during tensile deformation at room temperature (RT). However, the γ'' phase showed a better strengthening effect than the δ phase. Coarsened δ phases would cause severe stress concentration around δ phase/matrix interfaces during the non-uniform deformation stage. With the increase of tensile strain, many microvoids appeared around the δ phases/matrix interfaces, which weakened the strengthening effects of the δ phases.
AB - In this study, commercial Inconel 625 superalloy was subjected to solution and longer-term aged treatment. The effects of the temperature and time of aged treatment on the secondary-phase evolutions, tensile properties, and strengthening mechanism of Inconel 625 superalloy were systematically investigated. The results showed that the evolution of M23C6 carbides mainly included two paths: MC+ γ→M23C6 at 650 °C and MC+ γ→M23C6 + δ at 750 °C. The disk-like γ'' phase with three mutually orthogonal variants dispersedly precipitated within the grains after aged treatment at 650 °C for 200 h. After aged treatment at 750 °C for 100 h, the needle-like δ phase parallelly precipitated around the grain boundaries. As the aged time reached 200 h and 300 h, δ phases precipitated within the grains at the expense of the metastable γ" phase. Both γ'' and δ phases strengthened the alloy during tensile deformation at room temperature (RT). However, the γ'' phase showed a better strengthening effect than the δ phase. Coarsened δ phases would cause severe stress concentration around δ phase/matrix interfaces during the non-uniform deformation stage. With the increase of tensile strain, many microvoids appeared around the δ phases/matrix interfaces, which weakened the strengthening effects of the δ phases.
KW - Carbides
KW - Inconel 625
KW - Strengthening mechanism
KW - γ'' phase
KW - δ phase
UR - http://www.scopus.com/inward/record.url?scp=85139735661&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2022.167522
DO - 10.1016/j.jallcom.2022.167522
M3 - 文章
AN - SCOPUS:85139735661
SN - 0925-8388
VL - 930
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 167522
ER -