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Dr Downey is trying his hand at fording and has made a blade of 15N20 steel that can be assumed to be a rectangle with the dimensions of 50x5x250mm. To get the best mechanical properties, the blade needs to be quenched (rapidly cooled) from 800°C to 125°C in oil at a temperature of 25°C to form Martensite. From his material science background Dr Downey calculates that the quench must not take longer than 200s. Some thermal transport properties are shown in the figure below. Calculate the time that is needed for the blade to reach 125°C. Will these conditions be less than the required quench time? Be sure to show that you have verified your method is valid. 250mm 5mm To: 25 °C h: 200 W/m²/K K15N20 35.7 W/m/K CP15N20 1058 J/kg/K P15N20 7817 kg/m³ 50mm

Dr Downey is trying his hand at fording and has made a blade of 15N20 steel that can be assumed to be a rectangle with the dimensions of 50x5x250mm. To get the best mechanical properties, the blade needs to be quenched (rapidly cooled) from 800°C to 125°C in oil at a temperature of 25°C to form Martensite. From his material science background Dr Downey calculates that the quench must not take longer than 200s. Some thermal transport properties are shown in the figure below. Calculate the time that is needed for the blade to reach 125°C. Will these conditions be less than the required quench time? Be sure to show that you have verified your method is valid. 250mm 5mm To: 25 °C h: 200 W/m²/K K15N20 35.7 W/m/K CP15N20 1058 J/kg/K P15N20 7817 kg/m³ 50mm

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Dr Downey is trying his hand at fording and has made a blade of 15N20 steel that can be assumed to be a rectangle with the dimensions of 50x5x250mm. To get the best mechanical properties, the blade needs to be quenched (rapidly cooled) from 800°C to 125°C in oil at a temperature of 25°C to form Martensite. From his material science background Dr Downey calculates that the quench must not take longer than 200s. Some thermal transport properties are shown in the figure below. Calculate the time that is needed for the blade to reach 125°C. Will these conditions be less than the required quench time? Be sure to show that you have verified your method is valid. 250mm 5mm To: 25 °C h: 200 W/m²/K K15N20 35.7 W/m/K CP15N20 1058 J/kg/K P15N20 7817 kg/m³ 50mm
Transcribed Image Text:Dr Downey is trying his hand at fording and has made a blade of 15N20 steel that can be assumed to be a rectangle with the dimensions of 50x5x250mm. To get the best mechanical properties, the blade needs to be quenched (rapidly cooled) from 800°C to 125°C in oil at a temperature of 25°C to form Martensite. From his material science background Dr Downey calculates that the quench must not take longer than 200s. Some thermal transport properties are shown in the figure below. Calculate the time that is needed for the blade to reach 125°C. Will these conditions be less than the required quench time? Be sure to show that you have verified your method is valid. 250mm 5mm To: 25 °C h: 200 W/m²/K K15N20 35.7 W/m/K CP15N20 1058 J/kg/K P15N20 7817 kg/m³ 50mm
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