3. An uncold-worked brass specimen of average grain size 0.01 mm has a yield strength of 150MPa (21,750 psi). Estimate the yield strength of this alloy after it has been heated to 500°C for1000 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)1.00.10.01110850°C800°C700°C102Time (min)(Logarithmic scale)600°C500°C103104

Step 1: Step 2: Step 3: Step 4:

Answered: 3. An uncold-worked brass specimen of…

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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The lower yield point for a certain plain carbon steelbar is found to be 135 MPa, while a second bar of the samecomposition yields at 260 MPa. Metallographic analysisshows that the average grain diameter is 50μm in the firstbar and 8μm in the second bar.a. Predict the grain diameter needed to cause a loweryield point of 205 MPa.b. If the steel could be fabricated to form a stablegrain structure of 500 nm grains, what strengthwould be predicted?c. Why might you expect the upper yield point to bemore alike in the first two bars than the lower yieldpoint?
The tensile strength for cold-rolled magnesium alloy AZ31B plate is approximately 160 MPa for specimens tested either parallel or perpendicular to the rolling direction. When similarly oriented specimens are compressed, the yield strength is only 90 MPa. Why? (Hint: Consider the possible deformation mechanisms available in the magnesium alloy and any crystallographic texture that might exist in the wrought plate.)
An uncold-worked brass specimen of average grain size 0.006 mm has a yield strength of 178 MPa. Estimate the yield strength of this alloy (in MPa) after it has been heated to 600°C for 1000 s, if it is known that the value of ky is 11 MPa-mm1/2. The Animated Figure 7.25 may be helpful. Attached is the question and the figure referenced.
It is known that a brass alloy has a yield strength of 275 MPa, a tensile strength of 380 MPa and a modulus of elasticity of 103 GPa. It is determined that a 12.7 mm diameter and 250 mm long cylindrical sample made of this alloy is elongated by 7.6 mm under the tensile stress effect. Based on this information, is it possible to calculate the magnitude of the load required to generate the said elongation? If possible, calculate, if not, explain why.
Briefly describe the metallographic procedure. Briefly explain the ASTM grain-size standard. Draw a stress-strain curve for a ductile metal and mention plastic region and 5 important parameters (or points) in your curve. Additionally, explain these parameters (if necessary provide the corresponding equations). Briefly describe the necessities of a compression test for some materials. Explain the reason that buckling happens during the compression test. Explain the Izod impact test. Explain the Brinell hardness test. Explain the creep test. Design and explain fatigue test setup for a crankshaft. Explain the salt spray test in corrosion tests
The yield strength for an alloy that has an average grain diameter of 4.1 × 10-2 mm is 131 MPa. At a grain diameter of 7.6 × 10-3 mm, the yield strength increases to 246 MPa. At what grain diameter, in mm, will the yield strength be 236 MPa?
A 1.5-cm-diameter metal bar with a 3-cm gage length (l0) is subjected to a tensile test. The following measurements are made: Determine the strain-hardening coefficient for the metal. Is the metal most likely to be FCC, BCC, or HCP? Explain.
Two copper samples with grain size (d) of 0.016 mm and 0.007 mm have the yield stresses of 125 MPa and 175 MPa, respectively. a) Determine the locking parameter (k) and frictional stress (σi) in the HallPetch equation.b) Calculate the yield strength of the brass when the average grain diameter is 0.05 mm.c) What must be the grain diameter if the yield strength in part (b) is to be increased two-fold?
The critical resolved shear stress for copper is 0.48 MPa. Determine the maximum possible yield strength for a single crystal of Cu pulled in tension.
The yield stress of AISI 1020 steel with a grain size of 200 μm is 200 MPa.Estimate the yield stress for a grain size of 10 μm if the Hall--Petch constantk = 0.8 MN/m3/2.
(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.
Briefly explain the ASTM grain-size standard. Draw a stress-strain curve for a ductile metal and mention plastic region and 5 important parameters (or points) in your curve. Additionally, explain these parameters (if necessary provide the corresponding equations).

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