Homework Answers
Hi,
The correct answer to the problem is Option A Iron and Carbon.
Then reason being steel is made by combining iron and carbon, as when carbon is added to iron in small quantities then steel is obtained so therfore the two phases which are present are Iron and Carbon .
The various terms are explanied below
Ferrite : It is virtually pure iron with (bcc) body centered cubic crystal structure . Stable at all temperatures upto 9373K. The carbon solubility in ferrite depends upon the temperature ,the maximum being 0.02% at 996K.
Iron carbide (Fe3C) or cementite is a compound iron and carbon containing 6.67% carbon by weight.
Pearlite: It is a fine mixture of cementite and ferrite arranged in lamellar form. It is stable at all temperatures below 996 K.
Austenite is a (fcc) face centred cubic structure. It is stable at temperatures above 996K depending upon carbon content. It can dissolve upto 2% carbon.
All of the above lie on the iron- carbon phase diagram.
Thank You/
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Add Answer to:
"Steels" are generally two-phase systems of what two phases? Iron and carbon O Iron and cementite...
Which of the following represent the two-phase microstructure found in some steels and cast irons that...
Which of the following represent the two-phase microstructure found in some steels and cast irons that result from the transformation of austenite with the eutectoid composition and consist of alternating layers called lamellae? Select all that apply. G+ Primary ferrite + cementite Pearlite Ferrite + cementite Proeutectoid cementite + austenite Proeutectoid ferrite + austenite a + Fe3C O 7+ Fe3C
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...
7. A hypereutectoid steel contains 0.8% C. When slow cooled from austenite the following transformation products...
7. A hypereutectoid steel contains 0.8% C. When slow cooled from austenite the following transformation products result. a) ferrite and bainite b) ferrite and martensite c) ferrite and pearlite d) pearlite and cementite 8. Pearlite is a combination of a) cementite and iron carbide b) ferrite and cementite c) ferrite and bainite d) ferrite and martensite 9. The process of hardening steel consists of what two steps? a) melting the steel followed by quenching b) melting the steel followed by...
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...
Multiple choice The iron carbide (Fe 3C) phase in steel that is hard and brittle is...
Multiple choice The iron carbide (Fe 3C) phase in steel that is hard and brittle is known as: Austenite, ferrite, cementite, martensite -------is a shape produced by solidification of a liquid metal (material) in a mold. cupola, drag, casting, forming ------- is a phase in steel composed of alternating layers of cementite and ferrite. pearlite, lattice, Fe3C, martensite Steel is an alloy of carbon and iron with limits on the amounts of carbon to be approximately: more than 1%, less...
The microstructure of an iron-carbon alloy consists of proeutectoid cementite and pearlite; the mass fractions of...
The microstructure of an iron-carbon alloy consists of proeutectoid cementite and pearlite; the mass fractions of these microconstituents are 0.12 and 0.88, respectively. Determine the concentration of carbon in this alloy. The iron-iron carbide phase diagram is shown in the Animated Figure 9.24. wt%C Composition = 0 wt% C Composition = 0 at% C Temperature = 400 °C Temperature = 752 F 2025 Composition (at% C) 10 15 160025 1600 97538 9493 °C 1400 1400 2500 | 1394 °C y+L...
With the aid of clear sketches, highlight two major difference between homogeneous and heterogeneous nucleation. b)...
With the aid of clear sketches, highlight two major difference between homogeneous and heterogeneous nucleation. b) The iron–iron carbide eutectoid reaction is and is fundamental to the development of microstructure in steel alloys. On cooling, austenite, with an intermediate carbon content, transforms to a ferrite phase, having a much lower carbon content, and also cementite, with much higher carbon. Figure 4.1 is a temperature-timetransformation (TTT) diagram for the said process at 675℃. i. Determine how long it takes for austenite...
