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Achieving Fine Beta Grain Structure in a Metastable Beta Titanium Alloy Through Multiple Forging-Annealing Cycles

Zafari, Ahmad ; Ding, Yunpeng ; Cui, Jianzhong ; Xia, Kenong

Metallurgical and Materials Transactions, 2016-07, Vol.47 (7), p.3633-3648 [Revista revisada por pares]

New York: Springer US

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Título:
Achieving Fine Beta Grain Structure in a Metastable Beta Titanium Alloy Through Multiple Forging-Annealing Cycles
Autor: Zafari, Ahmad ; Ding, Yunpeng ; Cui, Jianzhong ; Xia, Kenong
Materias: Annealing ; Characterization and Evaluation of Materials ; Chemistry and Materials Science ; Forging ; Grain size ; Grain structure ; Grains ; Materials Science ; Metallic Materials ; Metallurgy ; Microstructure ; Nanotechnology ; Slip bands ; Strain ; Structural Materials ; Surfaces and Interfaces ; Thin Films ; Titanium alloys ; Titanium base alloys
Es parte de: Metallurgical and Materials Transactions, 2016-07, Vol.47 (7), p.3633-3648
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descripción: A coarse-grained (order of 1 mm) Ti-5553 metastable beta alloy was subjected to multiple passes of low-temperature forging and multiple forging plus annealing cycles, respectively. In the forging only processing, strain was concentrated in the shear bands formed and accumulated with each forging pass, resulting in a heterogeneous microstructure and eventual cracking along the shear bands. In contrast, the introduction of a short beta annealing after each forging step led to fine recrystallized grains (50 to 100 µ m) formed in the shear bands, and a uniformly refined beta grain structure after four cycles. This is attributed to the strengthening effect of the fine grains, causing redistribution of most severe strains to the coarse grain region in the subsequent forging, consistent with the simulated results by finite element analysis. The analyses of the microstructures and simulated strain distributions revealed that the critical strain for recrystallization is between 0.2 and 0.5 and the strain to fracture to be ~0.8 to 0.9. The fine-grained (50 to 100 µ m) beta alloy, however, fractured at a much smaller strain of <0.4 during the next forging step, owing to the formation of stress-induced martensitic α ″ which is more prevalent in fine grains than in coarse ones.
Editor: New York: Springer US
Idioma: Inglés

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Achieving Fine Beta Grain Structure in a Metastable Beta Titanium Alloy Through Multiple Forging-Annealing Cycles

Zafari, Ahmad ; Ding, Yunpeng ; Cui, Jianzhong ; Xia, Kenong

New York: Springer US

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