Titanium Alloy Development Room Temperature Tensile Test Results

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Titanium Alloy DevelopmentRoom Temperature
Tensile Test Results

• Mesut Varlioglu varlmes_at_iit.edu
• Philip Nash nash_at_iit.edu
• Geping Li gpli_at_imr.ac.cn
• 1/16/04

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Tensile Samples
Zr Content,
4 6 8
10 ----------------------------------------
--------------------------------------------------
--------- Ingot, amount
1 1
1 x ---------------------------
--------------------------------------------------
---------------------- Tensile test samples,
Rolled below transus 1 1
2 2 Tensile test samples,
Rolled above transus x 1
1 1 --------------------------
--------------------------------------------------
----------------------- Mounted Samples, Rolled
below transus 1 1 1
1 Mounted samples, Rolled above
transus 1 1 1
1 ------------------------------------
--------------------------------------------------
------------- SAMPLES USED FOR HIGH TEMPERATURE
TESTS Rolled below transus
3 3 2
2 Rolled above transus
4 3
3 3 --------------------------
--------------------------------------------------
--------------------- Cut in two parts to see
inside defects. These were mounted from
samples tested at high temperature.
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ORIGINAL DATA
In original Ti-1100 alloy, the ultimate strength
and elongation are 98 ksi and 10 respectively at
600 ºC. Source Ti-1100 Source Data, TIMET.
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S-E Curves at Room Temperature
Rolling Temperature 1000 C.
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S-E Curves at Room Temperature
Rolling Temperature 1050 C.
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Relative Strength Over Temperature
Ti-1100
Source Collings, E. W., Physical metallurgy of
titanium alloys, 1984, p.112.
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UTS vs. Temperature
Rolling Temperature 1000 C. Rolling
Temperature 1050 C.
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Relative Strength Over Temperature
Rolling Temperature 1000 C. Rolling
Temperature 1050 C.
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Elongation Over Temperature
Rolling Temperature 1000 C. Rolling
Temperature 1050 C.
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Gripping the Sample
Fractured from the shoulder. The cross section is
needed to be smaller.
Sample 10 Zr bearing Ti-1100 alloy. Rolled
below transus.
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Current Etching Situation
Until finding a suitable etchant, it will be
difficult to evaluate the effect of rolling
temperature, also Zr content on the
microstructure.
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XRD Analysis

• The intermetallic alloy(s) in the Ti-1100 which
  gives the strength at high temperature is/are
  being investigated in XRD analysis.
• The XRD analysis was made with tensile samples
  which wasnt performed high temperature tensile
  test.

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XRD Graphs for rolled at 1000 C
Probably Ti3O5
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XRD Graphs for rolled at 1050 C
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FUTURE WORK

• Investigation of ingot surface structure and
  solidification defects
• Solidified microstructure changes with Gleeble
  testing machine.
• Observe the microstructure changes in rolling
  temperatures.
• Find the mechanism how Zr improve the high
  temperature strength.
• Perform SEM and EDS analysis to see which kind
  of intermetallic alloy is/are formed.