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3 years ago

How would you expect an increase in the austenite grain size to affect the hardenability of a steel alloy? Why?

Engineering

1 answer:

seraphim [82]3 years ago

3 0

Answer:

The hardenability increases with increasing austenite grain size, because the grain boundary area is decreasing. This means that the sites for the nucleation of ferrite and pearlite are being reduced in number, with the result that these transformations are slowed down, and the hardenability is therefore increased.

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2 years ago

The variation of the pressure of a fluid with density at constant temperature is known as the _____.

qaws [65]

The variation of the pressure of a fluid with density at constant temperature is known as the coefficient of compressibility.

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2 years ago

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3 years ago

Using the tables for water determine the specified property data at the indicated state. For H2O at T = 140 °C and v = 0.2 m3/kg

Dennis_Churaev [7]

Answer:

$h = 1429.74\,\frac{kJ}{kg}$

Explanation:

The determination of any further properties requires the knowledge of two independent properties. (Temperature and specific volume in this case). The specific volumes for saturated liquid and vapor at 140 °C are, respectively:

$\nu_{f} = 0.001080\,\frac{m^{3}}{kg}$

$\nu_{g} = 0.50850\,\frac{m^{3}}{kg}$

Since $\nu_{f} < \nu < \nu_{g}$ , it is a liquid-vapor mixture. The quality of the mixture is:

$x = \frac{\nu-\nu_{f}}{\nu_{g}-\nu_{f}}$

$x = \frac{0.2\,\frac{m^{3}}{kg} - 0.001080\,\frac{m^{3}}{kg} }{0.50850\,\frac{m^{3}}{kg} - 0.001080\,\frac{m^{3}}{kg} }$

$x = 0.392$

The specific enthalpies for saturated liquid and vapor at 140 °C are, respectively:

$h_{f} = 589.16\,\frac{kJ}{kg}$

$h_{g} = 2733.5\,\frac{kJ}{kg}$

The specific enthalpy is:

$h = h_{f}+x\cdot (h_{g}-h_{f})$

$h = 589.16\,\frac{kJ}{kg}+0.392\cdot \left( 2733.5\,\frac{kJ}{kg} - 589.16\,\frac{kJ}{kg} \right)$

$h = 1429.74\,\frac{kJ}{kg}$

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4 years ago

Read 2 more answers

How is air pressure affected by the shape of an aircraft wing

oksano4ka [1.4K]

Answer:

Airplanes' wings are curved on top and flatter on the bottom. That shape makes air flow over the top faster than under the bottom. As a result, less air pressure is on top of the wing. This lower pressure makes the wing, and the airplane it's attached to, move up.

Explanation:

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3 years ago