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Distinguish between the following three types of plain-carbon steels: a) eutectoid b) hypereutectoid, and c) hypereutectoid....
State the composition Fe and C of plain carbon eutectoid steel. Determine wt% for: α ferrite,...
State the composition Fe and C of plain carbon eutectoid steel. Determine wt% for: α ferrite, Fe3C cementite, assume equilibrium cooling process.
1. a. Distinguish between mechanical fatigue, thermomechanical fatigue, thermal fatigue and corrosion fatigue. b. Differentiate between...
1. a. Distinguish between mechanical fatigue, thermomechanical fatigue, thermal fatigue and corrosion fatigue. b. Differentiate between the S-N curves of plain carbon steels and aluminum alloys. c. Why is it important to have a smooth surface on a sample used for rotating beam fatigue test? d. State four ways to increase the fatigue life of a component.
Given a plain carbon steel which has 8 % primary (or pro eutectoid) carbide, determine both...
Given a plain carbon steel which has 8 % primary (or pro
eutectoid) carbide, determine both overall carbon content and
ferrite content. Assume that the steel was at equilibrium just
above the eutectoid temperature and then cooled immediately to
600ºC and held for 5 seconds, then quenched. What microconstituents
would there be in the structure and how much of each? (Assume the
cooling behavior follows the TTT curve shown)
800 Eutectoid temperature 1400 700 А 1200 600 1000 500 B...
8. For a material with a melting point of 960°C. We expect that recrystallization will occur...
8. For a material with a melting point of 960°C. We expect that recrystallization will occur at temperatures (in °C) in the range of: In a plain steel that contains 0.2 percentage carbon, we should expect: A ()a eutectoid steel. B( )a hypereutectoid steel C ( ) a 25% pearlite and 75% pro-eutectoid ferrite D ( ) a 75% pearlite and 25% pro-eutectoid ferrite
Ou. 3 Chapters 10- 11: Phase Transformations/ Designations, Compositions and Typ Applications for Some Selected Steels (25%) Using the isothermal transformation diagram for an iron-carbon alloy o...
Ou. 3 Chapters 10- 11: Phase Transformations/ Designations, Compositions and Typ Applications for Some Selected Steels (25%) Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition 6), please, identify and name the final microstructures resulting from the two cooling curves labeled (@) and (b). (c): Draw and label on Figure 6 the cooling curve that yields the following microstructures: 50% of microstructure A (Figure 7a) and 50% of microstructure B (Figure 7b). (d) Please, provide missing information...
this is the TTT curve Given a plain carbon steel which has 8 % primary (or...
this is the TTT curve
Given a plain carbon steel which has 8 % primary (or pro eutectoid) carbide, determine both overall carbon content and ferrite content. a. Assume that the steel was at equilibrium just above the eutectoid temperature and then cooled immediately to 600°C and held for 5 seconds, then quenched. What microconstituents would there be in the structure and how much of each? (Assume the cooling behavior follows the TTT curve shown) 800 А Eutectoid temperature 1400...
QUESTION 6 (5+5+5+5 = 20 marks) Microalloyed steels are an important class of steels used extensively...
QUESTION 6 (5+5+5+5 = 20 marks) Microalloyed steels are an important class of steels used extensively by the automotive industry. The two most important contributions to the yield strength of these alloys are the strengthening by precipitates in the form of alloy carbides and the strengthening by ferrite grain size refinement. Consider a typical Nb microalloyed alloy composition: Fe-0.1C-1Mn-0.1Nb (wt. %). These alloys are hot rolled in the austenitic condition and then air cooled from elevated temperature. Figure 1 below...
please answer all questions clearly. thank you 3. In the steels below calculate the carbon content...
please answer all questions clearly. thank you
3. In the steels below calculate the carbon content and comment whether the steel is hypo- or hyper- eutectoid. (a) Steel 1, containing 8% cementite and 92% ferrite at room temperature (b) Steel 3 containing 18% cementite and 82% ferrite at room temperature (c) Steel 3 containing i 8% pearlite and 82% proeutectoid ferrite at room temperature (d) Steel 4 containing 94% pearlite and 6% proeutectoid cementite at room temperature
PLEASE HELP WITH ALL QUESTIONS QUESTION 1 Distinguish or explain the difference between the following: 1.1...
