If we were to only use grain size refinement to attain the desired yield
strength of 400 MPa what grain size would we require?
2.6 µm - incorrect, you need to check your calculations, try again |
4.4 µm - Correct. |
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7.0 µm - incorrect, you need to check your calculations, try again. |
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15 µm - incorrect, you need to check your calculations, try again. |
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30 µm - incorrect, you need to check your calculations, try again. |
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Try again. |
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Click on your answer to check and make a note of the answer on your notepad.
You may also wish to review the section on strength - to do so click
here.
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NOTEPAD
The 3 most important properties for plate steel for structural applications:
Strength, Toughness and Weldability
Typical yield strength level for a family saloon car panel (roof or wing) is:
350 - 500 MPa (more accurately 400 MPa)
Maximum pearlite content in the steel:23%
Yield strength and tensile strength levels in the candidate steel: 238
MPa and 502 MPa respectively.
Strengthening mechanisms to increase the yield strength of the candidate
steel in order of preference: Grain size refinement, precipitation
strengthening, solid solution strengthening, dislocation strengthening,
microstructural strengthening
Grain size require to achieve a 400 MPa yield strength in the candidate steel: 4.4 µm
(note)
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