Q1: Austenitized 40 mm diameter 5140 alloy steel bar is quenched in agitated oil. Predict what is theRockwell hardness of this bar will be at (a) its surface and (b) its center (c) What do you think aboutthe difference in hardness number between the center and surface (d) Differentiate between hardnessand hardenability (e) Rank the steels in the figure below from lowest to highest hardenability andexplain why.Cooling rate at 700°C (°C/sec)300150011/3 55100600Bar diameter (mm)806040200OLL00ww25 12.5 85S--------------M-R103/4-RAgitated oil15 201/43/4Distance from quenched end. De(Jominy distance)5.543Bar diameter (in.)025 mm1 in.Hardness (Rockwell C)Where (C = center, S = surface, M-R mid-radius)656055504540353025201510010120Distance from quenched end (mm)5140130L2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32Distance from quenched end (sixteenths of an inch)43404098404140864050

Answered: Image /qna-images/answer/15439f6a-9066-4ae7-b9fb-34c7d800457c.jpg

Q1: Austenitized 40 mm diameter 5140 alloy steel bar is quenched in agitated oil. Predict what is the Rockwell hardness of this bar will be at (a) its surface and (b) its center (c) What do you think about the difference in hardness number between the center and surface (d) Differentiate between hardness and hardenability (e) Rank the steels in the figure below from lowest to highest hardenability and explain why. 300 60055 100 Bar diameter (mm) 80 60 40 20 0 Cooling rate at 700°C (°C/sec) 0 5 25 10 12.5 M-R 34-R Agitated oil hi 15 20 14 1/2 3/4 Distance from quenched end, De (Jominy distance) 5.5 3 2 Bar diameter (in.) 0 25 mm 1 in. Where (C = center, S = surface, M-R = mid-radius) Hardness (Rockwell C) 65 60 55 30 25 20 15 10 10 5140 20 30 Distance from quenched end (mm) 4340 24 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Distance from quenched end (sixteenths of an inch) 40 9840 4140 8640 50

Q1: Austenitized 40 mm diameter 5140 alloy steel bar is quenched in agitated oil. Predict what is the Rockwell hardness of this bar will be at (a) its surface and (b) its center (c) What do you think about the difference in hardness number between the center and surface (d) Differentiate between hardness and hardenability (e) Rank the steels in the figure below from lowest to highest hardenability and explain why. 300 60055 100 Bar diameter (mm) 80 60 40 20 0 Cooling rate at 700°C (°C/sec) 0 5 25 10 12.5 M-R 34-R Agitated oil hi 15 20 14 1/2 3/4 Distance from quenched end, De (Jominy distance) 5.5 3 2 Bar diameter (in.) 0 25 mm 1 in. Where (C = center, S = surface, M-R = mid-radius) Hardness (Rockwell C) 65 60 55 30 25 20 15 10 10 5140 20 30 Distance from quenched end (mm) 4340 24 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Distance from quenched end (sixteenths of an inch) 40 9840 4140 8640 50

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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