Tempering of steel Flashcards

1
Q

What is tempering?

A

reheating of steel below eutectoid temp, holding it and cooling to room temp

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2
Q

What effects does tempering have?

A

> increases toughness and ductility
decreases hardness and strength
increases dimensional stability
minimizes residual stresses

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3
Q

What effects does increasing tempering temp have?

A

higher toughness and ductility, lower hardness, lower yield stress and tensile strength

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4
Q

Tempered steel has ____ ___ of work hardening, quenched steel has ___ ___ of work hardening

A

low rate; high rate

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5
Q

Tempering range 150-200C

A

> gives modest increase in toughness without big loss in hardness
useful for high strength and fatigue resistance for primarily compressive load

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6
Q

Tempering > 425C

A

significantly increases toughness, but hardness and strength decrease a lot

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7
Q

Temper embrittlement (260-370C )

A

decreases toughness, but DOESN’T decrease ductility

> standard tensile test not useful for detecting temper embrittlement

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