Cr/Mo/W元素对镍基高温合金γ/γ′共格组织热稳定性的影响

Cr/Mo/W元素对镍基高温合金γ/γ′共格组织热稳定性的影响

凡莉花, 李金临, 孙九栋, 吕梦甜, 王清, 董闯

Effect of Cr/Mo/W on the Thermal Stability ofγ/γ′Coherent Microstructure in Ni-Based Superalloys

FAN Lihua, LI Jinlin, SUN Jiudong, LV Mengtian, WANG Qing, DONG Chuang

表1 系列合金的团簇式和成分，900℃、500 h时效后γ′粒子尺寸(r)、γ′体积分数(f)和合金显微硬度(H)，及900℃、50 h时效后γ和γ′的点阵常数(a_γ 、a_γ′)、γ/γ′点阵错配度(δ)

Table 1 Related data of the designed series of alloys, including cluster formula, alloy composition, γ′ particle size (r), γ′ volume fraction (f), microhardness (H) after aging at 900^oC for 500 h, and lattice constant (a_γ, a_γ'), lattice misfit (δ) between γ and γ′ phase after aging at 900^oC for 50 h

Alloy

Cluster formula

Composition

mass fraction, %

a_γ, a_γ'

S1-CM

[Al-(Ni₁₂)]-

(Al₁(Ti, Nb, Ta)_0.5(Cr_1.0Mo_0.5))

Ni_77.23Al_5.92Ta_3.31Ti_0.88Nb_1.70-

Cr_5.70Mo_5.26

329 ± 46

73.9 ± 3.5

356 ± 5

a_γ = 0.3605 ± 0.0002

a_γ' = 0.3596 ± 0.0003

-0.25 ± 0.06

S2-CW

[Al-(Ni₁₂)]-

(Al₁(Ti, Nb, Ta)_0.5(Cr_1.0W_0.5))

Ni_73.68Al_5.65Ta_3.16Ti_0.83Nb_1.62-

Cr_5.44W_9.62

323 ± 52

74.7 ± 3.9

374 ± 7

a_γ = 0.3603 ± 0.0002

a_γ' = 0.3591 ± 0.0002

-0.33 ± 0.05

S3-CMW

[Al-(Ni₁₂)]-

(Al₁(Ti, Nb, Ta)_0.5(Cr_0.7Mo_0.4W_0.4))

Ni_73.35Al_5.62Ta_3.14Ti_0.83Nb_1.61-

Cr_3.79Mo_4.00W_7.66

288 ± 54

76.1 ± 3.7

397 ± 7

a_γ = 0.3623 ± 0.0004

a_γ' = 0.3606 ± 0.0003

-0.47 ± 0.07