scholarly journals The Influences of Process Annealing Temperature on Microstructure and Mechanical Properties of near β High Strength Titanium Alloy Sheet

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1478 ◽  
Author(s):  
Zhaoxin Du ◽  
Yan Ma ◽  
Fei Liu ◽  
Ning Xu ◽  
Yanfei Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Cold Rolling ◽  
Phase Field ◽  
Annealing Temperature ◽  
High Strength ◽  
Goss Texture ◽  
Β Phase ◽  
Cold Rolled ◽  
Process Annealing

The influences of process annealing temperature during cold rolling on microstructure and mechanical properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe near β high strength titanium alloy sheets have been investigated. Results showed that the alloy mainly included the deformation induced dislocation structures after cold rolling but no obvious band structure, twin crystal or martensite were observed in this work. The texture components, which were affected by process annealing, are mainly γ-fiber, α-fiber and weak Goss texture. The γ-fiber of alloy when process annealed at 780 °C (α/β phase field) is stronger than at 830 °C (β phase field), where the Goss texture of alloy with process annealing temperature of 830 °C is more obvious. Results of annealing heat treatments showed that the recrystallization of the cold rolled was basically completed in a relatively short time of 2 min at 750 °C for 2 min. The refinement of grain size led to a significant increase of plasticity compared to rolled alloy. Results of tensile testing of aged alloy display the excellent combination of strength and plasticity, and the cold rolled alloy with process annealed at α/β phase field exhibits the better mechanical properties than at β phase field.

Effects of Cold-Rolling Reduction on Microstructure and Mechanical Properties of Ti50Zr30Nb10Ta10 Alloy

2016 ◽  
Vol 849 ◽  
pp. 376-381
Author(s):  
Ming Long Li ◽  
Yu Jie Geng ◽  
Chen Chen ◽  
Shu Jie Pang ◽  
Tao Zhang
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Plastic Strain ◽  
Cold Rolling ◽  
Reduction Ratio ◽  
High Fracture ◽  
Dendrite Structure ◽  
Microstructure And Mechanical Properties ◽  
Cold Rolling Reduction ◽  
Cold Rolled

The effects of cold-rolling with different reduction ratios of 70%-90% on the microstructure and mechanical properties of Ti50Zr30Nb10Ta10 alloy were investigated. It was found that the β-Ti phase in this alloy was stable under cold-rolling. With the increase in reduction ratio from 70% to 90%, the microstructure of the alloys evolved from deformed dendrite structure to fiber-like structure. The alloy cold-rolled with the reduction ratio of 70% exhibited optimum mechanical properties of combined high fracture strength of 1012 MPa and plastic strain of 10.1%, which are closely correlated with the dendrite structure of the alloy. It is indicated that the proper cold-rolling is an effective way to improve the mechanical properties of the titanium alloy.

Microstructure Characteristics and Mechanical Properties of in-Situ Composite Steel Processed by Severe Cold-Rolling and Subsequent Annealing

2010 ◽  
Vol 168-170 ◽  
pp. 889-894
Author(s):  
Jun Zhao ◽  
Zhi Wang ◽  
Han Zhang ◽  
Hong Yan Zhai ◽  
Quan Xing Wen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Lath Martensite ◽  
Rolling Direction ◽  
High Strength ◽  
Subsequent Annealing ◽  
Microstructure Characteristics ◽  
In Situ Composite ◽  
Cold Rolled

In this paper, Q235 steel was investigated in order to manufacturing ultra-high strength material. The process of severe cold-rolling and low temperature annealing of lath martensite effectively reduced the crystal size from about 300 nm to 20 nm, and introduced mass weak interfaces in steel, has been demonstrated a new promising technique for producing in-situ composite multi-nanolayer steel with ultra-high strength (b 2112 MPa). Cold rolling and subsequent annealing have great impact on microstructure evolution as well as material mechanical properties. In the as-rolled state, the strength is approximately four times increased than as-received material (hot-rolled state, b 515 MPa), which is attributed to work hardening and grain refining during cold rolling. As the cold-rolled sample subjected to further annealing below 500 , deformed microstructure underwent further recovery and recrystallization, finally became refined equiaxed grains, microstructure characteristics along rolling direction arrangement was decreased; In addition to ultrafine ferrite grains, nano-carbides precipitated uniformly in the specimen annealed at 500 , total elongation increased to 16%, the corresponding yield strength was 1208MPa, much higher than that of as-received samples. The phenomenon of fracture delamination was observed from the specimens, which were cold-rolled and annealed at 500 , and the delamination plane was parallel to the rolling plane. In-situ composite weak interfaces effect has great impact on the fracture surface.

