Effect of β grain growth on variant selection and texture memory effect during α→β→α phase transformation in Ti–6 Al–4 V

Obasi, Gideon; Birosca, S.; Fonseca, João Quinta da; Preuss, Michael

doi:10.1016/j.actamat.2011.10.038

Cited by 152 publications

(41 citation statements)

References 22 publications

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“…The texture of both the steels depended on the fraction of the austenite phase present in them during the intercritical annealing. During the α → γ → α transformation, a texture with a strong {111} component develops by intercritical annealing with the transformation of a certain amount of the γ phase [33][34][35]. Therefore, in the case of the alloy B steel specimens, γ-fibers, which become parallel to the ND during the α→ γ → α transformation because of the incomplete normalization, were not formed.…”

Section: Discussionmentioning

confidence: 99%

Influence of Heat Treatment on the Workability of Modified 9Cr-2W Steel with Higher B Content

Heo

Kim

et al. 2019

Metals

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In this study, the effect of heat treatment on the fracture behavior of alloy B steel with boron (B) contents as high as 130 ppm was investigated. The Alloy B are derived from Gr.92 steel with outstanding creep characteristics. The amounts of minor alloying elements such as B, N, Nb, Ta, and C were optimized to achieve better mechanical properties at high temperatures. Hence, workability of the alloy B and Gr.92 were compared. An increase in the B content affected the phase transformation temperature and texture of the steel. The development of the {111}<uvw> components in γ-fibers depended on the austenite fraction of the steel after the phase transformation. An increase in the B content of the steel increased its α-to-γ phase transformation temperature, thus preventing the occurrence of sufficient transformation under the normalizing condition. Cracks occurred at the point of the elastic-to-plastic deformation transition in the normal direction during the rolling process, thereby resulting in failure. Therefore, it is necessary to avoid intermediate heat treatment conditions, in which γ-fibers do not fully develop, i.e., to avoid an imperfect normalization.

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Section: Discussionmentioning

confidence: 99%

Influence of Heat Treatment on the Workability of Modified 9Cr-2W Steel with Higher B Content

Heo

Kim

et al. 2019

Metals

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“…It is believed that the texture changes based on the fraction of austenite phase during intercritical annealing of the two steel types. The texture with a strong {111} component develops by intercritical annealing with a certain amount of γ phase transformed during the α → γ → α transformation [29][30][31]. Therefore, the Alloy B steels with a high phase-transformation temperature did not develop γ-fibers which are components that become parallel to the ND direction as a result of incomplete normalization during the α→ γ → α transformation.…”

Section: Discussionmentioning

confidence: 99%

Influence of Heat Treatment on the Workability of Modified 9Cr-2W Steel with Higher B Content

Heo¹,

Kim²,

Kim³

et al. 2019

Preprint

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In this study, the effect of heat treatment was investigated to influence the occurrence of fracture during manufacturing process of Alloy B steel with boron contents as high as 130 ppm. As the content of boron increases, it affects the phase transformation temperature and texture. The development of {111} components in the γ-fiber is affected depending on the austenite fraction after phase transformation. The Alloy B steel indicated that the increase in the boron content increased the α to γ phase transformation temperature such that sufficient transformation did not occur in the normalizing condition. The cracks occurred at the point of the transition from elastic to plastic deformation in the ND direction during the rolling process, thereby resulting in failure.Therefore, it is necessary to avoid the intermediate heat treatment condition in which γ-fiber does not fully develop, i.e., an imperfect normalization. IntroductionNuclear power generation plays a key role in the Korea energy with low costs of raw materials and excellent base load capacity, however its enlargement is limited due to problem of spent nuclear fuel after operation. To solve these problems, it is necessary to develop an innovative nuclear power plant which can contribute to sustainable development, environmental protection and preparation for rapidly increasing energy consumption [1,2].Recently, research has carried out to develop sodium cooled fast reactor (SFR) because it has many advantages in terms of economic efficiency, stability, nuclear non-proliferation and reducing the emission of spent nuclear fuel. It is designed to operate at temperature much higher than those in light water reactors and to improve thermal efficiency [3][4][5][6][7]. Nuclear fuel cladding tube which transfers efficient the fission energy and confines nuclear fuel rod and fissile material is a main component. Hence, the development of fuel cladding tube is essential as it is the most important component directly related to the safety of nuclear reactor.Ferritic-martensitic (FM) steels have been considered as fuel cladding and duct materials for a SFR owing to their high thermal conductivities, low expansion coefficients and superior irradiation swelling compared to austenitic steel [8][9][10]. However, the creep rupture strength of FM steels abruptly decreases during long term creep exposure at high temperature [11]. An advanced FM steel alloy was developed on the basis of Gr.92 steel. Minor alloying elements such as B, N, Nb, Ta, and C Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 16

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“…Compared with the β phase, the microstructure evolution of α-phase plays a more crucial role in the process of thermomechanical treatment. After hot deformation and heat treatment, α phase precipitates in the β matrix according to Burgers orientation and grow in a certain direction [25], as shown in Figure 4b,d,f,h. Due to the introduction of a large number of uniform distributed crystal defects, the distribution of α phase in the β matrix is staggered in different directions.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

Quantitative Relationships between Mechanical Properties and Microstructure of Ti17 Alloy after Thermomechanical Treatment

Yan

Zhao

Liu

et al. 2020

Metals

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In this paper, the relationships between the thermomechanical treatments (TMT), the microstructural evolution the mechanical properties of Ti17 alloy were investigated. The results indicate the coarsening behavior of lamellar α was sensitive to the aging temperature during the process of TMT. The thickness of lamellar α changed from 0.19 to 0.38 μm with an increase in the aging temperature. Moreover, both tensile properties and impact toughness vary with the thickness of lamellar α. The tensile strength increases with the increase of the thickness of lamellar α the plasticity and impact toughness the opposite trend. The quantitative investigations found that there is a linear relationship between the tensile properties and the thickness of lamellar α the tensile properties could be adjusted in the range of 1191~1062 MPa and 1163~1039 MPa to obtain ultimate tensile strength and yield strength as well as 11~16% elongation and 23~33% reduction of area by varying the thickness of lamellar α. Meanwhile, the impact toughness could be adjusted in the range of 46 ~53 J/cm2. The high correlation coefficients imply that the linear equation is reliable to describe the relationships between the mechanical properties and the thickness of lamellar α for Ti17 alloy.

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Effect of β grain growth on variant selection and texture memory effect during α→β→α phase transformation in Ti–6 Al–4 V

Cited by 152 publications

References 22 publications

Influence of Heat Treatment on the Workability of Modified 9Cr-2W Steel with Higher B Content

Influence of Heat Treatment on the Workability of Modified 9Cr-2W Steel with Higher B Content

Influence of Heat Treatment on the Workability of Modified 9Cr-2W Steel with Higher B Content

Quantitative Relationships between Mechanical Properties and Microstructure of Ti17 Alloy after Thermomechanical Treatment

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