Microstructual Analysis of Stress Relieving on the Thermal Deformation Behaviors of Titanium Tailor-Welded Blanks

2013 ◽  
Vol 677 ◽  
pp. 169-172
Author(s):  
Chi Ping Lai ◽  
Luen Chow Chan
Keyword(s):  
Heat Treatment ◽  
Thermal Deformation ◽  
Room Temperature ◽  
Cold Working ◽  
Working Temperature ◽  
Tailor Welded Blanks ◽  
Working Stress ◽  
Heating Device ◽  
Stress Relieving ◽  
Deformation Behaviors

This paper aims to investigate the microstructual analysis of titanium tailor-welded blanks (Ti-TWBs) undergoing the stress relieving (SR) during a thermal deformation. A modified HILLE machine, with a specific heating device that can adjust the working temperature, was employed in this study. Qualified Ti-TWBs specimens were prepared in different widths and lengths. In order to compare the performance of both SR and non-SR Ti-TWBs, the formability analyses at room temperature and around 550degC were then carried out accordingly. The limit dome heights (LDH) of these specimens were measured and it was found that the ductility of the SR Ti-TWBs was improved due to the removal of the hardening effect as well the working stress during the cold working. Moreover, the fracture surface of the Ti-TWBs also revealed that the microstructure was fine and equaxial after the heat treatment. It can be concluded that the microstructual evolution is useful to enhance the strength of Ti-TWBs.

Evolution of Young’s Modulus of Cold-Deformed Pure Aluminium in a Tension Test

2018 ◽  
Vol 941 ◽  
pp. 1348-1353
Author(s):  
Isaac Isarn ◽  
Jordi Jorba ◽  
Antoni Roca ◽  
Núria Llorca-Isern
Keyword(s):  
Heat Treatment ◽  
Plastic Deformation ◽  
Young’S Modulus ◽  
Crystallographic Orientation ◽  
Deformation Process ◽  
Room Temperature ◽  
Cold Working ◽  
Young's Modulus ◽  
Tension Test ◽  
Pure Aluminium

Young’s modulus varies with crystallographic orientation, temperature and alloying, but also with cold working and heat treatment. In this work, the evolution of Young’s modulus in polycrystalline pure aluminium (99.5%) with different cold-working levels determined at room temperature is presented. The deformation process was carried out in a universal tension machine and measurements were performed by ultrasounds. The Young’s modulus diminished from 70 to 65 GPa for 0-5% of deformation (elongation) and then increased with successive cold-working (68 GPa for 8.5% of elongation). These values were obtained 8 hours after plastic deformation was applied. This behaviour is compared with the Young’s modulus determined by extensometry in the same material. In this case, the modulus decreased from 70 to 63 GPa (3.5% of elongation) and then increased until 68 GPa for 10% of elongation. Results obtained on pure iron (Armco) deformed in the same conditions are included for comparative purposes. Values of Young’s modulus measured during the springback process after plastic deformation at different level are also included. Values obtained are between 10-15% lower than those measured 8 hours after plastic deformation.

Effects of Stress Relieving on Limit Dome Height of Titanium Tailor-Welded Blanks at Elevated Temperatures

2006 ◽  
Vol 532-533 ◽  
pp. 977-980 ◽  
Author(s):  
Chi Ping Lai ◽  
Luen Chow Chan ◽  
Chi Loong Chow
Keyword(s):  
Room Temperature ◽  
Elevated Temperatures ◽  
Heating System ◽  
Dome Height ◽  
Control Panel ◽  
Blank Holder ◽  
Limit Dome Height ◽  
Tailor Welded Blanks ◽  
Heat Treated ◽  
Stress Relieving

