(a) What is the approximate ductility (%EL) of a brass that has a yield strength of 350 MPa (50760 psi)?i%Elongation(b) What is the approximate Brinell hardness of a 1040 steel having a yield strength of 720 MPa (104400 psi)?iHB

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Answered: (a) What is the approximate ductility…

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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Specify a copper alloy that requires at least 50% elongation and at least 300 MPa tensile strength.
A 3105 aluminum plate is reduced from 4.38 cm to 2.88 cm. Determine the final properties of the plate. See attached figure
The yield strength for an alloy that has an average grain diameter of 5.9 x 10-2 mm is 148 MPa. At a grain diameter of 7.8 × 10-³ mm, the yield strength increases to 233 MPa. At what grain diameter, in mm, will the yield strength be 247 MPa? d = i mm
The yield strength for an alloy that has an average grain diameter of 5.2 x 102 mm is 110 MPa. At a grain diameter of 6.3 x 103 mm, the yield strength increases to 251 MPa. At what grain diameter, in mm, will the yield strength be 222 MPa? d = mm
3) (10) A 10-mm-diameter tungsten carbide sphere creates a 4.26-mm- diameter impression under a 3000-kg load. What are the yield and tensile strengths for 65-45-12 cast iron?
3. An uncold-worked brass specimen of average grain size 0.01 mm has a yield strength of 150 MPa (21,750 psi). Estimate the yield strength of this alloy after it has been heated to 500°C for 1000 s, if it is known that the value of σo is 25 MPa. (Note that the axis has logarithmic scale). Grain diameter (mm) (Logarithmic scale) 1.0 0.1 0.01 1 10 850°C 800°C 700°C 102 Time (min) (Logarithmic scale) 600°C 500°C 103 104
The yield strength for an alloy that has an average grain diameter of 4.6 x 10-2 mm is 105 MPa. At a grain diameter of 7.7 × 103 mm, the yield strength increases to 248 MPa. At what grain diameter, in mm, will the yield strength be 234 MPa? d = i mm
ANSWER Q4 PART B
1600 Question 4. An austenitized 4340 standard steel bar is cooled at different rates (see Figure 2). 0.41 C,0.87 Mn, 0.28 Si, L.83 Ni. 0.72 Cr, 0.20 Mo 12.7 mm 4340 25 mm 800 mm 19 mm Austenitized at 1550F (843 C) Grain size: ASTM No.7 Acy: 1390'F (754 C) Ac: 1330'F (721'C) Predict what will be the constituents in the 1400 Va in. microstructure of the bar at 200°C for the 6.3 mm 700 76 mm following cooling rates: 1200 9.5 mm Cooling curves from 1550'F (843 C) at indicated distances from quenched end mm 600 (a) 5°C/s (51-mm from the quenched end of a Jominy bar) (b) 8°C/s (19.0-mm from the quenched end of a Jominy bar) (c) 50°C/s (9.5-mm from åe quenched end of a Jominy bar) E 1000 |500 800 400 Transformed 600 No% 300 M+A 400 200 200 100 1000 10 20 50 100 200 500 Cooling time (s) Figure 2 Temperature (F) Temperature (C)
(b) The yield stress for a metal changes from 450 Nmm-2to 610 Nmm-2 when the average grain diameter decrease from 0.043 mm to 0.022 mm. Determine the yield stressfor the same metal with an average grain diameter of 0.030 mm.

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(a) What is the approximate ductility (%EL) of a brass that has a yield strength of 350 MPa (50760 psi)? i %Elongation