The cooling rate (in °C/s) at the center of a shaft with diameter d (in mm) is given by thefollowing formulalog 10(CR)-1.8024 log 10(d) + 4.0565%3Dand the critical cooling rate (CCR in °C/s) of low alloys steels is given as a function of amount ofalloying element (in wt%6) as follow.log 10(CCR)= 4.3-3.27×C-(Mn + Cr+Mo+ Ni)1.6Find the maximum diameter (in mm) of a shaft to be made of alloy A (such that 100%martensite will be produced after quenching) from the following table is given below:Alloy Weight Percentage (wr%)Mn CrMo NiA03 08 05 02 0550.4 0.6 1.20.3 50 36 0.7 15 2550.4 06 120.15 50 41 0 85o 5 o 25 o s504 0.65 0 75 0 25 p.85

Data given - For alloy A C = 0.3 , Mn = 0.8 , Cr = 0.50. , Mo = 0.2, Ni = 0.55

The cooling rate (in °C/s) at the center of a shaft with diameter d (in mm) is given by the following formula log 10(CR) -1.8024 log 10(d) + 4.0565 %3D and the critical cooling rate (CCR in "C/s) of low alloys steels is given as a function of amount of alloying element (in wt%6) as follow (Mn + Cr+Mo+Ni) 1.6 * log 10(CCR) = 4.3-3.27×C- Find the maximum diameter (in mm) of a shaft to be made of alloy A (such that 100% martensite will be produced after quenching) from the following table is given below: Alloy Weight Percentage (wr%) C. Mn Cr Mo Ni 03 08 05 02 055

The cooling rate (in °C/s) at the center of a shaft with diameter d (in mm) is given by the following formula log 10(CR) -1.8024 log 10(d) + 4.0565 %3D and the critical cooling rate (CCR in "C/s) of low alloys steels is given as a function of amount of alloying element (in wt%6) as follow (Mn + Cr+Mo+Ni) 1.6 * log 10(CCR) = 4.3-3.27×C- Find the maximum diameter (in mm) of a shaft to be made of alloy A (such that 100% martensite will be produced after quenching) from the following table is given below: Alloy Weight Percentage (wr%) C. Mn Cr Mo Ni 03 08 05 02 055

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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Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

The cooling rate (in °C/s) at the center of a shaft with diameter d (in mm) is given by the
following formula
log 10(CR)
-1.8024 log 10(d) + 4.0565
%3D
and the critical cooling rate (CCR in °C/s) of low alloys steels is given as a function of amount of
alloying element (in wt%6) as follow.
log 10(CCR)= 4.3-3.27×C-
(Mn + Cr+Mo+ Ni)
1.6
Find the maximum diameter (in mm) of a shaft to be made of alloy A (such that 100%
martensite will be produced after quenching) from the following table is given below:
Alloy Weight Percentage (wr%)
Mn Cr
Mo Ni
A
03 08 05 02 055
0.4 0.6 1.2
0.3 5
0 36 0.7 15 255
0.4 06 12
0.15 5
0 41 0 85o 5 o 25 o s5
04 0.65 0 75 0 25 p.85

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13 °C 900 800 700 600 500 400 300 200 100 S CONTINUOUS COOLING TRANSFORMATION DIAGRAM '44' C ANALYSIS Wt% (See note on page 8) Mn PS Cr 0.81 0.035 0.037 0.14 Ac, Ac₁ M₂ mm 0,1 BAR 15 DIAMETER C Si 0.44 0.28 10 M 0.2 10 + + I 20 A 50 5 Mo 0.04 50 AUSTENITISED AT 850 C PREVIOUS TREATMENT ROLLED 1000 COOLING RATE AT 700 C Ni Al 0.15 500 200 100 10 - 100 20 Nb 50 50 100 150 200 V Cu 0.12 20 10 C PER MIN 100 200 1 300 150 200 300 500 500 Sn 0.016 5 START] FINISH 500 1000 mm OIL -mm WATER 10% 50% 90% 2000 mm LAIR Figure A3-2: CCT diagram for AISI 1044 with applicable 20 mm bar diameter annotation for water (black dashed line) and air (red dashed line). F = ferrite, P = pearlite, B = bainite and M = martensite.
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