Effect of Cold Rolling on the Microstructure and Mechanical Behaviors of High-Nitrogen and Low-Nickel Alloy

2021 ◽  
Vol 904 ◽  
pp. 143-147
Author(s):  
You Yang ◽  
Hong Shuai Li ◽  
Yu Xin Huang
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
High Strength ◽  
Average Thickness ◽  
High Nitrogen ◽  
Cold Rolled ◽  
Strength And Plasticity ◽  
Nitrogen Alloy ◽  
Rolling Deformation ◽  
Twin Thickness

The effects of different cold rolling deformations on the microstructure and mechanical properties of high nitrogen and low nickel alloys were investigated. The microstructure of high nitrogen alloys with different rolling deformations were characterized by EBSD and TEM. The tensile mechanical properties of the high nitrogen alloys at room temperature were tested. The results showed that the microstructure of the cold rolled high nitrogen alloy with deformation of 0% to 70% shows a twinning process. The twin thickness of the high nitrogen alloy without deformation is micron degree. When the rolling deformation is over 50%, the average thickness of the deformation twin is 23nm. When the rolling deformation increases to 70%, the average thickness of the twin is 14nm. When the rolling deformation increases from 0% to 70%, the cold rolled high nitrogen alloy exhibits high strength (1001-2236 MPa) and excellent plasticity (5.9%-64.1%). It is beneficial to have a good combination of strength and plasticity after rolling deformation.

Effect of Severe Plastic Deformation on Mechanical Properties of Fe-Ni-Mn High Strength Steel

2009 ◽  
Vol 83-86 ◽  
pp. 16-23 ◽  
Author(s):  
H. Shirazi ◽  
Mahmoud Nili-Ahmadabadi ◽  
A. Fatehi ◽  
S. Hossein Nedjad
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Equal Channel Angular Pressing ◽  
High Strength ◽  
Hardness Measurement ◽  
Aged Alloy ◽  
Martensitic Steels ◽  
Subsequent Aging ◽  
Angular Pressing ◽  
Cold Rolled

Fe-Ni-Mn martensitic steels show excellent age hardenability but suffer from embrittlement after aging. Discontinuous coarsening of grain boundary precipitates was found as the main source of embrittlement. Effect of cold rolling and equal channel angular pressing on the mechanical properties of an Fe-10Ni-7Mn steel was investigated. Cold rolling for 20%, 40%, 60%, 80% and 90% and equal channel angular pressing for four passes through the Bc route were carried out on a solution annealed material with subsequent aging at 753 K. Hardness measurement, tensile test and scanning electron microscopy were used to study mechanical properties and microstructural features of the as-deformed and aged alloys. Improvement in tensile properties of the as-deformed and aged alloys was found. A tensile strength of about 1840 MPa along with 3% elongation were determined for cold rolled by 90% thickness reduction and aged alloy, while conventional steel shows a premature fracture stress of 820 MPa with zero ductility. It was also indicated that after heavy cold rolling ductility increases in comparison to the equal channel angular pressed and aged alloy.

Recrystallization Annealing of Cold Rolled 9Cr 1Mo Ferritic Steel Containing Silicon

2009 ◽  
Vol 282 ◽  
pp. 9-16
Author(s):  
M.N. Mungole ◽  
M. Surender ◽  
R. Balasubramaniam ◽  
S. Bhargava
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Cold Rolling ◽  
Grain Growth ◽  
Ferritic Steel ◽  
Annealing Temperature ◽  
Recrystallization Annealing ◽  
Cold Rolled

9Cr-1Mo ferritic steel samples containing 0.2 and 0.5 wt % silicon in 40 % cold rolled state were recrystallize-annealed at 1100, 1200 and 1300 K. The grain growth and mechanical properties after recrystallization-annealing for 20 hr to 100 hr were investigated. No significant grain growth was observed even after 100 hr annealing at 1100 and 1200 K. The recrystallization-annealing at 1200 K resulted grains smaller in size than those at 1100 K. Annealing at 1300 K exhibited the enhanced grain growth with decorative microstructures. Initial annealing after cold rolling at 1100 K exhibited low hardness which further increased with annealing temperature. Annealing at 1100 K for 20 hrs exhibited low yield strength and ultimate tensile strength compared to those of as received samples. However, for 100 hrs annealing these properties remained nearly constant for 0.2 Si composition and increased marginally for 0.5 Si composition. Recrystallization-annealing exhibited improved ductility for both the compositions.