2. The mass fractions of ferrite and cementite in an iron-carbon alloy are 0.88 and 0.12,...
2. The mass fractions of ferrite and cementite in an iron-carbon alloy are 0.88 and 0.12, respectively, at 7270C. Note that the solubility of carbon in ferrite is 0.026 wt% at 7270C. Using the Fe-C phase diagram in Part A, determine whether this alloy is hypoeutectoid or hypereutectoid.
By referring to the iron-iron carbide phase diagram given below, answer the questions that follow. Competens...
By referring to the iron-iron carbide phase diagram given below, answer the questions that follow. Competens 1000 10 -14970 20 1.400 1.200 1307C Top Die 1500 7270 0.76 0.020 le Care 1000 400 0 Dompet Iron-Iron Carbide Phase Diagram (from Textbook) (a) Give the temperature and composition (carbon wel) corresponding to: (i) the cutectic point, and (ii) the cutectoid point (2 points) (b) Descnbe the structural changes that take place when a 1.0 wtf carbon steel is slowly cooled from...
4. (12 marks) This question pertains to the iron-iron carbide phase dingrane below 1%)() 2.11 43...
4. (12 marks) This question pertains to the iron-iron carbide phase dingrane below 1%)() 2.11 43 Ai 0.77 727"C 6.67 500 0.0218 Fe,C Weight percent carborn For a Fe-0.6 wt% C alloy at temperature just below the eutectoid. (a) calculate the fractions of total ferrite and cementite phases b) Calculate fractions of the proeutectoid ferrite and pearlite.
Which of the following represent the two-phase microstructure found in some steels and cast irons that result from the transformation of austenite with the eutectoid composition and consist of alternating layers called lamellae? Select all that apply. G+ Primary ferrite + cementite Pearlite Ferrite + cementite Proeutectoid cementite + austenite Proeutectoid ferrite + austenite a + Fe3C O 7+ Fe3C
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...
7. A hypereutectoid steel contains 0.8% C. When slow cooled from austenite the following transformation products result. a) ferrite and bainite b) ferrite and martensite c) ferrite and pearlite d) pearlite and cementite 8. Pearlite is a combination of a) cementite and iron carbide b) ferrite and cementite c) ferrite and bainite d) ferrite and martensite 9. The process of hardening steel consists of what two steps? a) melting the steel followed by quenching b) melting the steel followed by...
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...
The microstructure of an iron-carbon alloy consists of proeutectoid cementite and pearlite; the mass fractions of these microconstituents are 0.12 and 0.88, respectively. Determine the concentration of carbon in this alloy. The iron-iron carbide phase diagram is shown in the Animated Figure 9.24. wt%C Composition = 0 wt% C Composition = 0 at% C Temperature = 400 °C Temperature = 752 F 2025 Composition (at% C) 10 15 160025 1600 97538 9493 °C 1400 1400 2500 | 1394 °C y+L...
2. The mass fractions of ferrite and cementite in an iron-carbon alloy are 0.88 and 0.12, respectively, at 7270C. Note that the solubility of carbon in ferrite is 0.026 wt% at 7270C. Using the Fe-C phase diagram in Part A, determine whether this alloy is hypoeutectoid or hypereutectoid.
By referring to the iron-iron carbide phase diagram given below, answer the questions that follow. Competens 1000 10 -14970 20 1.400 1.200 1307C Top Die 1500 7270 0.76 0.020 le Care 1000 400 0 Dompet Iron-Iron Carbide Phase Diagram (from Textbook) (a) Give the temperature and composition (carbon wel) corresponding to: (i) the cutectic point, and (ii) the cutectoid point (2 points) (b) Descnbe the structural changes that take place when a 1.0 wtf carbon steel is slowly cooled from...
4. (12 marks) This question pertains to the iron-iron carbide phase dingrane below 1%)() 2.11 43 Ai 0.77 727"C 6.67 500 0.0218 Fe,C Weight percent carborn For a Fe-0.6 wt% C alloy at temperature just below the eutectoid. (a) calculate the fractions of total ferrite and cementite phases b) Calculate fractions of the proeutectoid ferrite and pearlite.
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