A piece of 0.8% \(\ce{C}\) steel is heated to above its recrystallisation temperature and then normalised.
In what medium is this piece of steel cooled?
- Air
- Brine
- Sand
- Water
ENGINEERING, PPT 2016 HSC 26c
Structural steel `text{I}`-beams are used to make a crane were hot-rolled then normalised.
Explain why normalising was chosen as the heat treatment process. Support your answer with a labelled sketch of the resulting microstructure. (4 marks)
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Advantages of normalising:
→ An increase in strength. Grain size strengthening is achieved due to the fine uniform grain structure produced by normalising.
→ When compared to other strengthening methods it is relatively economical.
→ Normalising relieves stress.
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Advantages of normalising:
→ An increase in strength. Grain size strengthening is achieved due to the fine uniform grain structure produced by normalising.
→ When compared to other strengthening methods it is relatively economical.
→ Normalising relieves stress.
♦ Mean mark 43%.
ENGINEERING, PPT 2019 HSC 24b
Normalised high-tensile steel has been chosen for the manufacture of a wing support beam.
- Draw and label the microstructures of a normalised high-tensile steel and an annealed high-tensile steel. (2 marks)
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- Explain how the microstructure produced by normalising high-tensile steel improves the steel's suitability for this application. (2 marks)
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i. Microstructures
ii. → The strength of the steel is markedly increased.
→ Normalising produces finer and more uniform grains.
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i. Microstructures
♦♦♦ Mean mark (i) 26%.
ii. → The strength of the steel is markedly increased.
→ Normalising produces finer and more uniform grains.
♦ Mean mark (ii) 41%.
ENGINEERING, PPT 2021 HSC 25c
The pins in some truss joints are made from normalised mild steel.
How does the process of normalising affect the material properties of these pins? (2 marks)
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