Essentials of Materials Science and Engineering, SI Edition
Essentials of Materials Science and Engineering, SI Edition
4th Edition
ISBN: 9781337672078
Author: ASKELAND, Donald R., WRIGHT, Wendelin J.
Publisher: Cengage Learning
Question
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Chapter 13, Problem 13.14P
Interpretation Introduction

(a)

Interpretation:

The microstructure present in 1050 steel heated at 820°C, quench to 650°C, and hold for 90s and quench to 25°C needs to be determined.

Concept Introduction:

Heat treatment is a process used to change the material's physical and chemical properties. Metallurgical is the most frequent applications. Heat treatment is used in the production of many products such as glass. Heat treatment includes heating or cooling to achieve the required outcome, usually at extreme temperatures.

Expert Solution
Check Mark

Answer to Problem 13.14P

The microstructure that is present after going through the various processes, is ferrite and pearlite.

Explanation of Solution

  Essentials of Materials Science and Engineering, SI Edition, Chapter 13, Problem 13.14P , additional homework tip  1

When 1050 steel is heated to 820°C the steel is present in the austenite form. During the quenching to 650°C and hold for 90s (seconds), pearlite and ferrite are formed. On further quenching to 25°C, the only microstructure remaining are ferrite and pearlite. Thus, only ferrite and pearlite remain after going through heating and quenching.

Interpretation Introduction

(b)

Interpretation:

The microstructure present in steel heated at 820°C, quenching to 450°C, and hold for 90s and quench to 25°C needs to be determined.

Concept Introduction:

Heat treatment is a process used to change the material'sphysical and chemical properties. Metallurgical is the most frequent applications. Heat treatment is used in the production of many products such as glass. Heat treatment includes heating or cooling to achieve the required outcome, usually at extreme temperatures.

Expert Solution
Check Mark

Answer to Problem 13.14P

Bainite remains as microstructure after going through the heating and quenching process.

Explanation of Solution

  Essentials of Materials Science and Engineering, SI Edition, Chapter 13, Problem 13.14P , additional homework tip  2

When 1050 is heated to 820°C, the steel is present in the austenite form. During the quenching to 450°C and held for 90s, bainite is formed.On further quenching to 25°C bainiteremains a microstructure.

Thus, bainite microstructure remains after going through heating and quenching.

Interpretation Introduction

(c)

Interpretation:

The microstructure present in steel after being heated at 820°C and quenched to 25°C needs to be determined.

Concept Introduction:

Heat treatment is a process used to change the material's physical and chemical properties. Metallurgical is the most frequent applications. Heat treatment is used in the production of many products such as glass. Heat treatment includes heating or cooling to achieve the required outcome, usually at extreme temperatures.

Expert Solution
Check Mark

Answer to Problem 13.14P

Martensite remains as microstructure after heated at 820°C and quenched to 25°C.

Explanation of Solution

  Essentials of Materials Science and Engineering, SI Edition, Chapter 13, Problem 13.14P , additional homework tip  3

When 1050 steel is heated at 820°C it is in the form of austenite, after quenching to 25°C martensite is obtained.

Interpretation Introduction

(d)

Interpretation:

The microstructure present in 1050 steel after being heated at 820°C, quenched to 720°C, hold for 100s and further quenched to 25°C needs to be described.

Concept Introduction:

Heat treatment is a process used to change the materials physical and chemical properties. Metallurgical is the most frequent applications. Heat treatment is used in the production of many other products such as glass. Heat treatment includes heating or cooling to achieve the required outcome, usually at extreme temperatures.

Expert Solution
Check Mark

Answer to Problem 13.14P

Ferrite and martensite remain as microstructure after heated at 820°C, quenched to 720°C, held for 100s and quench to 25°C.

Explanation of Solution

  Essentials of Materials Science and Engineering, SI Edition, Chapter 13, Problem 13.14P , additional homework tip  4

When 1050 steel is heated to 820°C it is in the form of austenite. After quenching to 720°C and held for 100s ferrite is formed while a little austenite remains in the microstructure. After further quenching to 25°C, the remaining austenite gets transformed into martensite. Thus, only ferrite and martensite remains as microstructure.

Interpretation Introduction

(e)

Interpretation:

The microstructure present in 1050 steel when heated at 820°C, quenched to 720°C, hold for 100s, quenched to 400°C and further hold for 500s andquenched to 25°C needs to be decribed.

Concept Introduction:

Heat treatment is a process used to change the material's physical and chemical properties. Metallurgical is the most frequent applications. Heat treatment is used in the production of many products such as glass. Heat treatment includes heating or cooling to achieve the required outcome, usually at extreme temperatures.

Expert Solution
Check Mark

Answer to Problem 13.14P

Ferrite and bainite remain as microstructure.

Explanation of Solution

  Essentials of Materials Science and Engineering, SI Edition, Chapter 13, Problem 13.14P , additional homework tip  5

When the 1050 steel is heated at 820°C it is present in the austenite form. During quenching to 720°C and held for 100s, ferrite is formed, also a little austenite remains in the microstructure.After further quenching to 400°C and being held for 500s, the remaining austenite transforms to bainite. At the last quenching to 25°C, the microstructure that remain are ferrite and bainite.

Interpretation Introduction

(f)

Interpretation:

The microstructure present in 1050 steel when heated at 820°C, quench to 720°C, and hold for 100s, quench to 400°C and further hold for 10s, and quench to 25°C needs to be decribed.

Concept Introduction:

Heat treatment is a process used to change the material's physical and chemical properties. Metallurgical is the most frequent applications. Heat treatment is used in the production of many products such as glass. Heat treatment includes heating or cooling to achieve the required outcome, usually at extreme temperatures.

Expert Solution
Check Mark

Answer to Problem 13.14P

Ferrite, bainite, and martensite remain as microstructure.

Explanation of Solution

  Essentials of Materials Science and Engineering, SI Edition, Chapter 13, Problem 13.14P , additional homework tip  6

When 1050 steel is heated, it is in the austenite form. During the quenching to 720 oC and held for 100 s, ferrite is formed but a little austenite remains in a microstructure. On further quenching to 400 oC and held for 10 s, some austenite transforms into bainite, but still some of the austenite remains in the solution. After quenching to 25 C, the remaining austenite changes to martensite. At last, the microstructure remaining are ferrite, bainite, and martensite.

Interpretation Introduction

(g)

Interpretation:

The microstructure in 1050 steel when it is heated at 820°C quenched to, further heated to 500°C and hold for 103s then air cool to 25°C needs to be decribed.

Concept Introduction:

Heat treatment is a process used to change the material's physical and chemical properties. Metallurgical is the most frequent applications. Heat treatment is used in the production of many products such as glass. Heat treatment includes heating or cooling to achieve the required outcome, usually at extreme temperatures.

Expert Solution
Check Mark

Answer to Problem 13.14P

Tempered martensite is the only microstructures that remain in 1050 steel after heating quenching and air cooling.

Explanation of Solution

  Essentials of Materials Science and Engineering, SI Edition, Chapter 13, Problem 13.14P , additional homework tip  7

When 1050 steel is heated to 820°C, it is in the form of austenite. The austenite transforms into martensite after quenchingto 25°C. When it is heated to 500°C and held for 103s, the martensite gets tempered and after it is air-cooled to room temperature, final microstructure which is remaining is tempered martensite.

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