Essentials Of Materials Science And Engineering
Essentials Of Materials Science And Engineering
4th Edition
ISBN: 9781337670845
Author: ASKELAND
Publisher: Cengage
Question
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Chapter 13, Problem 13.33P
Interpretation Introduction

(a)

Interpretation:

The hardness of 4340 steel needs to be determined.

  Essentials Of Materials Science And Engineering, Chapter 13, Problem 13.33P , additional homework tip  1

Figure 1

Concept Introduction:

Hardness is a material property of a metal due to which material resist the plastic reformation. Plastic reformation means material reformation which undergoes non-reversible change. Hardness is a material property to resistance to twisting, scraping or cutting. 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.

Expert Solution
Check Mark

Answer to Problem 13.33P

The hardness of 4340 steel is HRC60

Explanation of Solution

Given Information:

Jominy distanceCooling rate (0c/sec)
31650
41636
61622
81615
101610

Calculations:

From the given diagram and table, the 4340 steel cannot obtain hardness near to 40. So the hardness would be larger than 40HRC range. Thus, the hardnessof 4340 steel is HRC60

Interpretation Introduction

(b)

Interpretation:

The cooling rate and distance to hardness of 8640 steel needs to be determined.

  Essentials Of Materials Science And Engineering, Chapter 13, Problem 13.33P , additional homework tip  2

Figure 2

Concept Introduction:

Hardness is a material property of a metal due to which material resist the plastic reformation. Plastic reformation means material reformation which undergoes non-reversible change. Hardness is a material property to resistance to twisting, scraping or cutting. 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.

Expert Solution
Check Mark

Answer to Problem 13.33P

Hardness level ranges from 28.5 mm to 31.8 mm and the cooling rate from 30C to 40C

Explanation of Solution

Given Information:

Jominy distanceCooling rate (0c/sec)
31650
41636
61622
81615
101610

Calculations:

  Essentials Of Materials Science And Engineering, Chapter 13, Problem 13.33P , additional homework tip  3

Figure 3

The equation byjominy is 1th15 of an inch and from the figure, the hardenability curve the hardness obtained is in the range of 28.5 mm to 31.8 mm.

By using the Jominy table, the cooling rate obtained is 30C to 40C

Interpretation Introduction

(c)

Interpretation:

The cooling rate and distance to the hardness of 9310 steel needs to be determined.

  Essentials Of Materials Science And Engineering, Chapter 13, Problem 13.33P , additional homework tip  4

Figure 4

Concept Introduction:

Hardness is a material property of a metal due to which material resist the plastic reformation. Plastic reformation means material reformation which undergoes non-reversible change. Hardness is a material property to resistance to twisting, scraping or cutting. 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.

Expert Solution
Check Mark

Answer to Problem 13.33P

The distance to the hardness of 9310 steel is 15.8 mm to 19 mm and cooling rate is from 80C to 100C

Explanation of Solution

Given Information:

Jominy distanceCooling rate (0C/sec)
31650
41636
61622
81615
101610

Calculations:

  Essentials Of Materials Science And Engineering, Chapter 13, Problem 13.33P , additional homework tip  5

Figure 5

The equation byjominy is 1th15 of an inchand from the figure, the hardenability curve the hardness obtained is in the range of 15.8 mm to 19 mm

By using the Jominy table, the cooling rate obtained is 80C to 100C

Interpretation Introduction

(d)

Interpretation:

The cooling rate and distance tothehardness of 4320 steel needs to be determined.

  Essentials Of Materials Science And Engineering, Chapter 13, Problem 13.33P , additional homework tip  6

Figure 6

Concept Introduction:

Hardness is a material property of a metal due to which material resist the plastic reformation. Plastic reformation means material reformation which undergoes non-reversible change. Hardness is a material property to resistance to twisting, scraping or cutting. 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.

Expert Solution
Check Mark

Answer to Problem 13.33P

The distance to the hardness of 4320 steel is 38 mm to 40 mm and cooling rate is from 220C

Explanation of Solution

Given Information:

Jominy distanceCooling rate (0c/sec)
31650
41636
61622
81615
101610

Calculations:

  Essentials Of Materials Science And Engineering, Chapter 13, Problem 13.33P , additional homework tip  7

Figure 7

The equation byjominy is, 1th15 of an inchand from the figure, the hardenability curve the hardness obtained is in the range of 38 mm to 40 mm

By using the Jominy table, the cooling rate obtained is 220C.

Interpretation Introduction

(e)

Interpretation:

The cooling rate and distance tothehardness of 1050 steel needs to be determined.

  Essentials Of Materials Science And Engineering, Chapter 13, Problem 13.33P , additional homework tip  8

Figure 8

Concept Introduction:

Hardness is a material property of a metal due to which material resist the plastic reformation. Plastic reformation means material reformation which undergoes non-reversible change. Hardness is a material property to resistance to twisting, scraping or cutting. 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.

Expert Solution
Check Mark

Answer to Problem 13.33P

The distance to the hardness of 1050 steel is 6.4 mm to 7.2 mm and cooling rate is from 320C to 360C

Explanation of Solution

Given Information:

Jominy distanceCooling rate (0c/sec)
31650
41636
61622
81615
101610

Calculations:

  Essentials Of Materials Science And Engineering, Chapter 13, Problem 13.33P , additional homework tip  9

Figure 9

The equation byjominy is, 1th15 of an inchand from the figure, the hardenability curve the hardness obtained is in the range of 6.4 mm to 7.2 mm

By using the Jominy table, the cooling rate obtained is 320C to 360C

Interpretation Introduction

(f)

Interpretation:

The cooling rate and distance to hardness of 1080 steel needs to be determined.

  Essentials Of Materials Science And Engineering, Chapter 13, Problem 13.33P , additional homework tip  10

Figure 10

Concept Introduction:

Hardness is a material property of a metal due to which material resist the plastic reformation. Plastic reformation means material reformation which undergoes non-reversible change. Hardness is a material property to resistance to twisting, scraping or cutting. 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.

Expert Solution
Check Mark

Answer to Problem 13.33P

The distance tothehardness of 1080 steel is 9.5 mm to 11 mm and cooling rate is from 170C to 220C

Explanation of Solution

Given Information:

Jominy distanceCooling rate (0c/sec)
31650
41636
61622
81615
101610

Calculations:

  Essentials Of Materials Science And Engineering, Chapter 13, Problem 13.33P , additional homework tip  11

Figure 11

The equation byjominy is, 1th15 of an inch and from the figure, the hardenability curve the hardness obtained is in the range of 9.5 mm to 11 mm.

By using the Jominy table, the cooling rate obtained is 170C to 220C.

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