1 day 1 month 1 year 70 1 min 1 h Figure 11.27 The precipitation hardening 121°C (250°F) 60 characteristics of a 400 2014 aluminum alloy (0.9 wt% Si, 4.4 wt% Cu, 0.8 wt% Mn, 50 300 149°C 40 0.5 wt% Mg) at four different aging temperatures: (a) yield strength, and (b) ductility (%EL). [Adapted from (300°F) 200 30 204°C (400°FH 20 100 260°C (500°F) Metals Handbook: 10 Properties and Selection: Nonferrous Alloys and Pure Metals, Vol. 2, 9th edition, H. Baker 10-2 101 1 10 102 103 104 Duration of precipitation heat treatment (h) (a) (Managing Editor), American Society for Metals, 1979, р. 41.] 1 min 1h 1 day 1 month 1 year 30 204°C (400°F) 149°C 121°C (300°F) (250°F) 20 10 260°C (500°F) 10-2 10-1 102 103 104 1 10 Duration of precipitation heat treatment (h) (b) Yield strength (MPa) Ductility (% EL in 2 in. or 50 mm) Yield strength (ksi)

1 day 1 month 1 year 70 1 min 1 h Figure 11.27 The precipitation hardening 121°C (250°F) 60 characteristics of a 400 2014 aluminum alloy (0.9 wt% Si, 4.4 wt% Cu, 0.8 wt% Mn, 50 300 149°C 40 0.5 wt% Mg) at four different aging temperatures: (a) yield strength, and (b) ductility (%EL). [Adapted from (300°F) 200 30 204°C (400°FH 20 100 260°C (500°F) Metals Handbook: 10 Properties and Selection: Nonferrous Alloys and Pure Metals, Vol. 2, 9th edition, H. Baker 10-2 101 1 10 102 103 104 Duration of precipitation heat treatment (h) (a) (Managing Editor), American Society for Metals, 1979, р. 41.] 1 min 1h 1 day 1 month 1 year 30 204°C (400°F) 149°C 121°C (300°F) (250°F) 20 10 260°C (500°F) 10-2 10-1 102 103 104 1 10 Duration of precipitation heat treatment (h) (b) Yield strength (MPa) Ductility (% EL in 2 in. or 50 mm) Yield strength (ksi)

