Charpy Impact Testing: Why @ -20°? What @ Higher Temp?

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SUMMARY

Charpy impact testing is conducted at -20°C to assess the ductility and toughness of materials at lower temperatures, where atomic movement is reduced. Below the recrystallization temperature, materials exhibit decreased ductility, while above this temperature, ductility and toughness increase significantly. Testing at higher temperatures may yield misleading results regarding a material's performance in cold conditions, as the properties of materials change with temperature variations.

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  • Understanding of Charpy impact testing methodology
  • Knowledge of material properties, specifically ductility and toughness
  • Familiarity with recrystallization temperature concepts
  • Basic principles of atomic movement in materials science
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  • Study the methodology of Charpy impact testing and its significance
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Materials scientists, mechanical engineers, and quality control professionals involved in assessing material performance under varying temperature conditions.

manmeet123
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Please can anybody explain why Impact testing is carries out @ -20 degree or @ lower temparatures. & what will happen if it is conducted @ higher temp.
Please elaborate.
 
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Well - can you think of how the properties of materials might change with temperature?
 
russ_watters said:
Well - can you think of how the properties of materials might change with temperature?

Offcourse, Sir , below recrystallization temp ductility is less & above recrystallisation ductility & toughness values are more. Also movements of atoms are is faster @ higher temp & that will be lower @ Lower temp.
But if you can explain it in more specific technical way I will able to understand more effectively.

Waiting for ur reply.

thanking YoU!
 

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