Question: The diffusivity of C in -ferrite (BCC iron) and diffusivity of C in y-austenite (FCC iron) is given at two temperatures: Diffusivity [m/s] Temperature

The diffusivity of C in -ferrite (BCC iron) and diffusivity of C

The diffusivity of C in -ferrite (BCC iron) and diffusivity of C in y-austenite (FCC iron) is given at two temperatures: Diffusivity [m/s] Temperature [C] Diffusivity [m/s] C in y-Fe 500 --- 900 1100 Answer the following: (2 marks each) 5.9 x 10-12 5.3 x 10-11 a) Calculate the activation energy of diffusion for C in -Fe. b) Calculate the activation energy of diffusion for C in y-Fe. C in -Fe 2.4 x 10 -12 1.7 x 10-10 c) Explain why the diffusivity of C in -Fe is higher than the diffusivity of C in y-Fe.

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Mechanical Engineering Questions!

9. Se utiliza para determinar el valor que tenga la mayor frecuencia en el grupo de datos a. Media b. Mediana c. Moda d. Rango

CANMNMM January of this year. (a) Each item will be held in a record. Describe all the data structures that must refer to these records to implement the required functionality. Describe all the...

Give Correct ANSWERS Human-Computer Interaction (a) If you had been one of the original inventors of the WIMP interface, and engineers on the technical team had been sceptical about the advantages...

- - Given Values - - Concentration of Nitrogen ( w t % ) : = 0 . 3 5 Position in m m = 2 . 6 Diffusion Coefficient for Nitrogen in Iron at 7 0 0 C = 9 . 1 0 E - 1 0 Nitrogen in Iron Heat Treatment...

Show me the steps to solve Homework Problem HW 6 _ 2 Tabulation of Error Function Values \ table [ [ z , erf ( z ) , z , erf ( z ) , z , erf ( z ) ] , [ 0 , 0 , 0 . 5 5 , 0 . 5 6 3 3 , 1 . 3 , 0 . 9...

During the stress relaxation: polymers remain under a fixed strain. Using the definition of the Relaxation Time constant; "a material property that defines the time needed for the instantaneous...

RATES OF DIFFUSION Metals are often treated to make them stronger and therefore wear longer. One problem with making a strong piece of metal is that it becomes difficult to form it into a desired...

Consider a microalloyed steel whose structure consists of a ferrite ( BCC iron ) matrix containing 0 . 2 % ( volume percent ) niobium carbide ( NbC ) particles. The carbide particles are spherical...

Given the diffusivity DC = 10 10 m 2 /s for interstitial carbon in bcc iron at 800 C of a= = 103 S-) 2.87 , estimate the activation energy A Gm for hopping of the C atoms (v= via interstitial sites.

9. (10 Pts) In the figure below the temperature dependence of diffusivity of Carbon and Aluminum in iron and aluminum is described. Answer the following questions: a. Why does diffusivity of carbon...

What do you see as the two most important current trends/issues being discussed in the current scholarly literature regarding strategic decision making? Why are these important to organizational...

Human blood behaves as a Newtonian fluid (see Prob. 20.51) in the high shear rate region where > 100. In the low shear rate region where

What type of leverage occurs when the loan interest rate is lower than the capitalization rate?

How can geo coded locations assist in better decision making?

How does traditional analytics make use of location-based data?

Georges Hamburgers issued 8%, 10-year bonds payable at 80 on December 31, 2016. At December 31, 2018, George reported the bonds payable as follows: George pays semiannual interest each June 30 and...

On June 30, Daughtry Limited issues 8%, 20-year bonds payable with a face value of $130,000. The bonds are issued at 86 and pay interest on June 30 and December 31. Requirements 1. Journalize the...

Consider the following note payable transactions of Caldwell Video Productions. 2016 Apr. 1 Purchased equipment costing $56,000 by issuing a seven-year, 13% note payable. The note requires annual...

Design a minimum-mass symmetric three-bar truss (the area of member 1 and that of member 3 are the same) to support a load P, as was shown in Fig. 2.9. The following notation may be used: Pu = P cos...

IfX and Y are independent gamma random variables with parameters (, ) and (, ), respectively, compute the joint density of U = X + Y and V = X/(X + Y).

The joint density function of X,Y is (a) Verify that the preceding is a joint density function. (b) Find Cov (X,Y). f(x, y) = e-(y+x/y), 0

At a party N men throw their hats into the center of a room. The hats are mixed up and each man randomly selects one. Find the expected number of men who select their own hats.