Hot workability of γ+α2 titanium aluminide: Development of processing map and constitutive equations

2012 ◽  
Vol 551 ◽  
pp. 169-186 ◽  
Author(s):  
R.K. Gupta ◽  
S.V.S. Narayana Murty ◽  
Bhanu Pant ◽  
Vijaya Agarwala ◽  
P.P. Sinha
Keyword(s):  
Constitutive Equations ◽  
Titanium Aluminide ◽  
Processing Map ◽  
Hot Workability

Hot workability, constitutive model and processing map of 3Cr23Ni8Mn3N heat resistant steel

Vacuum ◽  
2019 ◽  
Vol 165 ◽  
pp. 324-336 ◽  
Author(s):  
Zhongman Cai ◽  
Hongchao Ji ◽  
Weichi Pei ◽  
Xuefeng Tang ◽  
Xiaomin Huang ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Processing Map ◽  
Resistant Steel ◽  
Hot Workability ◽  
Heat Resistant Steel ◽  
Heat Resistant

Hot Deformation and Dynamic Recrystallization in Titanium Aluminide

2018 ◽  
Vol 941 ◽  
pp. 1391-1396 ◽  
Author(s):  
Nitish Bibhanshu ◽  
Satyam Suwas
Keyword(s):  
Shear Band ◽  
Dynamic Recrystallization ◽  
Titanium Aluminide ◽  
Volume Fraction ◽  
Shear Bands ◽  
Hot Workability ◽  
Compression Tests ◽  
Electron Backscattered Diffraction ◽  
Gamma Titanium Aluminide ◽  
Z Contrast

The hot workability of gamma titanium aluminide alloy, Ti-48Al-2V-2Nb, was assessed in the cast condition through a series of compression tests conducted over a range of temperatures (1000 to 1175 °C) and at the strain rate of 10 S-1. The mechanism of dynamics recrystallization has been investigated from SEM Z-contrast images and from the Electron backscattered diffraction EBSD as well. It has been observed that volume fraction of the recrystallized grains increases with increasing the deformation temperature. The major volume fraction of the recrystallized grains was observed in the shear band which was forming at an angle 45 ̊ with respect to the compression direction. The mechanism of breaking of the laths and the region of the dynamic recrystallization were also investigated from the SEM Z-contrast image and EBSD. The dynamic recrystallization occurred in the region of the broken laths and shear bands. The breaking of the laths was because of the kinking of the lamellae. The shear band, kinked lamellae and dynamic recrystallized region where all investigated simultaneously.

Hot Workability Map for Near-α Titanium Alloy Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si-0.7Nd

2012 ◽  
Vol 482-484 ◽  
pp. 1453-1456
Author(s):  
Ming Man Li ◽  
Qui Jian Xun ◽  
Shang Zhou Zhang
Keyword(s):  
Titanium Alloy ◽  
Dynamic Recrystallization ◽  
Power Dissipation ◽  
Processing Map ◽  
Flow Instability ◽  
Shear Bands ◽  
Hot Workability ◽  
Adiabatic Shear Bands ◽  
Β Phase ◽  
Power Dissipation Efficiency

The characterizations of hot working behavior of a near-α titanium alloy using the approach of processing maps are described. Processing map in the α+β region exhibit a domain of the globularization process of lamellar structure and α dynamic recrystallization with a power dissipation efficiency of 0.6-0.9. In the β region the map exhibited a domain centered around 1060°C and 0.1 s-1with a power dissipation efficiency of 0.76 where the β phase undergoes dynamic recrystallization. At higher strain rate flow instability occurs in the α+β region due to adiabatic shear bands formation as well as in the β region due to flow inhomogeneity of β phase.

Optimization of the hot workability for an extrude AZ80 Mg alloy using the processing map and Kriging meta-model

2015 ◽  
Vol 16 (6) ◽  
pp. 1149-1156 ◽  
Author(s):  
Sang Kyun Oh ◽  
Kwang Ki Lee ◽  
Young-Sang Na ◽  
Chang Hee Suh ◽  
Yun-Chul Jung ◽  
...  
Keyword(s):  
Processing Map ◽  
Mg Alloy ◽  
Hot Workability ◽  
Meta Model

Effect of hot-forging on beta phase transformation of a high niobium containing titanium aluminide alloy

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540009
Author(s):  
Liang Cheng ◽  
Xiangyi Xue ◽  
Bin Tang ◽  
Hongchao Kou ◽  
Jinshan Li
Keyword(s):  
Titanium Aluminide ◽  
Volume Fraction ◽  
Hot Forging ◽  
Beta Phase ◽  
Phase Region ◽  
Practical Significance ◽  
Hot Workability ◽  
Present Alloy ◽  
Β Phase ◽  
B2 Phase

In this paper, ingot breakdown process of a high Nb containing TiAl alloy with a chemical composition of Ti –42.63 Al –8.11 Nb –0.21 W –0.09 Y (at.%) has been investigated under conventional forging conditions. It was found that the present alloy possesses superior hot-workability that can be successfully forged by conventional upsetting route due to the appearance of large amount of β/B2 phase, though shear band was observed in the forged-pancake. Further studies revealed that hot-working performed in (α + β) phase region which can effectively impede the β → α transformation and thus significantly increase the volume fraction of β/B2 phase. In contrast, the amount of β/B2 phase was notably reduced by heat treatment at the same conditions. This stress-induced effect is considered to be responsible to the superior hot-workability of the present alloy and the mechanism has been discussed and reasonably clarified. It was also suggested that the stress-induced effect has practical significance that it allows the implementation of conventional multi-step forging process which can develop fine and uniform microstructures suitable for secondary processing.

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