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Thermal aging and alloysFeatured science projectScience project video

Observation

The results showed that the hardness of nickel  and steel alloy  started to decline after aging them at 800 °C. Titanium alloy hardness started to decline after aging at 1000 °C

Alloy

Description

Alloy hardness after aging at different temperatures

200°C

400°C

600°C

800°C

1000°C

Nickel

Inconel 6.25

A68

A68

A68

A65

A60

Titanium

Ti6A14V

C36

C36

C36

C36

C31

Steel

1018

B85

B85

B85

B81

B72

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Complexity level:
9
Project cost ($):
180
Time required:
1 day to prepare, 10 days for science fair project
Material availability:
Access to a hardware supplier or your school’s laboratory supplier. You will also need a Rockwell hardness tester and a high temperature dry box.
Safety concerns:

Ensure that the experiment is conducted in a properly equipped laboratory, under the supervision of your science teacher. Hot metal samples need to be handled with the use of proper equipment and protective gear.