Homework Answers
Microstructural refinement of AISI 1018 steel is achieved by alloying or thermomechanical treatments. Severe plastic deformation technics require high strain rate for achieving ultrafined grain. So cyrorolling is the best practice of producing ultrafined grain which require only lower load to achieve severe strain. In cyrorolling steel is soaked in liquid nitrogen. During soaking the material cools and atomic contraction of matrix occured due to high cold. It releases high compressive deformation energy, it acts as the driving potential for enhancement and movement of dislocation during cyrorolling.
The resulting microstructure is of ferrite and pearlite. The grain increases due to annealing temperature fall in the grain growth region.
So the microstructure becomes ultrafine grain (UFG) on cooling the 1018 steel bar
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4. How do you expect the microstructure of the annealed 1018 steel bars to vary with...
5. Obtain a rough approximation for the modulus of toughness for annealed AISI 1018, and describe what it means 6....
5. Obtain a rough approximation for the modulus of toughness for annealed AISI 1018, and describe what it means 6. Annealed 304 Stainless Steel is given 10% cold work. Determine the new values of yield strength and ultimate strength. Comment on how the cold work has affected the material 7, Repeat question 6 but for 40% cold work.
5. Obtain a rough approximation for the modulus of toughness for annealed AISI 1018, and describe what it means 6. Annealed 304...
For tensile testing, six 1018 steel tensile bars were homogenized at 950°C and then each was...
For tensile testing,
six 1018 steel tensile bars were homogenized at 950°C and then each
was subjected to one of the following heat treatments:
water quenching (WQ)
water quenching followed by a 1 hour anneal at 300°C (WQ +
300)
water quenching followed by a 1 hour anneal at 500°C (WQ +
500)
Oil quenching (OQ)
Air cooling (AC)
Furnace cooling (FC)
Carbon Steels: 1019 °C A 800 A A+F 700 6001 A+F+P F+P 500 -Ms TEMPERATURE 400E Mgo M90...
An aircraft part made from annealed AISI 1018 steel undergoes a 19 percent cold-work operation. Obtain...
An aircraft part made from annealed AISI 1018 steel undergoes a 19 percent cold-work operation. Obtain the yield strength (KSI) after the cold work operation (Use one decimal place on your answer).
6. Plot the stress-strain response that you would expect to see if a specimen of annealed...
6. Plot the stress-strain response that you would expect to see if a specimen of annealed mild steel is subject to uniaxial tension. Indicate the following features on the graph that you draw i). Yield strength ii). Tensile strength iii). Failure strength iv). Failure strain. A sample of the same mild steel was then subject to cold-rolling to produce a 5% reduction in thickness and a second test specimen cut from t. What would the stress-strain response of this deformed...
4.) a.) What is the cooling rate from 800°C to 500°C for a steel part with 20 % bainite? Method of MCQuoid-Ehn 9%V b.S.-M 10.43 0.41 082 0041 0.015 1.22 004 0.14 0.11 Austenitizing temp. - 880°C Grai...
4.) a.) What is the cooling rate from 800°C to 500°C for a steel part with 20 % bainite? Method of MCQuoid-Ehn 9%V b.S.-M 10.43 0.41 082 0041 0.015 1.22 004 0.14 0.11 Austenitizing temp. - 880°C Grain size (AS 10-11 800 Acs (0.25° min) 700 600 500 Hardness HR 200 90 100 104 10 60 102 min 1 2 468 1624 1 2 34 6 10 b.) What is the room temperature hardness of this steel part? c.) Which...
Pre-Lab Questions: 1. How do you expect the Prime Mover speed to vary with the input...
Pre-Lab Questions: 1. How do you expect the Prime Mover speed to vary with the input voltage? 2. What does a negative speed reading on the Prime Mover indicate? 3. If the Prime Mover is rotating counter-clockwise ... Will the Top be positive or negative? 4. The Troo when the Prime Mover is mechanically coupled to another rotating machine is greater than the Teco when it is not connected to another machine. What are the sources of this additional torque?
Question 2 (20 pts): Charpy V-notch test was performed for different steel specimens. Please answer the...
Question 2 (20 pts): Charpy V-notch test was performed for different steel specimens. Please answer the following questions briefly. a) (3) As the temperature becomes lower, the metals usually experience a transition from ductile fracture to brittle fracture at a certain temperature. This temperature is called: b) (6) The graph below shows the test results for annealed 1018 steel and annealed 1045 steel. Please label the curves with relevant steel (1018 or 1045) and briefly explain your reason. 1018 AND...
Question 2 (20 pts): Charpy V-notch test was performed for different steel specimens. Please answer the...
Question 2 (20 pts): Charpy V-notch test was performed for different steel specimens. Please answer the following questions briefly. a) (3) As the temperature becomes lower, the metals usually experience a transition from ductile fracture to brittle fracture at a certain temperature. This temperature is called: b) (6) The graph below shows the test results for annealed 1018 steel and annealed 1045 steel. Please label the curves with relevant steel (1018 or 1045) and briefly explain your reason. 1018 AND...
4- A steel strip of thickness 6-12 mm is annealed by passing it through a large fumace whose wall...
