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The hot tearing in a metal casting is due to
[ME 2014,Set-3]
- a)high fluidity
- b)high melt temperature
- c)wide range of solidification temperature
- d)low coefficient of thermal expansion
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
The hot tearing in a metal casting is due to[ME 2014,Set-3]a)high flui...
Hot tearing in a metal casting refers to the cracking or tearing that occurs during the solidification of the metal. It is a common defect that can compromise the structural integrity of the casting. The correct answer to this question is option 'C', which states that hot tearing is due to a wide range of solidification temperature.
Explanation:
Wide Range of Solidification Temperature:
- Hot tearing occurs when there is a significant difference in the solidification temperature of different regions within the casting.
- This difference in solidification temperature creates thermal stresses within the metal as it solidifies, leading to cracking and tearing.
- The regions with higher solidification temperature solidify first, while the regions with lower solidification temperature continue to remain in the liquid state for a longer time.
- As the solidified regions contract during cooling, they exert tensile stresses on the still-liquid regions, resulting in hot tearing.
Factors Affecting Solidification Temperature:
- The solidification temperature of a metal is influenced by various factors, including its composition, cooling rate, and thermal properties.
- The composition of the metal affects its melting point and the temperature range over which solidification occurs.
- A wide range of solidification temperature can be caused by the presence of different alloying elements or impurities in the metal.
Effect of High Fluidity, High Melt Temperature, and Low Coefficient of Thermal Expansion:
- High fluidity refers to the ability of the molten metal to flow easily into the mold cavity. It is not directly related to hot tearing.
- High melt temperature and low coefficient of thermal expansion may affect the overall casting process but do not directly contribute to hot tearing.
Conclusion:
- Hot tearing in a metal casting is primarily caused by a wide range of solidification temperature.
- The thermal stresses generated due to the difference in solidification temperature lead to cracking and tearing within the casting.
Explanation:
Wide Range of Solidification Temperature:
- Hot tearing occurs when there is a significant difference in the solidification temperature of different regions within the casting.
- This difference in solidification temperature creates thermal stresses within the metal as it solidifies, leading to cracking and tearing.
- The regions with higher solidification temperature solidify first, while the regions with lower solidification temperature continue to remain in the liquid state for a longer time.
- As the solidified regions contract during cooling, they exert tensile stresses on the still-liquid regions, resulting in hot tearing.
Factors Affecting Solidification Temperature:
- The solidification temperature of a metal is influenced by various factors, including its composition, cooling rate, and thermal properties.
- The composition of the metal affects its melting point and the temperature range over which solidification occurs.
- A wide range of solidification temperature can be caused by the presence of different alloying elements or impurities in the metal.
Effect of High Fluidity, High Melt Temperature, and Low Coefficient of Thermal Expansion:
- High fluidity refers to the ability of the molten metal to flow easily into the mold cavity. It is not directly related to hot tearing.
- High melt temperature and low coefficient of thermal expansion may affect the overall casting process but do not directly contribute to hot tearing.
Conclusion:
- Hot tearing in a metal casting is primarily caused by a wide range of solidification temperature.
- The thermal stresses generated due to the difference in solidification temperature lead to cracking and tearing within the casting.
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Community Answer
The hot tearing in a metal casting is due to[ME 2014,Set-3]a)high flui...
The correct option is (c) wide range of solidification temperature
Hot tear is a defect that occurs during solidification of a casting. Though steel is poured at high temperature, this temperature is low relative to the high freezing temperature range of steel.
Hot tear is a defect that occurs during solidification of a casting. Though steel is poured at high temperature, this temperature is low relative to the high freezing temperature range of steel.
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