Microstructural evolutions and fracture behaviors of a newly developed nickel-base superalloy during creep deformation

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	Microstructural evolutions and fracture behaviors of a newly developed nickel-base superalloy during creep deformation
	Cui, LQ; Yu, JJ; Liu, JL; Sun, XF; Yu, JJ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2018-05-25
卷号	746 页码:335-349
关键词	Single-crystal Superalloy Manganese-silicon Alloy High-temperature Mechanical-properties Stacking-fault Low-stress Fatigue Damage M951g Phase
ISSN号	0925-8388
英文摘要	The creep behaviors of the newly designed nickel-base superalloy M951G have been studied over a stress range of 120-760 MPa and a temperature range of 700 degrees C-1000 degrees C, and the corresponding relationship among testing conditions-microstructural evolutions and fracture characteristics-creep properties has been established. Results show that both the microstructural evolutions and fracture characteristics are dependent on testing temperatures and applied stresses. According to X-ray diffraction (XRD) examinations, creep deformations at 700-800 degrees C and high temperatures low stresses have not any distinctive effect on the acquired patterns. However, deformations at high temperatures relatively higher stresses have significantly highlighted the (220)(gamma &') planes, which may enhance the creep strength and lead to a better plasticity for M951G alloy. Furthermore, precipitate dimensional changes and their effects on creep properties also have been widely discussed. At the same testing temperature, creep life of M951G alloy decreases with applied stress increasing, which has been analyzed in detail. Fracture behaviors of M951G alloy are observed by using optical microscope (OM) and scanning electron microscope (SEM), which change from a mixed type of transgranular and intergranular to pure intergranular cracking with the variation of creep conditions. The values of apparent stress exponents at 700 degrees C and 1000 degrees C are calculated to be about 11.5 and 6.4 respectively, the difference of which is due to the changes of the deformation mechanisms, fracture modes and the degeneration of microstructures. (c) 2018 Published by Elsevier B.V.; The creep behaviors of the newly designed nickel-base superalloy M951G have been studied over a stress range of 120-760 MPa and a temperature range of 700 degrees C-1000 degrees C, and the corresponding relationship among testing conditions-microstructural evolutions and fracture characteristics-creep properties has been established. Results show that both the microstructural evolutions and fracture characteristics are dependent on testing temperatures and applied stresses. According to X-ray diffraction (XRD) examinations, creep deformations at 700-800 degrees C and high temperatures low stresses have not any distinctive effect on the acquired patterns. However, deformations at high temperatures relatively higher stresses have significantly highlighted the (220)(gamma &') planes, which may enhance the creep strength and lead to a better plasticity for M951G alloy. Furthermore, precipitate dimensional changes and their effects on creep properties also have been widely discussed. At the same testing temperature, creep life of M951G alloy decreases with applied stress increasing, which has been analyzed in detail. Fracture behaviors of M951G alloy are observed by using optical microscope (OM) and scanning electron microscope (SEM), which change from a mixed type of transgranular and intergranular to pure intergranular cracking with the variation of creep conditions. The values of apparent stress exponents at 700 degrees C and 1000 degrees C are calculated to be about 11.5 and 6.4 respectively, the difference of which is due to the changes of the deformation mechanisms, fracture modes and the degeneration of microstructures. (c) 2018 Published by Elsevier B.V.
学科主题	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	National Natural Science Foundation of China [50931004, 51571196, 51771191]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79300]
专题	金属研究所_中国科学院金属研究所
通讯作者	Yu, JJ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Cui, LQ,Yu, JJ,Liu, JL,et al. Microstructural evolutions and fracture behaviors of a newly developed nickel-base superalloy during creep deformation[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,746:335-349.
APA	Cui, LQ,Yu, JJ,Liu, JL,Sun, XF,&Yu, JJ .(2018).Microstructural evolutions and fracture behaviors of a newly developed nickel-base superalloy during creep deformation.JOURNAL OF ALLOYS AND COMPOUNDS,746,335-349.
MLA	Cui, LQ,et al."Microstructural evolutions and fracture behaviors of a newly developed nickel-base superalloy during creep deformation".JOURNAL OF ALLOYS AND COMPOUNDS 746(2018):335-349.