Code No: R05311803

R05

Set No. 2

in

III B.Tech I Semester Supplementary Examinations,June 2010 HEAT TREATMENT TECHNOLOGY Metallurgy And Material Technology Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. Distinguish among the following:

(b) Upper bainite and lower bainite (c) Ms temperature and Mf temperature.

ld .

(a) Martempering and austempering

[6+5+5]

2. (a) Discuss the important characteristics of maraging steels?

[7+9]

or

(b) Mention different types of stainless steels and explain them fully?

3. (a) What is plasma carburising? How is methane gas ionized to cause carburizing? What are the advantages and limitation of plasma carburizing?

uW

(b) What is the necessity of heat treatment after carburizing? Explain. On what factors does the heat treatment depend? Discuss what is double heat treatment. [8+8] 4. (a) Discuss the functions of Nickel in maraging steels. (b) What is the difference in heat treatment between 18% Ni and the 25% Nickel maraging steels? (c) Explain why the maraging steels have excellent fracture toughness values. [4+6+6]

nt

5. (a) Why is copper a suitable material for automobile radiators? (b) Why aluminium alloy 2017 rivets have to be refrigerated until used? Explain. (c) Why are the Cu-Zinc alloys are not age-hardneable. Discuss.

Aj

(d) Why various combinations of stregth, ductility can be obtained in Alpha-Beta titanium alloys. [4+4+4+4]

6. (a) Give the classification of steels based on carbon content and alloy content. (b) Define and explain the term tempering. Explain the affect of various alloying elements on tempering process. [8+8]

7. (a) What are the factors which control graphitization in cast irons? Explain them. (b) What is equivalent carbon in cast irons? What is the significance of equivalent carbon? How is it determined. (c) Explain the factors that influence the microstructure of cast irons.

1

[6+6+4]

Code No: R05311803

R05

Set No. 2

8. (a) With the help of a neat sketch explain the working of a bottom loading vacuum furnace. What are its advantages and limitation compared to other types of vacuum furnaces? (b) What are the commonly used heating elements? Give the maximum temperatures for which they can be used. [12+4]

Aj

nt

uW

or

ld .

in

?????

2

Code No: R05311803

R05

Set No. 4

1. (a) Why is copper a suitable material for automobile radiators?

in

III B.Tech I Semester Supplementary Examinations,June 2010 HEAT TREATMENT TECHNOLOGY Metallurgy And Material Technology Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????

(b) Why aluminium alloy 2017 rivets have to be refrigerated until used? Explain.

ld .

(c) Why are the Cu-Zinc alloys are not age-hardneable. Discuss.

(d) Why various combinations of stregth, ductility can be obtained in Alpha-Beta titanium alloys. [4+4+4+4]

or

2. (a) What is plasma carburising? How is methane gas ionized to cause carburizing? What are the advantages and limitation of plasma carburizing?

(b) What is the necessity of heat treatment after carburizing? Explain. On what factors does the heat treatment depend? Discuss what is double heat treatment. [8+8] 3. (a) Discuss the functions of Nickel in maraging steels.

uW

(b) What is the difference in heat treatment between 18% Ni and the 25% Nickel maraging steels? (c) Explain why the maraging steels have excellent fracture toughness values. [4+6+6] 4. Distinguish among the following:

(a) Martempering and austempering

nt

(b) Upper bainite and lower bainite

(c) Ms temperature and Mf temperature.

[6+5+5]

5. (a) Discuss the important characteristics of maraging steels? [7+9]

Aj

(b) Mention different types of stainless steels and explain them fully?

6. (a) Give the classification of steels based on carbon content and alloy content. (b) Define and explain the term tempering. Explain the affect of various alloying elements on tempering process. [8+8]

7. (a) What are the factors which control graphitization in cast irons? Explain them. (b) What is equivalent carbon in cast irons? What is the significance of equivalent carbon? How is it determined. (c) Explain the factors that influence the microstructure of cast irons.

3

[6+6+4]

Code No: R05311803

R05

Set No. 4

8. (a) With the help of a neat sketch explain the working of a bottom loading vacuum furnace. What are its advantages and limitation compared to other types of vacuum furnaces? (b) What are the commonly used heating elements? Give the maximum temperatures for which they can be used. [12+4]

Aj

nt

uW

or

ld .

in

?????

