Essentials Of Materials Science And Engineering
Essentials Of Materials Science And Engineering
4th Edition
ISBN: 9781337385497
Author: WRIGHT, Wendelin J.
Publisher: Cengage,
Question
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Chapter 8, Problem 8.70P
Interpretation Introduction

(a)

Interpretation:

The recovery, recrystallization and grain growth temperature needs to be estimated.

Concept Introduction:

Recovery takes place at the low annealing temperature. Recrystallization is a process of formation of new defect-free grains. In Recrystallization,grains of a crystal structure comes in a new structure or new crystal shape. Grain growth is the process of increasing the size of grains at high temperature. Grain growth occurs when recovery and recrystallization are complete.

Expert Solution
Check Mark

Answer to Problem 8.70P

Recover temperature is 2800C

Recrystallization temperature is 3300C

Grain growth temperature is 3800C

Explanation of Solution

Given Information:

The following data shows the properties of cold worked material after annealing.

Annealing temperature (0C)Residual stresses (Psi)Tensile strength (Psi)Grain size (in)
25021000520000.0030
27521000520000.0030
3005000520000.0030
3250520000.0030
3500340000.0010
3750300000.0010
4000270000.0035
4250250000.0072

From the above data, one can plot a graph of tensile strength, residual stress and grain size of cold worked metal at the given annealing temperature.

Essentials Of Materials Science And Engineering, Chapter 8, Problem 8.70P , additional homework tip  1

Essentials Of Materials Science And Engineering, Chapter 8, Problem 8.70P , additional homework tip  2

Essentials Of Materials Science And Engineering, Chapter 8, Problem 8.70P , additional homework tip  3

  • Recover takes place at low annealing temperature and when there is no change in grain size thus, from figure recovery temperature should be near 280 0C .
  • At recrystallization temperature, tensile strength is low and nucleation and growth of grain take place.
  • From the figure, 330 0C is the temperature where grain growth and nucleation take place and tensile strength is minimum.
  • Grain growth takes place a high annealing temperature from the figure, grain growth occurs at 380 0C the annealing temperature.
Interpretation Introduction

(b)

Interpretation:

The temperature at which high strength and conductivity occur needs to be determined.

Concept Introduction:

Recovery temperature increases high electrical conductivity. Conductivity is the measure of the ease at which an electric charge can pass through the material. The conductor gives very little resistance to the flow of thermal energy or an electric current. High Strength is the quality of material to be strong and also the capacity of a material or an object to withstand great force or pressure.

Expert Solution
Check Mark

Answer to Problem 8.70P

High strength and high electrical conductivity occurs at 320 0C.

Explanation of Solution

Essentials Of Materials Science And Engineering, Chapter 8, Problem 8.70P , additional homework tip  4

  • Recovery temperature improves the high strength and high electrical conductivity.
  • Strength is increased by heating material in recovery temperature.
  • Thus, from figure high strength and high electrical conducting occurs at 320 0C .
Interpretation Introduction

(c)

Interpretation:

The temperature which is appropriate for hot working process should be determined.

Concept Introduction:

Hot working is carried out above the recrystallization temperature of a material.

Expert Solution
Check Mark

Answer to Problem 8.70P

Hot working takes place at 375 0C.

Explanation of Solution

  • Hot working is a process carried out above recrystallization temperature of a given material
  • Hot working improves strength.
  • Hence, a suitable temperature for hot working is 375 0C .
Interpretation Introduction

(d)

Interpretation:

The melting temperature of the alloy should be determined.

Concept Introduction:

The relation between melting temperature and recrystallization temperature is as follows.

  Tr=0.4Tm

Where,

  Tr=Recrystalization temperatureTm=Melting temperature

Expert Solution
Check Mark

Answer to Problem 8.70P

Melting temperature of the alloy is 1235 0C.

Explanation of Solution

The relation between melting temperature and recrystallization temperature is as follows.

  Tr=0.4Tm

Where,

  Tr=Recrystalization temperature= 330  0CTm=Melting temperature

Substituting the values:

  0.4Tm=330 0CTm=330+2730.4=1508 0KTm=1235 0C

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Chapter 8 Solutions

Essentials Of Materials Science And Engineering

Ch. 8 - Prob. 8.11PCh. 8 - Prob. 8.12PCh. 8 - Prob. 8.13PCh. 8 - Prob. 8.14PCh. 8 - Prob. 8.15PCh. 8 - Prob. 8.16PCh. 8 - Prob. 8.17PCh. 8 - Prob. 8.18PCh. 8 - Prob. 8.19PCh. 8 - Prob. 8.20PCh. 8 - Prob. 8.21PCh. 8 - Prob. 8.22PCh. 8 - Prob. 8.23PCh. 8 - Prob. 8.24PCh. 8 - Prob. 8.25PCh. 8 - Prob. 8.26PCh. 8 - Prob. 8.27PCh. 8 - Prob. 8.28PCh. 8 - Prob. 8.29PCh. 8 - Prob. 8.30PCh. 8 - Prob. 8.31PCh. 8 - Prob. 8.32PCh. 8 - Prob. 8.33PCh. 8 - Prob. 8.34PCh. 8 - Prob. 8.35PCh. 8 - Prob. 8.36PCh. 8 - Prob. 8.37PCh. 8 - Prob. 8.38PCh. 8 - Prob. 8.39PCh. 8 - Prob. 8.40PCh. 8 - Prob. 8.41PCh. 8 - Prob. 8.42PCh. 8 - Prob. 8.43PCh. 8 - Prob. 8.44PCh. 8 - Prob. 8.45PCh. 8 - Prob. 8.46PCh. 8 - Prob. 8.47PCh. 8 - Prob. 8.48PCh. 8 - Prob. 8.49PCh. 8 - Prob. 8.50PCh. 8 - Prob. 8.51PCh. 8 - Prob. 8.52PCh. 8 - Prob. 8.53PCh. 8 - Prob. 8.54PCh. 8 - Prob. 8.55PCh. 8 - Prob. 8.56PCh. 8 - Prob. 8.57PCh. 8 - Prob. 8.58PCh. 8 - Prob. 8.59PCh. 8 - Prob. 8.60PCh. 8 - Prob. 8.61PCh. 8 - Prob. 8.62PCh. 8 - Prob. 8.63PCh. 8 - Prob. 8.64PCh. 8 - Prob. 8.65PCh. 8 - Prob. 8.66PCh. 8 - Prob. 8.67PCh. 8 - Prob. 8.68PCh. 8 - Prob. 8.69PCh. 8 - Prob. 8.70PCh. 8 - Prob. 8.71PCh. 8 - Prob. 8.72PCh. 8 - Prob. 8.73PCh. 8 - Prob. 8.74PCh. 8 - Prob. 8.75PCh. 8 - Prob. 8.76PCh. 8 - Prob. 8.77PCh. 8 - Prob. 8.78PCh. 8 - Prob. 8.79PCh. 8 - Prob. 8.80PCh. 8 - Prob. 8.81PCh. 8 - Prob. 8.82PCh. 8 - Prob. 8.83PCh. 8 - Prob. 8.84PCh. 8 - Prob. 8.85PCh. 8 - Prob. 8.86PCh. 8 - Prob. 8.87DPCh. 8 - Prob. 8.88DPCh. 8 - Prob. 8.89DPCh. 8 - Prob. 8.90CPCh. 8 - Prob. K8.1KP
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