Hot Stamping of Titanium Alloy Sheets into U Shape with Concave Bottom and Joggle Using Resistance Heating

2016 ◽  
Vol 716 ◽  
pp. 915-922 ◽  
Author(s):  
Tomoyoshi Maeno ◽  
Yuya Yamashita ◽  
Ken-Ichiro Mori
Keyword(s):  
Titanium Alloy ◽  
Flow Stress ◽  
Partial Resistance ◽  
Hot Stamping ◽  
Alloy Sheet ◽  
High Flow ◽  
Resistance Heating ◽  
High Flow Stress ◽  
Reduction In Area

The hot stamping of α+β titanium alloy sheet into U shape with concave bottom using resistance heating were performed. Since both edges of the sheet in contact with a pair of electrodes were not heated, cracks occurred around the corners of the bottom due to the partially high flow stress. The cracks were prevented by slitting both edges before resistance heating because of the elongation of the edges. In addition, the hot stamping of titanium alloy sheet into joggle using partial resistance heating were performed. The distortion of sheet was reduced by reduction in area of resistance heating

Analysis of high flow stress and microstructural evolution of TC6 titanium alloy during isothermal forging

2004 ◽  
Vol 20 (10) ◽  
pp. 1257-1260 ◽  
Author(s):  
A.-M. Xiong ◽  
M.-Q. Li ◽  
W.-C. Huang ◽  
S.-H. Chen ◽  
H. Lin
Keyword(s):  
Titanium Alloy ◽  
Flow Stress ◽  
Microstructural Evolution ◽  
High Flow ◽  
Isothermal Forging ◽  
High Flow Stress

Prediction of Flow Stress Anisotropy and Tension Compression Asymmetry of Hot Rolled AZ31B Mg Alloy

2014 ◽  
Vol 911 ◽  
pp. 178-184 ◽  
Author(s):  
Majid Al-Maharbi ◽  
Ibrahim Karaman
Keyword(s):  
Flow Stress ◽  
Mechanical Response ◽  
High Flow ◽  
Mg Alloy ◽  
Stress Anisotropy ◽  
Self Consistent ◽  
Tension And Compression ◽  
High Flow Stress ◽  
Hot Rolled ◽  
Tension Compression Asymmetry

The mechanical response of a hot rolled polycrystalline AZ31B Mg plate along its two directions is predicted using a visco-plastic self-consistent (VPSC) model coupled with a dislocation-based hardening scheme. The hardening response along the in-plane and through thickness directions of the plate was successfully predicted in tension and compression. The high flow stress anisotropy and tension/compression asymmetry of the alloy is attributed mainly to the directionality of the tensile twinning. The high hardening rate after twinning is also predicted successfully using the above mentioned hardening scheme.

Development of Hot Stamping Process for Aircraft Titanium Alloy Parts Using Resistance Heating

2014 ◽  
Vol 55 (647) ◽  
pp. 1097-1101 ◽  
Author(s):  
Kiyoshi YAMAZAKI ◽  
Takashi YAMAGUCHI ◽  
Yohei MURAYAMA ◽  
Ken-ichiro MORI ◽  
Tomoyoshi MAENO
Keyword(s):  
Titanium Alloy ◽  
Hot Stamping ◽  
Resistance Heating ◽  
Stamping Process

scholarly journals Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticity

2013 ◽  
Vol 4 ◽  
pp. 173-179 ◽  
Author(s):  
Antti Tolvanen ◽  
Karsten Albe
Keyword(s):  
Molecular Dynamics ◽  
Flow Stress ◽  
Solid State ◽  
Force Field ◽  
Strain Hardening ◽  
High Flow ◽  
Cu Nanoparticles ◽  
Partial Dislocations ◽  
High Flow Stress ◽  
Dynamics Simulations

The plastic behaviour of individual Cu crystallites under nanoextrusion is studied by molecular dynamics simulations. Single-crystal Cu fcc nanoparticles are embedded in a spherical force field mimicking the effect of a contracting carbon shell, inducing pressure on the system in the range of gigapascals. The material is extruded from a hole of 1.1–1.6 nm radius under athermal conditions. Simultaneous nucleation of partial dislocations at the extrusion orifice leads to the formation of dislocation dendrites in the particle causing strain hardening and high flow stress of the material. As the extrusion orifice radius is reduced below 1.3 Å we observe a transition from displacive plasticity to solid-state amorphisation.

