HomeworkLib
Question

Ab-10. Match the proper description of the microstructure depicted below. Put the corresponding letter in the box beneath the
science   Earth-Sciences   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

Answers:

First diagram corresponds to B: A binary-eutectic material with a composition greater than the solid solubility limit at room temperature but less than the solid solubility limit at the surface temperature. Explanation: Here, phase \beta nucleates as \alpha solid solubility is exceeded at solvus line.

Second diagram corresponds to E: A binary-eutectic material with a eutectic composition. Explanation: The layers \alpha and \beta are eutectic layers which form this very eutectic structure after crossing eutectic isotherm.

Third diagram corresponds to F: The eutectoid composition of steel below the eutectoid temperature. Explanation: Here slow cooling forms perlite, which is a layered structure of two phases \alpha-ferrite and cementite (Fe3C).

Fourth diagram corresponds to I: A hypo-eutectoid composition of steel below the eutectoid temperature. Explanation: Here, the composition is proeutectic \alpha and perlite.

Fifth diagram corresponds to G: A hyper-eutectoid composition of steel above the eutectoid temperature, but below the solid solubility limit of carbon in austenite. Explanation: It contains proeutectic cementite and austenite.

0 0
Add a comment
Know the answer?
Add Answer to:
Ab-10. Match the proper description of the microstructure depicted below. Put the corresponding letter in the...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • please answer question 2,3,4 ​​​​​​​ A critical feature of steel is that a considerable amount of...

    please answer question 2,3,4 ​​​​​​​ A critical feature of steel is that a considerable amount of carbon can be dissolved in the austenite, phase, (up to 2.14 w/o at 1147"C), whereas carbon is essentially insoluble in ferrite, Cooling from point d to e, just above the eutectoid but still in the an increased fraction of the +y region, will produce phase and a microstructure similar to that shown: the particles precinitates out in the form af an intermetallic.compound called iron-carbide...

  • In the diagram below, what is the eutectic temperature and what is the eutectoid temperature of...

    In the diagram below, what is the eutectic temperature and what is the eutectoid temperature of steel? A. eutectic temperature: 1539°C, eutectoid temperature: 723°C. B. eutectic temperature: 723°C, eutectoid temperature: 1539°C. C. eutectic temperature: 723°C, eutectoid temperature: 1130°C. D. eutectic temperature: 1130°C, eutectoid temperature: 723°C. In the diagram below, what is the eutectic composition and what is the eutectoid composition of steel? A. eutectic composition: 4.3 wt% C, eutectoid composition: 0.83 wt% C. B. eutectic composition: 0.83 wt% C, eutectoid...

  • 1.Give examples of ionic, covalent and metallic bonds. Relate the bond type to regions of the...

    1.Give examples of ionic, covalent and metallic bonds. Relate the bond type to regions of the periodic table. Describe some secondary bond types. 2. Draw the iron carbon phase diagram. Label all the phase regions. Indicate a eutectic reaction, a eutectoid reaction and a peritectic reaction. Indicate the structure of a steel containing 0.4%C at 950C, when cooled slowly to 800C, and finally cooled to 600C. Is this steel a hypo or hyper euectoid? 3. Draw a phase diagram from...

  • Question 3 (1) Sketch the microstructures (at temperature just below eutectold temperature) of slow-cooled pure Iron...

    Question 3 (1) Sketch the microstructures (at temperature just below eutectold temperature) of slow-cooled pure Iron (Owt%C) and steels with 0.3wt%C, and 0.76wt%C, and explain how the structures develop on cooling from 1100°C to room temperature (Figure 3.1 for Fe-Fe,c phase diagram, see below). (18marks] 1600 Composition Cat C) 10 is 20 25 1538"C 149346 1400 1394°C 2500 72 1200 1147°C > Austenite 2.14 4.30 Temperature) 2000 1000 Temperature (°F) 912°C y + Fe3c 800 1500 0.76 727°C 600 0.022...

  • Round to the nearest 5%--no need for something like 43.2...that would become 45. If there's none of that phase form...

    Round to the nearest 5%--no need for something like 43.2...that would become 45. If there's none of that phase formed, enter a 0 (zero). If it looks close enough then it is 800 1400 Eutectoid temperature 700 1200 1000 500 800 400 600 300 M(start) 200 400 M + A M( 5096) M19096) 100 10 102 03 104105 Time (s) Using the above TTT diagram for the eutectoid composition of steel, enter the relative amount of each microstructure formed for...

  • 15. From the iron-carbon phase diagram (see Figure below) a. What are the concentrations of carbon...

    15. From the iron-carbon phase diagram (see Figure below) a. What are the concentrations of carbon in each a-ferrite and Fe3C at a temperature just below 727°C? b. What are the phases involved in the eutectoid reaction? c. I am making a hyper-eutectoid steel with 2 wt%C. If I cool slowly from 1400°C, what phases and microstructure will I have at room temperature, assuming only equilibrium phases can be present? d. What is the euctectoid composition for Fe-C system shown...

  • Sketch the aluminum-silicon phase diagram from the following data to estimate the proportion of pure silicon in the eutectic alloy just below the eutectic temperature and sketch the possible microstructure.

     • It is a eutectic system. • The melting point of pure aluminum is 6600C • The melting point of silicon is 1410 0C • The eutectic temperature is 5800C • Aluminum is insoluble in silicon • The eutectic composition is 85% Al + 15% Si • The Al-rich phase (α) is a solid solution of Si in Al and the maximum solubility of Si in α is 3% at the eutectic temperature • At 500°C the solubility of Si in α has fallen to 0% and...

  • The phase diagram for the iron-carbon Fe-C system is shown below. use it to answer the...

    The phase diagram for the iron-carbon Fe-C system is shown below. use it to answer the following questions a) How many different solid allotropes (phases) does pure iron have? b) what is the maximum carbon solubility of carbon in austentite? c) what is the maximum carbon solubility of carbon in ferrite? d)On cooling the following phase reaction occurs at 0.76% C and 727*c y--> alpha + Fe3C. On cooling what phase reaction occurs at .16% C and 1493*c? e)For a...

  • 800 A 1400 Eutectoid temperature 700 A 1200 P 600 1000 500 A 800 400 A 600 300 M(start) 50% 400 200 M+ A M(50%) M(...

    800 A 1400 Eutectoid temperature 700 A 1200 P 600 1000 500 A 800 400 A 600 300 M(start) 50% 400 200 M+ A M(50%) M(90%) 100 200 105 102 103 104 10-1 10 1 Time (s) Temperature (°C) Temperature (°F) Using the above TTT diagram for the eutectoid composition of steel, enter the relative amount of each microstructure formed for the following heat treatment in the boxes below. Rapidly cool to 625°C, hold for 10s, rapidly cool to 450°C,...

  • PROBLEM 11 (10 pts) Consider the phase diagram shown below. Be precise when you read the...

    PROBLEM 11 (10 pts) Consider the phase diagram shown below. Be precise when you read the phase diagram. (a) (5 pts) Consider Fe - 1.9 wt% C steel at a temperature just below the eutectoid temperature. Determine the relative amount of the pearlite. Write the Lever rule expression used clearly. (b) (5 pts) Consider Fe - 0.6 wt% C steel at a temperature just below the eutectoid temperature. Determine the relative amount of the pearlite. Write the Lever rule expression...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT