scholarly journals Forming Features and Properties of Titanium Alloy Billets After Radial-Shear Rolling

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3179 ◽  
Author(s):  
Skripalenko ◽  
Galkin ◽  
Vladimirovich Karpov ◽  
Romantsev ◽  
Kaputkina ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Titanium Alloy ◽  
Rolling Mill ◽  
Stress Triaxiality ◽  
Grain Structure ◽  
Structure Changes ◽  
Ring Shape ◽  
Accumulated Strain ◽  
Experimental Rolling ◽  
Radial Shear Rolling

Radial-shear rolling (RSR) of titanium alloy billets was realized in a three-high rolling mill. Experimental rolling was simulated using DEFORM software. The purpose was to reveal how stress-strain state parameters, grain structure and hardness vary along the billet’s radius in the stationary stage of the RSR process. It was also the goal to establish a relation between stress state parameters, hardness and grain structure. Changes in the accumulated strain and the stress triaxiality were established by computer simulation. Hardness and grain size changes were obtained after experimental rolling. The novelty aspect is that both computer simulation and experimental rolling showed that there is a ring-shape area with lowered strength in the billet’s cross-section. The radius of the ring-shape area was predicted as a result of the research.

Structure changes in the surface layers of Ti-6Al-4V titanium alloy under electron beam treatment

2017 ◽  
Author(s):  
Elena Sinyakova ◽  
Alexey Panin ◽  
Olga Perevalova ◽  
Marina Kazachenok ◽  
Yurii Ivanov ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Electron Beam Treatment ◽  
Surface Layers ◽  
Structure Changes

Radial-Shear Rolling of Titanium Alloy Billets with Flat and Profiled Ends

2021 ◽  
Vol 2021 (13) ◽  
pp. 1681-1684
Author(s):  
M. M. Skripalenko ◽  
B. V. Karpov ◽  
M. N. Skripalenko ◽  
B. A. Romantsev ◽  
S. P. Galkin ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Radial Shear Rolling

Stress Triaxiality in Chip Segmentation During High Speed Machining of Titanium Alloy

2014 ◽  
Author(s):  
Xueping Zhang ◽  
Rajiv Shivpuri ◽  
Anil K. Srivastava
Keyword(s):  
Titanium Alloy ◽  
High Speed ◽  
Split Hopkinson Pressure Bar ◽  
Shear Bands ◽  
Stress Triaxiality ◽  
Machining Process ◽  
High Speed Machining ◽  
Hopkinson Pressure Bar ◽  
Static Tests ◽  
Pressure Stress

Beside strain intensity, stress triaxiality (pressure-stress states) is the most important factor to control initiation of ductile fracture in chip segmentation through affecting the loading capacity and strain to failure. The effect of stress triaxiality on failure strain is usually assessed by dynamic Split Hopkinson Pressure Bar (SHPB) or quasi-static tests of tension, compression, torsion, and shear. However, the stress triaxialities produced by these tests are considerably different from those in high speed machining of titanium alloys where adiabatic shear bands (ASB) are associated with much higher strains, stresses and temperatures. This aspect of shear localization and fracture are poorly understood in previous research. This paper aims to demonstrate the role of stress triaxiality in chip segmentation during machining titanium alloy using finite element method. This research promotes a fundamental understanding of thermo-mechanics of the high-speed machining process, and provides a logical insight into the fracture mechanism in discontinuous chips.

Acoustic Emission Study on Effect of Stress Triaxiality on Damage Micromechanisms in Near Alpha Titanium Alloy

2009 ◽  
Vol 28 (2) ◽  
pp. 85-90 ◽  
Author(s):  
Jalaj Kumar ◽  
Sony Punnose ◽  
M. Mahesh Kumar ◽  
T. Jayakumar ◽  
Vikas Kumar
Keyword(s):  
Acoustic Emission ◽  
Titanium Alloy ◽  
Stress Triaxiality ◽  
Alpha Titanium ◽  
Emission Study ◽  
Acoustic Emission Study

Grain-structure refinement in titanium alloy under different loading schedules

1996 ◽  
Vol 31 (17) ◽  
pp. 4635-4639 ◽  
Author(s):  
A. A. Korshunov ◽  
F. U. Enikeev ◽  
M. I. Mazurski ◽  
G. A. Salishchev ◽  
O. V. Dmitriev ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Structure Refinement ◽  
Grain Structure

Characterizing the Effect of Laser Power Density on Microstructure, Microhardness, and Surface Finish of Laser Deposited Titanium Alloy

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Rasheedat M. Mahamood ◽  
Esther T. Akinlabi ◽  
Mukul Shukla ◽  
Sisa Pityana
Keyword(s):  
Surface Roughness ◽  
Titanium Alloy ◽  
Power Density ◽  
Surface Finish ◽  
Laser Power ◽  
Optical Microscope ◽  
Laser Power Density ◽  
Grain Structure ◽  
Selection Of

This paper reports the effect of laser power density on the evolving properties of laser metal deposited titanium alloy. A total of sixteen experiments were performed, and the microstructure, microhardness and surface roughness of the samples were studied using the optical microscope (OP), microhardness indenter and stylus surface analyzer, respectively. The microstructure changed from finer martensitic alpha grain to coarser Widmastätten alpha grain structure as the laser power density was increased. The results show that the higher the laser power density employed, the smoother the obtained surface. The microhardness initially increased as the laser power density was increased and then decreased as the power density was further increased. The result obtained in this study is important for the selection of proper laser power density for the desired microstructure, microhardness and surface finish of part made from Ti6Al4V.

Fracture of an α/β titanium alloy under stress triaxiality states at 773 K

1996 ◽  
Vol 34 (9) ◽  
pp. 1483-1490 ◽  
Author(s):  
M. Bourgeois ◽  
X. Feaugas ◽  
M. Clavel
Keyword(s):  
Titanium Alloy ◽  
Stress Triaxiality

Grain structure and hardness of titanium alloy VT20 after electron-beam welding

2008 ◽  
Vol 50 (3-4) ◽  
pp. 187-190 ◽  
Author(s):  
V. I. Murav’ev ◽  
V. A. Kim ◽  
A. A. Shpileva
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Electron Beam Welding ◽  
Grain Structure ◽  
Alloy Vt20
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