W元素在新型镍基粉末高温合金中的强化作用

doi:10.11896/cldb.23110103

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Abstract Three experimental high-strength Ni-based PM superalloy ingots with different W contents (4.1wt%, 6.1wt%, and 8.1wt%) were prepared by the process of vacuum induction melting (VIM) + electrode induction melting gas atomization (EIGA) + hot isostatic pressing (HIP) + heat treatment (HT). Combined with the software JMatPro 6.5 and SEM, EBSD, and XRD, the effects of W content on the grain size, annealing twin boundaries, the γ′ phase and the lattice mismatch were analyzed, and the effect of W content on the tensile properties at different temperatures were also calculated and studied. The results indicated that the stacking fault energy of the γ matrix decreased significantly with the increase of W content, resulting in the increase of Σ3 annealing twin boundaries;W transformed the shape of primary γ′ from cuboid to solid state dendrite, but had little impact on the total amount of γ′ phase and secondary and tertiary γ′ phases; the degree of lattice distortion caused by W entering γ phase is greater than that of γ′ phase, resulting in a decrease of the γ′/γ lattice mismatch; W contributed to improving the tensile strength at room temperature and 650—800 ℃, but slightly reduced the ductility. W had better strength above 750 ℃, and it was widely added in the fourth generation PM superalloys. W mainly played the role of solid solution strengthening, γ/γ′ coherent strain strengthening, and grain boundary strengthening. Among them, the contribution of solid solution strengthening was relatively low and W mainly strengthened the γ matrix. The effect of γ matrix solution strengthening and γ/γ′ coherent strain strengthening decreased with the increase of W content, and the grain boundary strengthening effect was the largest when W content was 6.1%. The total contribution of solid solution strengthening, γ/γ′ coherent strain strengthening and grain boundary strengthening was less than 50% of the measured yield strength at room temperature, which indicated that the alloy was mainly strengthened by the γ′ phase.

Key words： powder metallurgy superalloy annealing twin boundaries lattice mismatch stacking fault energy solid solution strengthening coherent strain strengthening grain boundary strengthening precipitation strengthening

Published: 10 August 2024 Online: 2024-08-29

CLC number:

TF803.21

Fund:National Key R & D Program of China (2022YFB3404502).

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	Articles by authors
	JIA Jian
	LUO Junpeng
	ZHANG Haopeng
	YAN Ting
	HOU Qiong
	ZHANG Yiwen

Cite this article:

JIA Jian,LUO Junpeng,ZHANG Haopeng, et al. Strengthening Effect of W Element in New Nickel-based Powder Metallurgy Superalloys[J]. Materials Reports, 2024, 38(15): 23110103-6.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.23110103 OR http://www.mater-rep.com/EN/Y2024/V38/I15/23110103

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