Gradient Nanotwinned Structure and Its Formation Mechanism in Inconel 625 Alloy Produced by Surface Mechanical Grinding Treatment

doi:10.1007/s12540-022-01297-3

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	Gradient Nanotwinned Structure and Its Formation Mechanism in Inconel 625 Alloy Produced by Surface Mechanical Grinding Treatment
	Ma, Yuanjun 1,2; Ding, Yutian 1,3; Gao, Yubi 1,3; Chen, Jianjun 1,3; Wang, Xingmao 1,3
刊名	METALS AND MATERIALS INTERNATIONAL
	2022-09-01
关键词	Inconel 625 alloy Surface mechanical grinding treatment Gradient nanotwinned structure Grain refinement
ISSN号	1598-9623
DOI	10.1007/s12540-022-01297-3
英文摘要	Effects of surface mechanical grinding treatment on the structure evolution and grain refinements of gradient structured surface layer on Inconel 625 have been studied. The results showed that a 600 mu m thick gradient nanotwinned (GNT) structure layer could be successfully constructed in the superficial layer of the alloy by adjusting the process parameters. The TEM characterization revealed that a gradient change from nano-grain and nanotwinned to dislocation structure was formed in the alloy structure, and the grain size of the outermost layer of the alloy could be refined to 18 nm, with a thickness of up to 30 mu m and a surface hardness of 7.4 GPa. In addition, with an increase in the layer depth, twinning played a major role in the refinement. Firstly, a high-density twin/matrix lamellar structure was formed in the microstructure at high strain rates during the process of plastic-induced grain refinement, and the original coarse grains were refined. During further deformation, due to the increasing difficulty of work hardening and the reactions between dislocations and twin boundaries, the lamellar structure was sheared and broken into equiaxed nanocrystals. Finally, the nanocrystals were further refined to a smaller size through twinning. During this process, twinning is more likely to occur for a grain size of 71-80 nm. These findings shed light on the basic principle of GNT construction, especially the twinning induced grain refinement mechanism under different grain sizes.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	KOREAN INST METALS MATERIALS
WOS记录号	WOS:000852349900004
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/159823]
专题	省部共建有色金属先进加工与再利用国家重点实验室
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Langongping Rd 287, Lanzhou 730050, Gansu, Peoples R China; 2.Lanzhou Petrochem Univ Vocat Technol, Sch Mech Engn, Lanzhou 730060, Gansu, Peoples R China; 3.Lanzhou Univ Technol, Sch Mat Sci & Engn, Langongping Rd 287, Lanzhou 730050, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Ma, Yuanjun,Ding, Yutian,Gao, Yubi,et al. Gradient Nanotwinned Structure and Its Formation Mechanism in Inconel 625 Alloy Produced by Surface Mechanical Grinding Treatment[J]. METALS AND MATERIALS INTERNATIONAL,2022.
APA	Ma, Yuanjun,Ding, Yutian,Gao, Yubi,Chen, Jianjun,&Wang, Xingmao.(2022).Gradient Nanotwinned Structure and Its Formation Mechanism in Inconel 625 Alloy Produced by Surface Mechanical Grinding Treatment.METALS AND MATERIALS INTERNATIONAL.
MLA	Ma, Yuanjun,et al."Gradient Nanotwinned Structure and Its Formation Mechanism in Inconel 625 Alloy Produced by Surface Mechanical Grinding Treatment".METALS AND MATERIALS INTERNATIONAL (2022).