<strong>Allvac 718Plus</strong>高温合金第二相演变与性能研究进展

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Allvac 718Plus高温合金第二相演变与性能研究进展

唐丽婷, 郭倩颖, 李冲, 丁然, 刘永长

Advances in Secondary Phase Evolution and Performance Enhancement of Allvac 718Plus Superalloy

TANG Liting, GUO Qianying, LI Chong, DING Ran, LIU Yongchang

表1 Allvac 718Plus高温合金主要相的晶体结构及组成^[4,18~22]

Table 1 Crystal structures and compositions of main phases in Allvac 718Plus alloy^[4,18-22]

Phase	Formula	Crystal structure	Lattice constant (a, b, c)
γ	-	fcc (A1)	a = 0.377 nm
γ′	Ni₃(Al, Ti)	fcc (L1₂)	a = 0.379 nm
γ″	Ni₃Nb	bct (D0₂₂)	a = 0.391 nm (c / a = 1.99)
η	Ni₃Nb_0.5(Ti, Al)_0.5	Hexagonal (D0₂₄)	a = 0.512 nm, c = 0.836 nm
δ	Ni₃Nb	Orthogonal (D0_a)	a = 0.514 nm, b = 0.423 nm, c = 0.453 nm
MX	(Nb, Ti)(C, N)	fcc (B1)	a = 0.443-0.444 nm
C14 Laves	(Ni, Cr, Fe)₂(Nb, Mo, Ti)	Hexagonal (D0₂₄)	a = 0.88 nm, c = 0.45 nm
σ	(Fe, Ni)Cr	Tetragonal ( $D_{4 h}^{14}$ )	a = 0.49 nm, c = 0.78 nm