Grain Size Effect on Mechanical Properties of Titanium Alloy

2014 ◽  
Vol 626 ◽  
pp. 548-552 ◽  
Author(s):  
Cho-Pei Jiang ◽  
Zong Han Huang
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Titanium Alloy ◽  
Size Effect ◽  
Annealing Temperature ◽  
Grain Size Effect ◽  
Β Phase ◽  
Commercially Pure ◽  
Α Phase ◽  
Pure Grade

The aim of this study is to investigate the effect of grain size on mechanical properties of commercially pure grade 2 (CP2) titanium bar with a diameter of 5 mm. The results reveal that the microstructure of β-phase forms when the annealing temperature exceeds 800oC. The formation of β-phase leads to reduce the ductility but increase hardness. The strength coefficient, yielding stress and hardness decrease with increasing of grain size when the microstructure of specimen is the α-phase.

Effects of Deformation Strains and Annealing Temperatures on Mechanical Properties of Martensitic Steels

2010 ◽  
Vol 654-656 ◽  
pp. 218-221 ◽  
Author(s):  
Jong Chul Lee ◽  
Ui Gu Kang ◽  
Chang Suk Oh ◽  
Sung Joon Kim ◽  
Won Jong Nam
Keyword(s):  
Mechanical Properties ◽  
Annealing Temperature ◽  
Cold Deformation ◽  
High Strength ◽  
Total Elongation ◽  
Good Combination ◽  
Martensitic Steels ◽  
Annealing Temperatures ◽  
Cold Rolled ◽  
Carbide Particles

The effects of deformation strains and annealing temperatures on microstructures and mechanical properties of martensitic steels were examined. The amount of cold deformation was changed as 30%, 50% and 60%, and annealing temperatures varied from 500°C to 600°C. In samples cold rolled 30%, the dominant microstructure for an annealing at 500°C was dislocation substructures with uniformly distributed rod-shaped carbide particles. For an annealing at 600°C, the microstructure consisted of equiaxed ultrafine grains, spherical carbide particles and elongated dislocation substructures. A proper annealing temperature for martensitic steels received 30% reduction, showing a good combination of a high strength, 1230MPa, and an adequate total elongation. 9.4%, was found as 500°C.

Effect of Heat Treatment on Microstructure and Properties of Ti-6.5Al-1.5Mo-2.5V-2Zr Titanium Alloy

2013 ◽  
Vol 652-654 ◽  
pp. 1076-1079
Author(s):  
Bing Zhou ◽  
Shang Zhou Zhang
Keyword(s):  
Heat Treatment ◽  
Titanium Alloy ◽  
Phase Field ◽  
Annealing Temperature ◽  
Microstructure And Properties ◽  
Β Phase ◽  
Heat Treated ◽  
Alloy Heat ◽  
Relationship Of ◽  
The Relationship

The relationship of microstructure and properties of Ti-6.5Al-1.5Mo-2.5V-2Zr titanium alloy heat-treated in the α+β phase field was studied. It was found that globular or bimodal microstructures were obtained for alloy annealed at 400-950°C. Ductility decreased with increasing annealing temperature, while the strength showed a minimum at 800°C. The properties at the center of billet are lower than that at the edge due to the low cooling rate after forging. With the increase of test temperature, the strength decreased and ductility increased.

Microstructures and Mechanical Properties of a New Type of High Temperature Titanium Alloy

2020 ◽  
Vol 993 ◽  
pp. 208-216
Author(s):  
Ya Peng Cui ◽  
Zi Yong Chen ◽  
Xiao Zhao Ma ◽  
Ying Ying Liu ◽  
Zhi Lei Xiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
High Temperature ◽  
High Strength ◽  
Solution Temperature ◽  
Β Phase ◽  
Α Phase ◽  
Heat Treated ◽  
New Type ◽  
Microstructures And Mechanical Properties

The microstructures and mechanical properties of a new type near α high temperature titanium alloy Ti-6.5Al-2.5Sn-9Zr-0.5Mo-0.25Si-1Nb-1W-0.3Re (wt. %) (denoted as TA6.5) were investigated. It was observed that the microstructure of forged TA6.5 mainly consisted of deformed lamellar α phase, small amount of equiaxed α phase, and residual β phase, exhibiting high strength and comparatively low elongation. Three different heat treatments processes were performed on forged TA6.5. The results showed that all heat treated alloys displayed high tensile strengths, and the values of strength parameters were almost unchanged with the increasing solution temperature, ascribing to the combination effects of decreasing primary α phase and increasing contents and widths of secondary α phase and lamellas. The tensile elongations of heat treated alloys tested at 650 °C decreased slightly with the increasing solution temperature, which is due to the increased width of secondary α lamellas and the generation of coarse grain boundary α phase. TA6.5 treated in the process of 990 °C/1 h/AC+700 °C/4 h/AC exhibited excellent comprehensive mechanical properties, i.e. the ultimate tensile strength of 829 MPa, yield strength of 707 MPa and elongation of 18.73% respectively.

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