4- A steel strip of thickness 6-12 mm is annealed by passing it through a large fumace whose walls are maintained at a temperature Tw corresponding to that of combustion gases flowing through the fumace (Iw Tp). The stip, whose density, spcific thermal conductivity, and emissivity are 79 kg/m3, cp -640 J/kg K, k 30 W/m K and 0.7, respectively, is to be heated from 300°C to 600°C Furnace walls, Combustion gases For a unifom convection coefficient of h-100 W/m2...
Steel is sequentially heated and cooled (annealed) to relieve stresses and to make it less brittle....
Steel is sequentially heated and cooled (annealed) to relieve stresses and to make it less brittle. Consider a 100-mm-thick plate (k = 45 W/m.K, p= 7800 kg/m3, cp = 500 J/kg.K) that is initially at a uniform temperature of 180°C and is heated (on both sides) in a gas-fired furnace for which T. = 700°C and h= 500 W/m2.K. How long will it take for a minimum temperature of 550°C to be reached in the plate? sec. It will take...
5. Obtain a rough approximation for the modulus of toughness for annealed AISI 1018, and describe what it means 6. Annealed 304 Stainless Steel is given 10% cold work. Determine the new values of yield strength and ultimate strength. Comment on how the cold work has affected the material 7, Repeat question 6 but for 40% cold work.
5. Obtain a rough approximation for the modulus of toughness for annealed AISI 1018, and describe what it means 6. Annealed 304...
For tensile testing,
six 1018 steel tensile bars were homogenized at 950°C and then each
was subjected to one of the following heat treatments:
water quenching (WQ)
water quenching followed by a 1 hour anneal at 300°C (WQ +
300)
water quenching followed by a 1 hour anneal at 500°C (WQ +
500)
Oil quenching (OQ)
Air cooling (AC)
Furnace cooling (FC)
Carbon Steels: 1019 °C A 800 A A+F 700 6001 A+F+P F+P 500 -Ms TEMPERATURE 400E Mgo M90...
6. Plot the stress-strain response that you would expect to see if a specimen of annealed mild steel is subject to uniaxial tension. Indicate the following features on the graph that you draw i). Yield strength ii). Tensile strength iii). Failure strength iv). Failure strain. A sample of the same mild steel was then subject to cold-rolling to produce a 5% reduction in thickness and a second test specimen cut from t. What would the stress-strain response of this deformed...
4.) a.) What is the cooling rate from 800°C to 500°C for a steel part with 20 % bainite? Method of MCQuoid-Ehn 9%V b.S.-M 10.43 0.41 082 0041 0.015 1.22 004 0.14 0.11 Austenitizing temp. - 880°C Grain size (AS 10-11 800 Acs (0.25° min) 700 600 500 Hardness HR 200 90 100 104 10 60 102 min 1 2 468 1624 1 2 34 6 10 b.) What is the room temperature hardness of this steel part? c.) Which...
Pre-Lab Questions: 1. How do you expect the Prime Mover speed to vary with the input voltage? 2. What does a negative speed reading on the Prime Mover indicate? 3. If the Prime Mover is rotating counter-clockwise ... Will the Top be positive or negative? 4. The Troo when the Prime Mover is mechanically coupled to another rotating machine is greater than the Teco when it is not connected to another machine. What are the sources of this additional torque?
Question 2 (20 pts): Charpy V-notch test was performed for different steel specimens. Please answer the following questions briefly. a) (3) As the temperature becomes lower, the metals usually experience a transition from ductile fracture to brittle fracture at a certain temperature. This temperature is called: b) (6) The graph below shows the test results for annealed 1018 steel and annealed 1045 steel. Please label the curves with relevant steel (1018 or 1045) and briefly explain your reason. 1018 AND...
Question 2 (20 pts): Charpy V-notch test was performed for different steel specimens. Please answer the following questions briefly. a) (3) As the temperature becomes lower, the metals usually experience a transition from ductile fracture to brittle fracture at a certain temperature. This temperature is called: b) (6) The graph below shows the test results for annealed 1018 steel and annealed 1045 steel. Please label the curves with relevant steel (1018 or 1045) and briefly explain your reason. 1018 AND...
4- A steel strip of thickness 6-12 mm is annealed by passing it through a large fumace whose walls are maintained at a temperature Tw corresponding to that of combustion gases flowing through the fumace (Iw Tp). The stip, whose density, spcific thermal conductivity, and emissivity are 79 kg/m3, cp -640 J/kg K, k 30 W/m K and 0.7, respectively, is to be heated from 300°C to 600°C Furnace walls, Combustion gases For a unifom convection coefficient of h-100 W/m2...
Steel is sequentially heated and cooled (annealed) to relieve stresses and to make it less brittle. Consider a 100-mm-thick plate (k = 45 W/m.K, p= 7800 kg/m3, cp = 500 J/kg.K) that is initially at a uniform temperature of 180°C and is heated (on both sides) in a gas-fired furnace for which T. = 700°C and h= 500 W/m2.K. How long will it take for a minimum temperature of 550°C to be reached in the plate? sec. It will take...
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