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Chapter 11: Problem 27

Name two thermal properties of a liquid medium that will influence its quenching effectiveness.

Short Answer

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Question: Identify two thermal properties of a liquid medium that influence its quenching effectiveness. Answer: The two thermal properties of a liquid medium that influence its quenching effectiveness are thermal conductivity and specific heat capacity.

Step by step solution

01

Property 1: Thermal Conductivity

Thermal conductivity (\(k\)) is a property of the liquid which measures its ability to transfer heat. A higher value of thermal conductivity means that the liquid can absorb and dissipate heat more effectively. This will result in faster and more efficient quenching of the hot object. Hence, the thermal conductivity of a liquid medium plays a significant role in determining its quenching effectiveness.
02

Property 2: Specific Heat Capacity

Specific heat capacity (\(c_p\)) is another important thermal property of a liquid medium that influences its quenching effectiveness. Specific heat capacity represents the amount of heat required to raise the temperature of a unit mass of the substance by 1 degree Celsius. A higher specific heat capacity means that the liquid can absorb more heat without its own temperature rising significantly. This allows the liquid to effectively remove heat from the hot object, leading to improved quenching performance. Therefore, the specific heat capacity of a liquid medium is crucial in determining its effectiveness in quenching hot materials.

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Most popular questions from this chapter

What is the principal difference between wrought and cast alloys?

Construct radial hardness profiles for the following: (a) A \(75-\mathrm{mm}\) (3-in.) diameter cylindrical specimen of an 8640 steel alloy that has been quenched in moderately agitated oil (b) A \(50-\mathrm{mm}\) (2-in.) diameter cylindrical specimen of a 5140 steel alloy that has been quenched in moderately agitated oil (c) A \(90-\mathrm{mm}\left(3 \frac{1}{2}-\text { in. }\right)\) diameter cylindrical specimen of an 8630 steel alloy that has been quenched in moderately agitated water (d) A 100-m m$ (4-in.) diameter cylindrical specimen of an 8660 steel alloy that has been quenched in moderately agitated water

Give the approximate temperature at which it is desirable to heat each of the following iron-carbon alloys during a full anneal heat treatment: (a) \(0.20 \mathrm{wt} \% \mathrm{C}\), (b) \(0.60 \mathrm{wt} \% \mathrm{C}\) (c) \(0.76 \mathrm{wt} \% \mathrm{C}\), and (d) 0.95 wt \(\%\) C.

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