4

Code No: R05311803

R05

Set No. 1

in

III B.Tech I Semester Supplementary Examinations,June 2010 HEAT TREATMENT TECHNOLOGY Metallurgy And Material Technology Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) What is plasma carburising? How is methane gas ionized to cause carburizing? What are the advantages and limitation of plasma carburizing?

ld .

(b) What is the necessity of heat treatment after carburizing? Explain. On what factors does the heat treatment depend? Discuss what is double heat treatment. [8+8]

or

2. (a) With the help of a neat sketch explain the working of a bottom loading vacuum furnace. What are its advantages and limitation compared to other types of vacuum furnaces? (b) What are the commonly used heating elements? Give the maximum temperatures for which they can be used. [12+4] 3. (a) What are the factors which control graphitization in cast irons? Explain them.

uW

(b) What is equivalent carbon in cast irons? What is the significance of equivalent carbon? How is it determined. (c) Explain the factors that influence the microstructure of cast irons.

[6+6+4]

4. (a) Discuss the functions of Nickel in maraging steels. (b) What is the difference in heat treatment between 18% Ni and the 25% Nickel maraging steels?

nt

(c) Explain why the maraging steels have excellent fracture toughness values. [4+6+6]

5. (a) Discuss the important characteristics of maraging steels? (b) Mention different types of stainless steels and explain them fully?

[7+9]

Aj

6. (a) Why is copper a suitable material for automobile radiators? (b) Why aluminium alloy 2017 rivets have to be refrigerated until used? Explain. (c) Why are the Cu-Zinc alloys are not age-hardneable. Discuss.

(d) Why various combinations of stregth, ductility can be obtained in Alpha-Beta titanium alloys. [4+4+4+4]

7. Distinguish among the following: (a) Martempering and austempering (b) Upper bainite and lower bainite 5

R05

Set No. 1

(c) Ms temperature and Mf temperature.

[6+5+5]

Code No: R05311803

8. (a) Give the classification of steels based on carbon content and alloy content. (b) Define and explain the term tempering. Explain the affect of various alloying elements on tempering process. [8+8]

Aj

nt

uW

or

ld .

in

?????

6

Code No: R05311803

R05

Set No. 3

in

III B.Tech I Semester Supplementary Examinations,June 2010 HEAT TREATMENT TECHNOLOGY Metallurgy And Material Technology Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Give the classification of steels based on carbon content and alloy content.

ld .

(b) Define and explain the term tempering. Explain the affect of various alloying elements on tempering process. [8+8] 2. (a) What is plasma carburising? How is methane gas ionized to cause carburizing? What are the advantages and limitation of plasma carburizing?

or

(b) What is the necessity of heat treatment after carburizing? Explain. On what factors does the heat treatment depend? Discuss what is double heat treatment. [8+8] 3. (a) What are the factors which control graphitization in cast irons? Explain them. (b) What is equivalent carbon in cast irons? What is the significance of equivalent carbon? How is it determined.

uW

(c) Explain the factors that influence the microstructure of cast irons.

[6+6+4]

4. (a) Discuss the important characteristics of maraging steels? (b) Mention different types of stainless steels and explain them fully?

[7+9]

5. (a) Why is copper a suitable material for automobile radiators? (b) Why aluminium alloy 2017 rivets have to be refrigerated until used? Explain. (c) Why are the Cu-Zinc alloys are not age-hardneable. Discuss.

nt

(d) Why various combinations of stregth, ductility can be obtained in Alpha-Beta titanium alloys. [4+4+4+4]

6. (a) Discuss the functions of Nickel in maraging steels.

Aj

(b) What is the difference in heat treatment between 18% Ni and the 25% Nickel maraging steels? (c) Explain why the maraging steels have excellent fracture toughness values. [4+6+6]

7. Distinguish among the following: (a) Martempering and austempering (b) Upper bainite and lower bainite (c) Ms temperature and Mf temperature.

7

[6+5+5]

Code No: R05311803

R05

Set No. 3

8. (a) With the help of a neat sketch explain the working of a bottom loading vacuum furnace. What are its advantages and limitation compared to other types of vacuum furnaces? (b) What are the commonly used heating elements? Give the maximum temperatures for which they can be used. [12+4]

Aj

nt

uW

or

ld .

in

?????

8