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Effect of B on microstructure and properties of low thermal expansion superalloy
L. X. Yu; Y. R. Sun; W. R. Sun; W. H. Zhang; F. Liu; X. Xin; F. Qi; D. Jia; X. F. Sun; S. R. Guo; Z. Q. Hu
2013
Source PublicationMaterials Science and Technology
ISSN0267-0836
Volume29Issue:12Pages:1470-1477
AbstractThe effect of B on microstructure and various properties including coefficient of thermal expansion (CTE), HV hardness, and both smooth and notch stress rupture properties of modified Thermo-Span alloy was studied. The results show that B hardly dissolves in matrix. Increasing B content constrains the formation of Laves phase and grain boundary (GB) precipitation of Laves and G phases, but promotes the formation of M(Co, Fe)NbB boride. In low B doped alloy, its intrinsic high susceptibility to intergranular cracks leads to reduced rupture life and notch sensitivity. Increasing B improves grain boundary cohesion, tying up vacancies and reducing GB diffusion, which constrains the nucleation and propagation of intergranular microcracks, prolongs the rupture life and eliminates the notch sensitivity in the new alloy. Compared with conventional Thermo-Span alloy, the B doped modified alloy shows lower CTE and improved notch sensitivity.
description.department[yu, l. x. ; sun, w. r. ; zhang, w. h. ; liu, f. ; xin, x. ; qi, f. ; jia, d. ; sun, x. f. ; guo, s. r. ; hu, z. q.] chinese acad sci, inst met res, shenyang 110016, peoples r china. [sun, y. r.] shenyang univ technol, shenyang 110178, peoples r china. ; sun, wr (reprint author), chinese acad sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china. ; lxyu@imr.ac.cn ; wrsun@imr.ac.cn
KeywordThermo-span Coefficient Of Thermal Expansion Boron Notch Sensitivity Grain Boundary Grain-boundary Segregation Nickel-based Superalloy Boron Growth Alloys Creep
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/71653
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
L. X. Yu,Y. R. Sun,W. R. Sun,et al. Effect of B on microstructure and properties of low thermal expansion superalloy[J]. Materials Science and Technology,2013,29(12):1470-1477.
APA L. X. Yu.,Y. R. Sun.,W. R. Sun.,W. H. Zhang.,F. Liu.,...&Z. Q. Hu.(2013).Effect of B on microstructure and properties of low thermal expansion superalloy.Materials Science and Technology,29(12),1470-1477.
MLA L. X. Yu,et al."Effect of B on microstructure and properties of low thermal expansion superalloy".Materials Science and Technology 29.12(2013):1470-1477.
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