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1. What temperature is required to obtain 0.50% C at a distance...
Material science 1) Polypropylene (PP) has a glass-transition temperature of -15 oC and a melting...
Material science 1) Polypropylene (PP) has a glass-transition temperature of -15 oC and a melting temperature of 175 oC. This means that at a temperature of -40 oC that PP is ________, and at temperature 0 oC PP is _________ . (A) brittle, brittle (B) ductile, brittle (C) brittle, ductile (D) ductile, ductile (E) low in thermal conductivity, high in thermal conductivity. .2) Galvanized steel corrodes slowly in air because: (A) the...
Material Science and Engineering: Question 2 is on Ferrous and Nonferrous Alloys and Question 6 is on Ceramics. The correct answers are posted but would like to know which equation is used. Please exp...
Material Science and Engineering: Question 2 is on Ferrous and
Nonferrous Alloys and Question 6 is on Ceramics. The correct
answers are posted but would like to know which equation is used.
Please explain. Thank you. I just figured out Question 6 so you do
not need to answer it but would be nice in case i missed the big
picture. I ONLY ask now is to solve for Question #2.
0/2 pts Question2 A plain carbon steel having a...
15. The resistance of an 8.3-m-long, 0.50-mm-diameter wire is 4.1 2. From what material is this...
15. The resistance of an 8.3-m-long, 0.50-mm-diameter wire is 4.1 2. From what material is this wire likely made? A. Copper B. Aluminum C. Iron D. Nichrome
3. For the carburization process in problem #2 above the surface carbon concentration is at 1.0...
3. For the carburization process in problem #2 above the surface carbon concentration is at 1.0 wt% C. The initial carbon concentration of the steel is 0.2 wt%. Calculate how long it will take at 10000C to reacha carbon concentration of 0.6 wt% at a distance of 1 mm from the surface. Assume this is a semi-infinite solid. region. The density of y-iron (FCC) at 1000°C is 7.63 g/cm3, Do = 20x106 m2/s; Q = 142,000 J/mol
Its a thermal treatment of metallic materials from material science questions QUESTION 9 a) Heat treatment...
Its a thermal treatment of metallic materials from
material science questions
QUESTION 9 a) Heat treatment schedule for three (3) thin samples of plain carbon steel containing different carbon concentration is summarized in Table Q9(a). Determine and sketch the resultant microstructure for each steel. Distinguish steel 1 from steel 3 with reference to their mechanical properties. Table 29(a) Steel wt% C Heating temperature Soaking time (°C) (minutes) Cooling process 1 0.5 950 60 Furnace cooled 2 0.8 800 60 Air...
s. (15 points) Four kilograms ) what temperature muistns of steel containing 0.50 wt% carbon is...
s. (15 points) Four kilograms ) what temperature muistns of steel containing 0.50 wt% carbon is to be heat treated. b) if slowly cooled from the Austenite phase, what jsrthe proeutectoid phase that is formed? c) how many kilograms of Pearlite will be in the steel when cooled to room temperature? d) compute the mass fractions 6t Péfrnite and Cemente in Peartite e) the microstructure of a different iron-carbon alloy consists of proeutectoid ferrite and pearlite. The containing 0.5 it...
Rapid cooling (thermal shock) of a thin layer of material causes a thermal shock stress. the thermal shock stress can b...
Rapid cooling (thermal shock) of a thin layer of material causes a thermal shock stress. the thermal shock stress can be estimated by Εα(ΔT) σ, - σ 1-v Assume that a piece of materials in the table below contains a crack of a depth a 0.5 mm, calculate the surface temperature change necessary to cause brittle fracture for each material [6 marks]. Rank the materials in thermal shock resistance from the largest to the least [2 marks] hint: Y-0.72 small...
Question 3 34 pts ro 1 ri = 0.05m A pipe with surface temperature T1 -...
Question 3 34 pts ro 1 ri = 0.05m A pipe with surface temperature T1 - 458 K is wrapped with 0.04 m of glass fiber pipe insulation. The outer surface temperature of the insulation, T2 is equal to 347 K and its emissivity is equal to 0.68. The insulation is also subject to natural convection with a bulk fluid temperature of 298 K and h = 4 W/m2-K. For a pipe length of 100 m, and assuming that the...
