Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 5.7, Problem 46SEP
To determine
Show, using equations only, that as time increases in the gas carburization process, the concentration
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Problem 2
Determine the carburizing time necessary to achieve a carbon concentration of 0.45 wt% at a
position 2 mm into an iron-carbon alloy that initially contains 0.20 wt% C. The surface
concentration is to be maintained at 1.30 wt% C, and the treatment is to be conducted at 1000 °C.
Use the diffusion data for y-Fe in Table 5.2.
A mechanism for hardening steel is called carburization. To achieve this process, the piece of steel is exposed to an atmosphere rich in hydrocarbon such as methane (CH4). Consider a steel with a carbide concentration of 0.25wt%, which must be treated at 950˚C. If the carbon concentration at the surface is suddenly increased to 1.20wt%, how long does it take for a penetration of 0.5mm from the surface to reach a concentration of 0.80wt%? . The diffusion coefficient for carbon in iron at this temperature is 1.6 x 10-11 m2s-1. Assume that the piece of steel is semi-finite. Use the table below.
Decarburization of a steel occurs when carbon diffuses from the steel to the surface and enters the atmosphere. How long will it take for a 0.6 % C steel surface to decarburize below 0.1 % C for a depth of 2 mm if the FCC steel is held at 1250 °C in an atmosphere containing zero carbon? I need this question's answer. It's important for me.
Chapter 5 Solutions
Foundations of Materials Science and Engineering
Ch. 5.7 - Prob. 1KCPCh. 5.7 - Write an equation for the number of vacancies...Ch. 5.7 - Prob. 3KCPCh. 5.7 - Prob. 4KCPCh. 5.7 - Describe the substitutional and interstitial...Ch. 5.7 - Prob. 6KCPCh. 5.7 - What factors affect the diffusion rate in solid...Ch. 5.7 - Write the equation for Ficks second law of...Ch. 5.7 - Prob. 9KCPCh. 5.7 - Prob. 10KCP
Ch. 5.7 - (a) Calculate the equilibrium concentration of...Ch. 5.7 - Prob. 12AAPCh. 5.7 - Determine the diffusion flux of zinc atoms in a...Ch. 5.7 - The diffusion flux of copper solute atoms in...Ch. 5.7 - Prob. 15AAPCh. 5.7 - Prob. 16AAPCh. 5.7 - Prob. 17AAPCh. 5.7 - A gear made of 1020 steel (0.20 wt% C) is to be...Ch. 5.7 - Prob. 19AAPCh. 5.7 - The surface of a steel gear made of 1020 steel...Ch. 5.7 - Prob. 21AAPCh. 5.7 - If boron is diffused into a thick slice of silicon...Ch. 5.7 - Prob. 23AAPCh. 5.7 - Prob. 24AAPCh. 5.7 - Prob. 25AAPCh. 5.7 - Prob. 26AAPCh. 5.7 - Prob. 27AAPCh. 5.7 - Prob. 28AAPCh. 5.7 - Prob. 29AAPCh. 5.7 - Prob. 30AAPCh. 5.7 - The diffusivity of copper atoms in the aluminum...Ch. 5.7 - Prob. 32AAPCh. 5.7 - Prob. 33SEPCh. 5.7 - Prob. 34SEPCh. 5.7 - Prob. 37SEPCh. 5.7 - Prob. 38SEPCh. 5.7 - The activation energy of nickel atoms in FCC iron...Ch. 5.7 - Prob. 40SEPCh. 5.7 - The self-diffusion of iron atoms in BCC iron is...Ch. 5.7 - Would you expect the diffusion rate of copper...Ch. 5.7 - Would you expect the diffusion rate of copper...Ch. 5.7 - Prob. 44SEPCh. 5.7 - Prob. 45SEPCh. 5.7 - Prob. 46SEPCh. 5.7 - Prob. 47SEPCh. 5.7 - Prob. 48SEPCh. 5.7 - Prob. 49SEPCh. 5.7 - Prob. 50SEP
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- A student performing this lab experiment receives his unknown solution that may contain ( Ba, Ca, and Mg). And begins to conduct tests to identify 2+ 2+ 2+ the cations present in the unknown solution. Based on the following observation 1) When the unknown solution was treated with K,Cro4, no precipitate was formed. 2) The resulting solution from step 1 was basified with 6M NH, before the addition of aqueous K,C,0, which forms a white precipitate. 3) To the resulting solution from step 2, was treated with ammonia and of Na,HPO,· A white precipitate 4 was formed after heating the solution for 10 minutes at 60°C. Which cations were present in the student's unknown solution? Select one or more: 2+ Ва 2+ Mg 2+ Саarrow_forwardDetermine the carburizing time necessary to achieve a carbon concentration of 0.50 wt% at a position 3.1 mm into an iron-carbon alloy that initially contains 0.12 wt% C. The surface concentration is to be maintained at 1.2 wt% C, and the treatment is to be conducted at 1080°C. Assume that Do = 5.8 x 10-5 m²/s and Qd = 156 kJ/mol. The table Tabulation Error Function Values may be useful.arrow_forwardFor a steel alloy it has been determined that a carburizing heat treatment of 16 h duration at 731°C will raise the carbon concentration to 0.40 wt% at a point 3.9 mm from the surface. Estimate the time necessary to achieve the same concentration at a 7.9 mm position for an identical steel and at a carburizing temperature of 1060°C. Assume that Do is 1.9 x 105 m²/s and Quis 108 kJ/mol, 3.89 -land Madin harrow_forward
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