Chapter 13, Problem 13.16P

Interpretation Introduction

(a)

Interpretation:

The heat treatment for $\text{1050}$ steel isothermally annealed and having hardness value as $\text{HRC23}$ needs to be stated.

Concept Introduction:

Material hardness is the property of a metal due to which material resist the plastic reformation. Plastic reformation means material reformation which undergoes non-reversible change. Hardness is the property of any material due to which it resist to bend, scratch or any other deformation. Hardness is not constant or fixed for all material, but it depends upon strength and plasticity of metal, material hardness is expressed in terms of hardness number.

Answer to Problem 13.16P

Heating to $\text{820°}$ and quenching to $\text{600°C}$.

Explanation of Solution

  

The given diagram is a TTT diagram which gases a relation between composition and temperature with time.

  

The given image shows temperature and time for ferrite, pearlite, bainite, and martensite following are the steps to obtain appropriate isothermal heat treatment.

For isothermally annealed $\text{1050}$ steel with $\text{HRC23}$ is:-

1) Step1: Heat the steel to $\text{820°C}$.

2) Step2: Quench it to $\text{600°C}$ and hold it for $\text{10 sec}$.

3) Step3: Quench again it to $\text{25°C}$.

Interpretation Introduction

(b)

Interpretation:

The heat treatment for $\text{10110}$ steel isothermally annealed and having hardness value as $\text{HRC40}$ needs to be stated.

Concept Introduction:

Material hardness is the property of a metal due to which material resist the plastic reformation. Plastic reformation means material reformation which undergoes non-reversible change. Hardness is the property of any material due to which it resist to bend, scratch or any other deformation. Hardness is not constant or fixed for all material, but it depends upon strength and plasticity of metal, material hardness is expressed in terms of hardness number.

Answer to Problem 13.16P

Heating to $\text{900°}$ and quenching to $\text{640°C}$.

Explanation of Solution

  

The given diagram is a TTT diagram which gases a relation between composition and temperature with time.

  

The given image shows temperature and time for ferrite, pearlite, bainite, and martensite following are the steps to obtain appropriate isothermal heat treatment.

For isothermally annealed $\text{10110}$ steel with $\text{HRC40}$ is:-

1) Step1: Heat the steel to $\text{900°C}$.

2) Step2: Quench it to yy $\text{640°C}$ and hold it for 10 sec.

3) Step3: Quench again it toyyy $\text{25°C}$.

Interpretation Introduction

(c)

Interpretation:

The heat treatment for yyyyy $\text{1080}$ steel isothermally annealed and having hardness value asyy $\text{HRC38}$ needs to be stated.

Concept Introduction:

Material hardness is the property of a metal due to which material resist the plastic reformation. Plastic reformation means material reformation which undergoes non-reversible change. Hardness is the property of any material due to which it resist to bend, scratch or any other deformation. Hardness is not constant or fixed for all material, but it depends upon strength and plasticity of metal, material hardness is expressed in terms of hardness number.

Answer to Problem 13.16P

Heating to $\text{780°}$ and quenching to $\text{600°C}$.

Explanation of Solution

  

The given diagram is a TTT diagram which gases a relation between composition and temperature with time.

  

The given image shows temperature and time for ferrite, pearlite, bainite, and martensite following are the steps to obtain appropriate isothermal heat treatment.

For isothermally annealed $\text{1080}$ steel with $\text{HRC 38}$ is:-

1) Step1: Heat the steel to $\text{780°C}$.

2) Step2: Quench it to $\text{600°C}$ and hold it for 10 sec.

3) Step3: Quench again it to $\text{25°C}$.

Interpretation Introduction

(d)

Interpretation:

The heat treatment for $\text{1050}$ steel isothermally annealed and having hardness value as $\text{HRC40}$ needs to be stated.

Concept Introduction:

Material hardness is the property of a metal due to which material resist the plastic reformation. Plastic reformation means material reformation which undergoes non-reversible change. Hardness is the property of any material due to which it resist to bend, scratch or any other deformation. Hardness is not constant or fixed for all material, but it depends upon strength and plasticity of metal, material hardness is expressed in terms of hardness number.

Answer to Problem 13.16P

Heating to $\text{820°}$ and quenching to $\text{390°C}$.

Explanation of Solution

  

The given diagram is a TTT diagram which gases a relation between composition and temperature with time.

  

The given image shows temperature and time for ferrite, pearlite, bainite, and martensite following are the steps to obtain appropriate isothermal heat treatment.

For isothermally annealed 1050 steel with HRC 40 is:-

1) Step1: Heat the steel to $\text{820°C}$.

2) Step2: Quench it to $\text{390°C}$ and hold it for $\text{100 sec}$.

3) Step3: Quench again it to $\text{25°C}$.

Interpretation Introduction

(e)

Interpretation:

The heat treatment for $\text{10110}$ steel isothermally annealed and having hardness value as $\text{HRC55}$ needs to be stated.

Concept Introduction:

Material hardness is the property of a metal due to which material resist the plastic reformation. Plastic reformation means material reformation which undergoes non-reversible change. Hardness is the property of any material due to which it resist to bend, scratch or any other deformation. Hardness is not constant or fixed for all material, but it depends upon strength and plasticity of metal, material hardness is expressed in terms of hardness number.

Answer to Problem 13.16P

Heating to $\text{900°}$ and quenching to $\text{320°C}$.

Explanation of Solution

  

The given diagram is a TTT diagram which gases a relation between composition and temperature with time.

  

The given image shows temperature and time for ferrite, pearlite, bainite, and martensite following are the steps to obtain appropriate isothermal heat treatment.

For isothermally annealed 10110 steel with HRC 55is:-

1) Step1: Heat the steel to $\text{900°C}$.

2) Step2: Quench it to $\text{320°C}$ and hold it for $\text{5000 sec}$.

3) Step3: Quench again it to $\text{25°C}$.

Interpretation Introduction

(f)

Interpretation:

The heat treatment for $\text{1080}$ steel isothermally annealed and having hardness value as $\text{HRC50}$ needs to be stated.

Concept Introduction:

Material hardness is the property of a metal due to which material resist the plastic reformation. Plastic reformation means material reformation which undergoes non-reversible change. Hardness is the property of any material due to which it resist to bend, scratch or any other deformation. Hardness is not constant or fixed for all material, but it depends upon strength and plasticity of metal, material hardness is expressed in terms of hardness number.

Answer to Problem 13.16P

Heating to $\text{780°}$ and quenching to $\text{330°C}$.

Explanation of Solution

  

The given diagram is a TTT diagram which gases a relation between composition and temperature with time.

  

The given image shows temperature and time for ferrite, pearlite, bainite, and martensite following are the steps to obtain appropriate isothermal heat treatment.

For isothermally annealed $\text{1080}$ steel with $\text{HRC 50}$ is:-

1) Step1: Heat the steel to $\text{780°C}$.

2) Step2: Quench it to $\text{330°C}$ and hold it for $\text{1000 sec}$.

3) Step3: Quench again it to $\text{25°C}$.