Question 2 You are working as a crime scene investigator and must predict the temperature of...
Question 2 You are working as a crime scene investigator and must predict the temperature of a homicide victim over a 5-hr period. You know that the room where the victim was found was at 10 "C when the body was discovered. Newton's law of cooling says that the temperature of a body changes at a rate proportional to the difference between its temperature and that of the surrounding medium (the ambient temperature), where T = the temperature of the...
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate...
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate per unit length of the tube due to free convection. 2) Air at -10°C flows at 10 m/s over the roof plate of two 5m length rooms whose air is at Too-200C. The roof plate is 0.20-m thick concrete (k = 0.6 w/ m. K)....
Material Science and Engineering: Question 2 is on Ferrous and
Nonferrous Alloys and Question 6 is on Ceramics. The correct
answers are posted but would like to know which equation is used.
Please explain. Thank you. I just figured out Question 6 so you do
not need to answer it but would be nice in case i missed the big
picture. I ONLY ask now is to solve for Question #2.
0/2 pts Question2 A plain carbon steel having a...
15. The resistance of an 8.3-m-long, 0.50-mm-diameter wire is 4.1 2. From what material is this wire likely made? A. Copper B. Aluminum C. Iron D. Nichrome
3. For the carburization process in problem #2 above the surface carbon concentration is at 1.0 wt% C. The initial carbon concentration of the steel is 0.2 wt%. Calculate how long it will take at 10000C to reacha carbon concentration of 0.6 wt% at a distance of 1 mm from the surface. Assume this is a semi-infinite solid. region. The density of y-iron (FCC) at 1000°C is 7.63 g/cm3, Do = 20x106 m2/s; Q = 142,000 J/mol
Its a thermal treatment of metallic materials from
material science questions
QUESTION 9 a) Heat treatment schedule for three (3) thin samples of plain carbon steel containing different carbon concentration is summarized in Table Q9(a). Determine and sketch the resultant microstructure for each steel. Distinguish steel 1 from steel 3 with reference to their mechanical properties. Table 29(a) Steel wt% C Heating temperature Soaking time (°C) (minutes) Cooling process 1 0.5 950 60 Furnace cooled 2 0.8 800 60 Air...
s. (15 points) Four kilograms ) what temperature muistns of steel containing 0.50 wt% carbon is to be heat treated. b) if slowly cooled from the Austenite phase, what jsrthe proeutectoid phase that is formed? c) how many kilograms of Pearlite will be in the steel when cooled to room temperature? d) compute the mass fractions 6t Péfrnite and Cemente in Peartite e) the microstructure of a different iron-carbon alloy consists of proeutectoid ferrite and pearlite. The containing 0.5 it...
Rapid cooling (thermal shock) of a thin layer of material causes a thermal shock stress. the thermal shock stress can be estimated by Εα(ΔT) σ, - σ 1-v Assume that a piece of materials in the table below contains a crack of a depth a 0.5 mm, calculate the surface temperature change necessary to cause brittle fracture for each material [6 marks]. Rank the materials in thermal shock resistance from the largest to the least [2 marks] hint: Y-0.72 small...
Question 3 34 pts ro 1 ri = 0.05m A pipe with surface temperature T1 - 458 K is wrapped with 0.04 m of glass fiber pipe insulation. The outer surface temperature of the insulation, T2 is equal to 347 K and its emissivity is equal to 0.68. The insulation is also subject to natural convection with a bulk fluid temperature of 298 K and h = 4 W/m2-K. For a pipe length of 100 m, and assuming that the...
Question 2 You are working as a crime scene investigator and must predict the temperature of a homicide victim over a 5-hr period. You know that the room where the victim was found was at 10 "C when the body was discovered. Newton's law of cooling says that the temperature of a body changes at a rate proportional to the difference between its temperature and that of the surrounding medium (the ambient temperature), where T = the temperature of the...
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate per unit length of the tube due to free convection. 2) Air at -10°C flows at 10 m/s over the roof plate of two 5m length rooms whose air is at Too-200C. The roof plate is 0.20-m thick concrete (k = 0.6 w/ m. K)....
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