Microstructure heterogeneity and creep damage of DZ125 nickel-based superalloy

IMR OpenIR

	Microstructure heterogeneity and creep damage of DZ125 nickel-based superalloy
其他题名	Microstructure heterogeneity and creep damage of DZ125 nickel-based superalloy
	Sun Haofang 1; Tian Sugui 1; Tian Ning 1; Yu Huichen 2; Meng Xianlin 1
	2014
发表期刊	Progress in Natural Science: Materials International
ISSN	1002-0071
卷号	24 期号:3 页码:266-273
摘要	The creep behavior of the DZ125 superalloy at high temperatures has been investigated based on the creep properties measurement and microstructure observations. The experimental results show that, after full heat treatment, the fine and coarser cuboidal γ′ precipitates distributed in the dendrite arm and inter-dendrite regions, respectively, the boundaries with various configurations located in the inter-dendrite regions. In the primary creep stage, the cuboidal γ′ phase in the alloy transformed into the rafted structure along the direction vertical to the stress axis. The dislocations slipping and climbing over the rafted γ′ phase are attributed the deformation mechanism of the alloy during steady-state creep. The (1/2)?110? dislocations slipping in the γ matrix and ?110? super-dislocations shearing into the γ′ phase are the deformation mechanisms of the alloy in the latter stage of creep. And then the alternate slipping of dislocations results in the initiation and propagation of the micro-cracks along the boundaries until the occurrence of the creep fracture. Since the grain boundaries with various angles relative to the stress axis distribute in the different regions, the initiation and propagation of micro-cracks along the boundaries display the various features.
其他摘要	The creep behavior of the DZ125 superalloy at high temperatures has been investigated based on the creep properties measurement and microstructure observations. The experimental results show that, after full heat treatment, the fine and coarser cuboidal γ' precipitates distributed in the dendrite arm and inter-dendrite regions, respectively, the boundaries with various configurations located in the inter-dendrite regions. In the primary creep stage, the cuboidal γ' phase in the alloy transformed into the rafted structure along the direction vertical to the stress axis. The dislocations slipping and climbing over the rafted γ' phase are attributed the deformation mechanism of the alloy during steady-state creep. The (1/2) dislocations slipping in the γ matrix and〈1 1 0> super-dislocations shearing into the γ' phase are the deformation mechanisms of the alloy in the latter stage of creep. And then the alternate slipping of dislocations results in the initiation and propagation of the micro-cracks along the boundaries until the occurrence of the creep fracture. Since the grain boundaries with various angles relative to the stress axis distribute in the different regions, the initiation and propagation of micro-cracks along the boundaries display the various features.
关键词	DZ125 nickel-based superalloy Microstructure Creep mechanism Materials of engineering and construction. Mechanics of materials TA401-492
收录类别	CSCD
语种	英语
CSCD记录号	CSCD:5197925
引用统计	被引频次：3[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/156974
专题	中国科学院金属研究所
作者单位	1.中国科学院金属研究所 2.Beijing Institute Aeronaut Mat, Beijing 100095, Peoples R China
推荐引用方式 GB/T 7714	Sun Haofang,Tian Sugui,Tian Ning,et al. Microstructure heterogeneity and creep damage of DZ125 nickel-based superalloy[J]. Progress in Natural Science: Materials International,2014,24(3):266-273.
APA	Sun Haofang,Tian Sugui,Tian Ning,Yu Huichen,&Meng Xianlin.(2014).Microstructure heterogeneity and creep damage of DZ125 nickel-based superalloy.Progress in Natural Science: Materials International,24(3),266-273.
MLA	Sun Haofang,et al."Microstructure heterogeneity and creep damage of DZ125 nickel-based superalloy".Progress in Natural Science: Materials International 24.3(2014):266-273.