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den301095 [7]
3 years ago
12

23.10 Tempering is a heat treatment applied to hardened steels that is best defined as which of the following (one correct answe

r): (a) heating and soaking at a temperature above the austenitizing level followed by rapid cooling, (b) heating and soaking at a temperature above the austenitizing level followed by slow cooling, (c) heating and soaking at a temperature below the austenitizing level followed by rapid cooling, or (d) heating and soaking at a temperature below the austenitizing level followed by slow cooling,?
Physics
1 answer:
charle [14.2K]3 years ago
3 0

Answer:

The correct answer is (a), heating and soaking at a temperature above the austenitizing level followed by rapid cooling.

Explanation:

Tempering is a heat treatment that is performed to change microstructure of steel <em>and increase it's hardness.</em>

It is done by heating above the austenitizing level, because for this heat treatment it's necesary to heat the steel to get <em>austenite structure</em> that is the <em>alotropic form of gamma iron.</em>

The procedure of tempering, continues with rapid cooling, because this way you get the microstructure with the best hardness properties, that is <em>martensite.</em>

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