Mechanisms of Microstructure Evolution in TiNi-Based Alloys under Warm Deformation and its Effect on Martensite Transformations

2015 ◽  
Vol 81-82 ◽  
pp. 245-259 ◽  
Author(s):  
Alexander Lotkov ◽  
Victor Grishkov ◽  
Oleg Kashin ◽  
Anatolii Baturin ◽  
Dorzhima Zhapova ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Warm Deformation ◽  
Martensite Transformations

Effect of Warm Deformation on Ferrite Microstructure Evolution in a Ti-Microalloyed Steel

2007 ◽  
Vol 558-559 ◽  
pp. 497-504
Author(s):  
Beitallah Eghbali
Keyword(s):  
Microstructure Evolution ◽  
Microalloyed Steel ◽  
Early Stage ◽  
Microstructural Analysis ◽  
Optical Microscope ◽  
Low Carbon ◽  
High Angle ◽  
Warm Deformation ◽  
Continuous Dynamic Recrystallization ◽  
Continuous Dynamic

Warm deformation is one of the promising hot rolling strategies for producing thin hot rolled steel strips. A better understanding of the microstructure evolution during warm deformation is important for a successful introduction of such processing into the industrial production. In the present research, the effect of deformation strain on the ferrite microstructure development in a low carbon Ti-microalloyed steel was investigated through warm torsion testing. Microstructural analysis with optical microscope and electron back-scattering diffraction was carried out on the warm deformed ferrite microstructures. The results show that at the early stage of deformation an unstable subboundaries network forms and low angle boundaries are introduced in the original grains. Then, with further straining, low angle boundaries transform into high angle boundaries and stable fine equiaxed ferrite grains form. It was considered that dynamic softening and dynamically formation of new fine ferrite grains, with high angle boundaries, were caused by continuous dynamic recrystallization of ferrite.

scholarly journals Formation of slip bands and microstructure evolution of Ti-5Al-5Mo-5V-3Cr-0.5Fe alloy during warm deformation process

2019 ◽  
Vol 770 ◽  
pp. 183-193 ◽  
Author(s):  
Jiangkun Fan ◽  
Hongchao Kou ◽  
Yudong Zhang ◽  
Lionel Germain ◽  
Ke Hua ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Deformation Process ◽  
Warm Deformation ◽  
Slip Bands

Microstructure Evolution of Martensitic Ti-6Al-4V Alloy during Warm Deformation

2014 ◽  
Vol 783-786 ◽  
pp. 679-684 ◽  
Author(s):  
Qi Chao ◽  
Peter Hodgson ◽  
Hossein Beladi
Keyword(s):  
Microstructure Evolution ◽  
Thermomechanical Processing ◽  
Microscopy Observation ◽  
Warm Deformation ◽  
Continuous Dynamic Recrystallization ◽  
Novel Approach ◽  
Resolution Electron ◽  
Continuous Dynamic ◽  
Equiaxed Grains ◽  
Electron Back Scattered Diffraction

The microstructure evolution of martensitic Ti-6Al-4V alloy was investigated through uniaxial hot compression at 700°C and a strain rate of 10-3s-1. A combination of scanning electron microscopy observation in conjunction with high resolution electron back scattered diffraction (EBSD) was used to characterize the microstructure in detail. The development of the microstructure displayed continuous fragmentation of martensitic laths with increasing strain (i.e. continuous dynamic recrystallization), concurrently with decomposition of supersaturated martensite resulting in the formation of equiaxed grains. At a strain of 0.8, an ultrafine equiaxed grained structure with mostly high angle grain boundaries was successfully obtained. The current work proposes a novel approach to produce equiaxed ultrafine grains in a Ti-6Al-4V alloy through thermomechanical processing of a martensitic starting microstructure.

scholarly journals MECHANICAL BEHAVIOR AND MICROSTRUCTURE EVOLUTION OF THE Ti-3Al-5Mo-4.5V ALLOY AT AN ELEVATED DEFORMATION TEMPERATURE

2021 ◽  
Vol 55 (3) ◽  
Author(s):  
Menglan Shen ◽  
Yuanming Huo ◽  
Tao He ◽  
Yong Xue ◽  
Yujia Hu ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Strain Rate ◽  
Microstructure Evolution ◽  
Deformation Temperature ◽  
High Performance ◽  
Warm Deformation ◽  
Deformation Region ◽  
Temperature Range ◽  
Softening Mechanism ◽  
Lower Strain

A high-performance titanium alloy requires a fine and homogenous microstructure. The rational deformation process parameters of the Ti-3Al-5Mo-4.5V (TC16) titanium alloy can contribute to achieving this important microstructure. Hot-compression experiments were performed at temperatures in the range 100–800 °C and at strain rates of 0.1 s–1 to 10.0 s–1. The effects of deformation temperatures and deformation rates on the mechanical behaviour and microstructure evolution were analysed and discussed. The softening mechanism of the Ti-3Al-5Mo-4.5V alloy at an elevated deformation temperature was revealed. Experimental results showed that 500 °C is the critical deformation temperature to distinguish the warm-deformation region of 100–400 °C and the hot-deformation region of 500–800 °C. The softening mechanism is dominated by -phase spheroidization in the temperature range 100–400 °C with a higher strain rate of 10.0 s–1. The softening mechanism is dominated by a local temperature rise in the temperature range 500–800 °C with a lower strain rate of 0.1 s–1.

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