This paper aims to study the effect of stress relieving on Limit Dome Height (LDH) of Ti-TWBs at elevated temperatures. This is achieved by developing a newly constructed heating system. The elevated temperature of the system can be varied and monitored by a separately control panel. All Ti-TWBs were prepared and used to examine the LDHs under elevated temperatures. Selected specimens were heat-treated at 600°C within an hour before being formed by HILLE machine. Meanwhile, the temperature of tool heating system was also adjusted from room temperature to 550°C. Specified tests were carried out to examine the stress relieving effects of Ti-TWBs on the LDHs with the temperature control panel. In addition, investigations were carried out to ascertain whether the elevated temperatures of the critical tooling components, i.e. the die and the blank holder, could result in any significant effects on LDHs of Ti-TWBs. The findings show that LDHs of Ti-TWBs can be improved by stress relieving. The stress relieving condition can be obtained by nearly isothermal forming of specimens at a range of 550°C to 600°C.

Mechanical Property of Single Phase Co-Ni-Cr-Mo Based Superalloy Produced by Cold Working and Recrystallization Heat Treatment

2004 ◽  
Vol 449-452 ◽  
pp. 573-576 ◽  
Author(s):  
Jun Kyung Sung ◽  
Gil-Su Hong ◽  
Won Yong Kim ◽  
Mok Soon Kim ◽  
Sun Keun Hwang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Mechanical Property ◽  
Grain Size ◽  
Steady State ◽  
Yield Strength ◽  
Room Temperature ◽  
Cold Working ◽  
Flow Behavior ◽  
Deformation Twinning ◽  
Average Grain Size

Mechanical property of carbon-free Co-Ni-Cr-Mo based superalloy was investigated at room temperature and at 943 K. Cold working and subsequent recrystallization heat treatment was carried out to produce an equiaxed grain structure. The average grain size was controlled to 28 and 238 µm in order to understand the effect of grain size on mechanical property and flow behavior. At room temperature and 943 K, 0.2% offset yield strength increased with decreasing grain size to exhibit grain size dependence. At 943 K, a specimen with the average grain size of 28 µm showed higher yield strength than that obtained with a specimen having the average grain size of 238 µm. A steady-state like behavior leading to an extensive ductility was observed in the fine-grained specimen. {111}<112> deformation twinning was found to correlate with the steady-state like behavior in the true stress-true strain curve. It was suggested that grain refinement is favor to enhance the fracture strength and allow the deformation twinning to occur.

ALUMINUM 3004

Alloy Digest ◽  
1974 ◽  
Vol 23 (4) ◽  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
High Temperature ◽  
Magnesium Alloy ◽  
Cold Working ◽  
Heat Treating ◽  
Temperature Performance ◽  
Good Workability ◽  
Manganese Magnesium

Abstract ALUMINUM 3004 is nominally an aluminum-manganese-magnesium alloy which cannot be hardened by heat treatment; however, it can be strain hardened by cold working. It has higher strength than Aluminum 3003 and good workability, weldability and resistance to corrosion. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fatigue. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Al-51. Producer or source: Various aluminum companies. Originally published June 1957, revised April 1974.

The Phase Analysis of Panzhihua Vanadic Titanomagnetite Ore before and after Heat Treatment

2013 ◽  
Vol 807-809 ◽  
pp. 2110-2114
Author(s):  
Shu Quan Wan ◽  
De Jun Lan ◽  
Hong Bo Han ◽  
Cai Long Zhou
Keyword(s):  
Heat Treatment ◽  
Phase Analysis ◽  
Room Temperature ◽  
Before And After

The phases of Panzhihua vanadic titanomagnetite ore were studied by using XRF and XRD. XRF results show that the original ore mainly contain the elements, Fe, Ti, Si, Ca, Al, S, Mg, P, Mn, V and etc. XRD results show that the main substances in original ore were Fe3O4 and FeTiO3, and the minor phases cannot be clearly studied by XRD. After heat treatment for 10h at 573K in atmospheric ambient, the phases of the ore have been slightly changed. And after heat treatment for 10h at 1073K in atmospheric ambient, then cooled for 48h to room temperature, the main phases of the ore have almost been changed to Fe2O3 and Fe2TiO5.

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