Materials Science and Engineering Properties, SI Edition
Materials Science and Engineering Properties, SI Edition
1st Edition
ISBN: 9781305178175
Author: GILMORE, Charles
Publisher: Cengage Learning
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Chapter 5, Problem 5.18P

(1)

To determine

The transformation product after quenching and then after cool at room temperature.

(1)

Expert Solution
Check Mark

Explanation of Solution

Introduction:

The process of rapid cooling of a metal in water, or air or oil in order to alter the mechanical properties of the metal is called quenching. The process of quenching helps in the prevention of undesired low-temperature processes like phase transformation. Under normal conditions quenching is performed for few seconds.

(a)

The steel has eutectoid composition that is initially equilibrated at 730°C . When it is quenched to the temperature of 650°C and then hold for about 100 seconds, then the transformation product formed is the 100% pearlite.

(b)

When the product formed in part (a) is cooled to room temperature, then the transformation product that is formed will be the 100% pearlite. So, the final product after both the process will be 100% pearlite.

Conclusion:

Thus, the product formed after quenching is 100% pearlite and remains 100% pearlite when cooled at room temperature.

(2)

To determine

The transformation product after quenching and then after cool at room temperature.

(2)

Expert Solution
Check Mark

Explanation of Solution

Introduction:

The process of rapid cooling of a metal in water, or air or oil in order to alter the mechanical properties of the metal is called quenching. The process of quenching helps in the prevention of undesired low-temperature processes like phase transformation. Under normal conditions quenching is performed for few seconds.

(a)

The steel has eutectoid composition that is initially equilibrated at 730°C . When it is quenched to the temperature of 650°C and then holds for about 2 seconds, then the transformation product formed is the 100% austentite but it is unstable in nature.

(b)

When the product formed in part (a) is cooled to room temperature, then the transformation product that is formed will be the 100% martensite. It is stable in nature, so, the final transformation product will be 100% martensite.

Conclusion:

Thus, the product formed after quenching is 100% unstable austentite and product after cool at room temperature is 100% martensite.

(3)

To determine

The transformation product after quenching and then after cool at room temperature.

(3)

Expert Solution
Check Mark

Explanation of Solution

Introduction:

The process of rapid cooling of a metal in water, or air or oil in order to alter the mechanical properties of the metal is called quenching. The process of quenching helps in the prevention of undesired low-temperature processes like phase transformation. Under normal conditions quenching is performed for few seconds.

(a)

The steel has eutectoid composition that is initially equilibrated at 730°C . When it is quenched to the temperature of 650°C and then holds for about 10 seconds, then the transformation product formed is the 50% pearlite and 50% unstable austentite.

(b)

When the product formed in part (a) is cooled to room temperature, then the transformation product that is formed will be the 50% pearlite and 50% martensite. So, the final transformation product will be 50% pearlite and 50% martensite.

Conclusion:

Thus, the product formed after quenching is 50% pearlite and 50% unstable austentite and product after cool at room temperature is 50% pearlite and 50% martensite.

(4)

To determine

The transformation product after quenching and then after cool at room temperature.

(4)

Expert Solution
Check Mark

Explanation of Solution

Introduction:

The process of rapid cooling of a metal in water, or air or oil in order to alter the mechanical properties of the metal is called quenching. The process of quenching helps in the prevention of undesired low-temperature processes like phase transformation. Under normal conditions quenching is performed for few seconds.

(a)

The steel has eutectoid composition that is initially equilibrated at 730°C . When it is quenched to the temperature of 400°C and then holds for about 3.16 seconds, then the transformation product formed is the 100% unstable austentite.

(b)

When the product formed in part (a) is cooled to room temperature, then the transformation product that is formed will be the 100% martensite. So, the final transformation product will be 100% martensite.

Conclusion:

Thus, the product formed after quenching is 100% unstable austentite and product after cool at room temperature is 100% martensite.

(5)

To determine

The transformation product after quenching and then after cool at room temperature.

(5)

Expert Solution
Check Mark

Explanation of Solution

Introduction:

The process of rapid cooling of a metal in water, or air or oil in order to alter the mechanical properties of the metal is called quenching. The process of quenching helps in the prevention of undesired low-temperature processes like phase transformation. Under normal conditions quenching is performed for few seconds.

(a)

The steel has eutectoid composition that is initially equilibrated at 730°C . When it is quenched to the temperature of 400°C and then holds for about 25 seconds, then the transformation product formed is the 50% bainite and 50% unstable austentite.

(b)

When the product formed in part (a) is cooled to room temperature, then the transformation product that is formed will be the 50% bainite and 50% martensite. So, the final transformation product will be 50% bainite and 50% martensite.

Conclusion:

Thus, the product formed after quenching is 50% bainite and 50% unstable austentite, and product after cool at room temperature is 50% bainite and 50% martensite.

(6)

To determine

The transformation product after quenching and then after cool at room temperature.

(6)

Expert Solution
Check Mark

Explanation of Solution

Introduction:

The process of rapid cooling of a metal in water, or air or oil in order to alter the mechanical properties of the metal is called quenching. The process of quenching helps in the prevention of undesired low-temperature processes like phase transformation. Under normal conditions quenching is performed for few seconds.

(a)

The steel has eutectoid composition that is initially equilibrated at 730°C . When it is quenched to the temperature of 400°C and then holds for about 200 seconds, then the transformation product formed is the 100% bainite.

(b)

When the product formed in part (a) is cooled to room temperature, then the transformation product that is formed will be the 100% martensite. So, the final transformation product will be 100% martensite.

Conclusion:

Thus, the product formed after quenching is 100% bainite, and product after cool at room temperature is 100% martensite.

(7)

To determine

The transformation product after quenching and then after heating.

(7)

Expert Solution
Check Mark

Explanation of Solution

Introduction:

The process of rapid cooling of a metal in water, or air or oil in order to alter the mechanical properties of the metal is called quenching. The process of quenching helps in the prevention of undesired low-temperature processes like phase transformation. Under normal conditions quenching is performed for few seconds.

(a)

The steel has eutectoid composition that is initially equilibrated at 730°C . When it is quenched to the temperature of 0°C and then holds for about 10 seconds, then the transformation product formed is the 100% bainite.

(b)

When the product formed in part (a) is heated at the temperature of 600°C and holds for 1000 seconds then, the final product formed will be 100% tempered martensite.

Conclusion:

Thus, the product formed after quenching is 100% bainite, and product after heating is 100% tempered martensite.

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