Deep Drawability and Bendability in Hot Stamping of Ultra-High Strength Steel Parts

2016 ◽  
Vol 716 ◽  
pp. 262-269 ◽  
Author(s):  
Ken-Ichiro Mori ◽  
Tomoyoshi Maeno ◽  
Yuzo Yanagita
Keyword(s):  
Flow Stress ◽  
High Strength Steel ◽  
Hot Stamping ◽  
High Strength ◽  
Resistance Heating ◽  
Deep Drawability ◽  
Ultra High Strength Steel ◽  
Small Flow ◽  
Blank Shape ◽  
Form Type

The deep drawability and bendability in hot stamping of ultra-high strength steel parts were examined. Although the cold drawability is greatly influenced by the blank shape, the limiting drawing depths for the square and circular blanks were equal for hot stamping because of small flow stress. In hot hat-shaped bending using draw-and form-type tools, the effect of the blankholder force generated with the draw-type tools on the springback was small, and the seizure for the form-type tools was smaller than that of the draw-type tools. Since both edges in contact with the electrodes are not heated for resistance heating, cracks were caused at the edges for resistance heating in the transversal directions in hot stamping of an S-rail with form-type tools, and thus it is required to control deformation of the non-heating zones.

A Novel Technique of Hot Stretch-Creep Forming via Resistance Heating

2014 ◽  
Vol 556-562 ◽  
pp. 550-556 ◽  
Author(s):  
Jun Jie Xiao ◽  
Dong Sheng Li ◽  
Xiao Qiang Li ◽  
Ming Jin Xu
Keyword(s):  
Titanium Alloy ◽  
Cost Effective ◽  
Electrical Current ◽  
Alloy Sheet ◽  
Innovative Technology ◽  
Resistance Heating ◽  
Dwelling Time ◽  
Relaxation Period ◽  
Novel Technique ◽  
Forming Temperature

In order to reduce the energy consumption and working procedure for manufacturing thin-walled titanium alloy components, a hot stretch-creep forming (SCF) technique via resistance heating is proposed to form the hard-to-form material. Firstly, the principle of hot SCF was introduced that the technique can manufacture titanium alloy components precisely because the residual stress relaxes in the material during the dwelling time. Secondly, the hot SCF equipment via resistance heating was developed, which makes use of electrical current for heating the titanium materials to improve their ductility. Then based on a set of optimized process parameters, including forming temperature, stretch velocity, post stretch percentage and dwelling time, a comparative experment of single curvature Ti-6Al-4V alloy sheet components was conducted via this innovative technology to examine the hot SCF equipments and the effect of creep forming. Results show that the component precision of the hot SCF is more precise than that of the hot stretch forming (SF) due to the creep in the stress relaxation period. Comparing to the as-received material, the yield strength of the material suffered hot SF decreases a little; while the strength suffered hot SCF increases a little. This novel technique shows a promising future to manufacture titanium sheet or profile components precisely as a feasible and cost-effective way.

Research on Quick Superplastic Forming for Aluminium Alloy Sheet

2012 ◽  
Vol 735 ◽  
pp. 301-306 ◽  
Author(s):  
Hai Jian Liang ◽  
Xiao Wei Wu ◽  
Yong Wang ◽  
Quan Lin Jin ◽  
Zhao Li Ma ◽  
...  
Keyword(s):  
Mass Production ◽  
Simulation Experiment ◽  
Hot Stamping ◽  
Superplastic Forming ◽  
Alloy Sheet ◽  
High Rate ◽  
Hot Forming ◽  
Forming Technology ◽  
Complex Process ◽  
Better Than

This article describes the high rate superplastic forming. The high rate superplastic forming technology is a new complex process,which integrates hot stamping and superplastic forming .It has feature of rapidity of the hot stamping and character of excellent formability of the superplastic forming.We obtained the best proportion of the hot forming and the superplastic forming through simulation experiment, and formed a car’s abonnet by applying the proportion.Compared with the high rate superplastic forming,the forming quality is better than that of hot forming. and the forming time is less than that of superplastic forming. Result shows that ,the high rate superplastic forming technology can meet the requirements for mass production.

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