Effect of B on microstructure and properties of low thermal expansion superalloy

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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
发表期刊	Materials Science and Technology
ISSN	0267-0836
卷号	29 期号:12 页码:1470-1477
摘要	The 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.
部门归属	[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
关键词	Thermo-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
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71653
专题	中国科学院金属研究所
推荐引用方式 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.