PLEASE HELP WITH ALL QUESTIONS
QUESTION 1 Distinguish or explain the difference between the following: 1.1 Primary and secondary growth 1.2 Heartwood and sapwood 1.3 Simple and multiple fruits 1.4 Bottleneck effect and genetic effect QUESTION 2 2.1 Distinguish between annual, biennial and perennial plants. 2.2 Provide THREE examples of ways that humans use roots. 2.3 Is the following structures a root, stem or leaf and what is its function? a. Haustoria b. Rhizome c. Stipule spine (3 x 2...
Problem 3 (20 pts): Using the phase diagram and isothermal transformation diagram for an iron- carbon alloy of eutectoid composition. Assuming that the specimen begins at 760-C and that it has...
Problem 3 (20 pts): Using the phase diagram and isothermal transformation diagram for an iron- carbon alloy of eutectoid composition. Assuming that the specimen begins at 760-C and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure, answer the following questions: 1400 Eutectoid temerabre 1000 800 400 600 300 400 200 MC90%) 100 200 Time (s) We were unable to transcribe this image
Problem 3 (20 pts): Using the phase...
Given a plain carbon steel which has 8 % primary (or pro
eutectoid) carbide, determine both overall carbon content and
ferrite content. Assume that the steel was at equilibrium just
above the eutectoid temperature and then cooled immediately to
600ºC and held for 5 seconds, then quenched. What microconstituents
would there be in the structure and how much of each? (Assume the
cooling behavior follows the TTT curve shown)
800 Eutectoid temperature 1400 700 А 1200 600 1000 500 B...
8. For a material with a melting point of 960°C. We expect that recrystallization will occur at temperatures (in °C) in the range of: In a plain steel that contains 0.2 percentage carbon, we should expect: A ()a eutectoid steel. B( )a hypereutectoid steel C ( ) a 25% pearlite and 75% pro-eutectoid ferrite D ( ) a 75% pearlite and 25% pro-eutectoid ferrite
Ou. 3 Chapters 10- 11: Phase Transformations/ Designations, Compositions and Typ Applications for Some Selected Steels (25%) Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition 6), please, identify and name the final microstructures resulting from the two cooling curves labeled (@) and (b). (c): Draw and label on Figure 6 the cooling curve that yields the following microstructures: 50% of microstructure A (Figure 7a) and 50% of microstructure B (Figure 7b). (d) Please, provide missing information...
this is the TTT curve
Given a plain carbon steel which has 8 % primary (or pro eutectoid) carbide, determine both overall carbon content and ferrite content. a. Assume that the steel was at equilibrium just above the eutectoid temperature and then cooled immediately to 600°C and held for 5 seconds, then quenched. What microconstituents would there be in the structure and how much of each? (Assume the cooling behavior follows the TTT curve shown) 800 А Eutectoid temperature 1400...
QUESTION 6 (5+5+5+5 = 20 marks) Microalloyed steels are an important class of steels used extensively by the automotive industry. The two most important contributions to the yield strength of these alloys are the strengthening by precipitates in the form of alloy carbides and the strengthening by ferrite grain size refinement. Consider a typical Nb microalloyed alloy composition: Fe-0.1C-1Mn-0.1Nb (wt. %). These alloys are hot rolled in the austenitic condition and then air cooled from elevated temperature. Figure 1 below...
please answer all questions clearly. thank you
3. In the steels below calculate the carbon content and comment whether the steel is hypo- or hyper- eutectoid. (a) Steel 1, containing 8% cementite and 92% ferrite at room temperature (b) Steel 3 containing 18% cementite and 82% ferrite at room temperature (c) Steel 3 containing i 8% pearlite and 82% proeutectoid ferrite at room temperature (d) Steel 4 containing 94% pearlite and 6% proeutectoid cementite at room temperature
PLEASE HELP WITH ALL QUESTIONS
QUESTION 1 Distinguish or explain the difference between the following: 1.1 Primary and secondary growth 1.2 Heartwood and sapwood 1.3 Simple and multiple fruits 1.4 Bottleneck effect and genetic effect QUESTION 2 2.1 Distinguish between annual, biennial and perennial plants. 2.2 Provide THREE examples of ways that humans use roots. 2.3 Is the following structures a root, stem or leaf and what is its function? a. Haustoria b. Rhizome c. Stipule spine (3 x 2...
Problem 3 (20 pts): Using the phase diagram and isothermal transformation diagram for an iron- carbon alloy of eutectoid composition. Assuming that the specimen begins at 760-C and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure, answer the following questions: 1400 Eutectoid temerabre 1000 800 400 600 300 400 200 MC90%) 100 200 Time (s) We were unable to transcribe this image
Problem 3 (20 pts): Using the phase...
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