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

See similar textbooks

Similar questions

800 A Eutectoid temperature H 1400 700 A H 1200 600 1000 500 B 800 400 A 300 600 M(start) 200 M + A 50% 400 M(50%) M(90%) 100 200 10-1 1 10 102 103 104 105 Time (s) Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, specify the final microstructure and approximate amount of each. Assume a small specimen has been held long enough to have achieved a complete and homogeneous austenitic structure prior to treatment. Sample (1): Quickly cool specimen from 800°C to 575°C, hold for 10 s, then quench to room temperature. Sample (2): Quickly cool specimen from 800°C to 500°C, hold for 100 s, then quench to room temperature. O after treatment, sample 1 is 50% pearlite, 50% austenite O after treatment, sample 2 is bauxite O after treatment, sample 1 is 25% pearlite O after treatment, sample 2 is bainite O after treatment, sample 2 is austenite O None of the answers is correct. O after treatment, sample 2 is coarse pearlite O after treatment, sample 1 is…
Determine the tensile strength, yield strength and percentage elongation (% ductility) for an iron- carbon alloy with 0.76 wt % carbon composition. O Yield strength - 60000 psi : Tensile strength - 110000 psi: Ductility - 15% O Yield strength - 130000 psi : Tensile strength - 68000 psi;: Ductility - 10% O Yield strength - 68000 psi : Tensile strength - 130000 psi; Ductility - 10% O Yield strength 50000 psi: Tensile strength - 100000 psi: Ductility - 20% O Yield strength - 86000 psi : Tensile strength 150000 psi: Ductility 25%
Describe the final microstructure obtained in a 1050 steel after heat at 8200C, cooled to 7000C and hold for 5 s, cooled to room temperature. 900- a+y 800 A, 700 A1 F, Pr a+ pearlite 23 600 -y+a+pearlite 30 500 B1 y+ bainite Bainite 39 F=Ferrite B, M, 400 49 P=Pearlite 300 Y+ martensite B=Bainite 200 Martensite M=Martensite 62 100- 102 10 10 10 10 0.1 1 10 Time (s) TTT curve for carbon steel AISI 1050 Temperature (°C) Rockwell C hardness
For a Fe-C alloy with a eutectoid composition, an austenite was rapidly cooled down to 450°C, held for 10 sec, and quenched to room temperature. What is the final microstructure based on its TTT curve? Amount Temperature of Transformation, C 700 600 500 400 300 200 Ae₂! Ae₁ Austenite unstable Ms. 10 10² 103 104 105 seconds Austenite stable 50%- 100 MF TELEP P 100% completed F+B Coarse Pearlite - Fine Pearlite -Upper Bainite (Feathery) Lower Bainite → Martensite + Bainite Martensite 1 1sec 1 min 1hr Transformation Time (Log. Scale) O a. 50% bainite and 50% martensite O b. 50% austenite and 50% bainite O c. 100% bainite O d. 100% martensite Finer Lamellac Bainitic Pearlitic Austenite Fine more Acicular Rapid Etching Martensitic cicular, Slow Etching V.P.H. 210 320 450 700 750
The TTT diagram for a 1077 eutectoid steel is given. Explain the heat treatment process to form 50% Fine Pearlite + 50% Coarse Bainite. 800 A 1400 Eutectoid temperature 700 A 1200 600 1000 500 B 800 400 A 300 600 M(start) 200 M + A 50% 400 M(50%) М190%) 100 200 10-1 1 10 102 103 104 105 Time (s) Temperature (°C) Temperature (°F)
Excellent combinations of hardness, strength, and toughness are obtained from bainite. One heat treater austenitized a eutectoid steel at 750°C, quenched and held the steel at 250°C for 15 min, and finally permitted the steel to cool to room temperature. Did he produce the required bainitic structure? Use the diagram below in your answer 900 600 700 14 00 Y. 400 12 52 M. 00 57 M. 100 0.3 10 10 10 Answer: Time Temperature ("C) Rockwell Chardnens
The Sheady Ceap data of stainless cheel tkon at Stress level Fompa ů qiven in te Table Compute he steady-ctate Cleep dets for this alloy at 1a5ok and Shee level of 5omPaf Hhe shees erpinen t fox the alloy ū 7.0. fempersiuse 977 1089 2.0X 183
2) There is an aluminum-copper alloy. The phase diagram is given below. What heat treatment do you apply? Using this graph, how is it possible to increase the strength and hardness of this alloy? Consider this question within the scope of heat treatments. Composition (at % Cu) 10 20 30 700 1200 600 L a+ L 0 +L 1000 a 500 (CuAl,) a + 0 800 400 600 300 10 20 30 40 50 (AI) Composition (wt% Cu) Temperature (°C) Temperature (°F)
Question 1 You are working on a design team at a small orthopaedic firm. You have been asked to select a cobalt- chrome-molybdenum (CoCr) material that will not experience plastic deformation under a specific mechanical test, as follows... A tensile stress is applied along the long axis of a solid cylindrical rod that has a diameter of 10 mm. An applied load of some magnitude F produces a 7x10³ mm change in diameter (see figure below, original shape is blue, elongated shape is unshaded). Q1F: How would the "new alloy" material (with different properties as shown below) behave, assuming it has the same initial diameter (10mm) and applied load (F) in the tensile test? That is, would it experience plastic deformation (yield) under the conditions of this problem?
O The following engineering stress-strain data were obtained for a 0.2% C plain-carbon steel. (i) Plot the engineering stress-strain curve. (ii) Determine the ultimate tensile strength of the alloy. (iii) Determine the percent elongation at fracture. Engineering Engineering Engineering Engineering Stress Strain Stress Strain (ksi) (in./in.) (ksi) (in./in.) 76 0.08 30 0.001 75 0.10 55 0.002 73 0.12 60 0.005 69 0.14 68 0.010 65 0.16 72 0.020 56 0.18 74 0.040 51 0.19 75 0.060 (Fracture)
503 90⁰⁰ Recovery Recrystallization Grain Growth o dese d time -2. Immediately after recrystallization during annealing, this alloy was quickly cooled. Assume that cooling after recrystallization doesn't change the alloy's microstructure. The yield strength oy increased to 200 MPa after recrystallization, compared to 150 MPa which is the fully annealed state do before 80% CW. 4.2.1. What is the possible mechanism of oy → grain refinement increase? The mechanism is working hardening (cold w
According to Reference [1], alloys of nickel (Ni) and tungsten (W) are can form substitutional solid solutions up to approximately 11 at% W. Consider two different alloy compositions: Ni-5W (5 at% W) and Ni-10.5W (10.5 at% W). A. Which composition should be more ductile? B. Which composition should be stronger? C. Using the oy~ C¹/2 relationship from the lecture slides, how many times larger should the yield strength be for Ni-10.5W compared to Ni-5W? D. Where should the tungsten atoms sit relative to the dislocation on or opposite the side with the extra half-plane? You will need information from Appendixes of the textbook.