The process of reheating the martensitic steel to reduce its brittleness without any significant loss in its hardness is:
Question
The process of reheating the martensitic steel to reduce its brittleness without any significant loss in its hardness is:
Solution
The process of reheating the martensitic steel to reduce its brittleness without any significant loss in its hardness is known as tempering.
Here are the steps involved in the tempering process:
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Heat Treatment: The martensitic steel is heated to a temperature below its lower critical temperature. This is usually between 150°C to 700°C.
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Holding: The steel is then held at this temperature for a certain period of time. The exact time can vary, but it's usually at least one hour.
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Cooling: The steel is then cooled down, usually in still air. This slow cooling process allows the carbon trapped in the martensitic structure to diffuse out and precipitate as carbides.
This process results in a reduction of brittleness and an increase in toughness, without a significant loss in hardness. The exact properties of the tempered steel will depend on the temperature and time of the tempering process.
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