Following is tabulated data that were gathered from a series of Charpy impact tests on a tempered 4140 steel alloy. Temperature (℃) 100 75 50 25 0 -25 -50 -65 -75 -85 -100 -125 -150 -175 Impact Energy (J) 89.3 88.6 87.6 85.4 82.9 78.9 73.1 66.0 59.3 47.9 34.3 29.3 27.1 25.0 (a) Plot the data as impact energy versus temperature. (you can use Excel or other software). (b) Determine a ductile-to-brittle transition temperature as that temperature corresponding to the average of the maximum and minimum impact energies. (c) Determine a ductile-to-brittle transition temperature as that temperature at which the impact energy is 70 J.

Following is tabulated data that were gathered from a series of Charpy impact tests on a tempered 4140 steel alloy. Temperature (℃) 100 75 50 25 0 -25 -50 -65 -75 -85 -100 -125 -150 -175 Impact Energy (J) 89.3 88.6 87.6 85.4 82.9 78.9 73.1 66.0 59.3 47.9 34.3 29.3 27.1 25.0 (a) Plot the data as impact energy versus temperature. (you can use Excel or other software). (b) Determine a ductile-to-brittle transition temperature as that temperature corresponding to the average of the maximum and minimum impact energies. (c) Determine a ductile-to-brittle transition temperature as that temperature at which the impact energy is 70 J.

Precision Machining Technology (MindTap Course List)

2nd Edition

ISBN:9781285444543

Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Publisher:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Chapter2: Measurement, Materials, And Safety

Section2.7: Heat Treatment Of Metals

Problem 2RQ: Direct hardening can be performed on steel containing at least________ carbon.

See similar textbooks

Similar questions

A-10 Typical properties of carbon and alloy steels. Ultimate strength, s, Yield strength, s, Percent Material SAE no. Condition ksi MPa ksi MPa elongation 1020 Annealed 57 393 43 296 36 1020 Hot rolled 65 448 48 331 36 1020 Cold drawn 75 517 64 441 20 1040 Annealed 75 517 51 352 30 1040 Hot rolled 90 621 60 414 25 1040 Cold drawn 97 669 82 565 16 1040 WQT 700 WQT 900 127 876 93 641 19 1040 118 814 90 621 22 1040 WQT 1100 WQT 1300 107 738 80 552 24 1040 87 600 63 434 32 1080 Annealed 89 614 54 372 25 1080 OQT 700 OQT 900 OQT 1100 OQT 1300 189 1303 141 972 12 1080 179 1234 129 889 13 1080 145 1000 103 710 17 1080 117 807 70 483 23 1141 Annealed 87 600 51 352 26 1141 Cold drawn 112 772 95 655 1141 14 OQT 700 OQT 900 OQT 1100 OQT 1300 193 1331 172 1186 1141 9 146 1007 129 1141 889 15 116 800 97 1141 669 20 94 648 68 469 28 4140 Annealed 95 655 60 4140 414 OQT 700 OQT 900 OQT 1100 OQT 1300 231 26 4140 1593 212 1462 187 1289 12 4140 173 1193 147 1014 15 4140 131 903 118 18 814 101 5160 696…
Question 9 An Ag-Cu alloy contains 25% a and 75% B at 600"C. The composition of the overall alloy is approximately 1000 L+B 800 a /8.87. 28-12 9224 a +8 500 972 400 Ag 10 20 30 40 50 60 70 80 90 Cu Cu (by weight) O A. 73.5% Cu OB. 65.8% Cu OC. 89.6% Cu D 80.2% Cu
Carbonitriding is a case-hardening process in which a steel is heated in a gaseous atmosphere of such composition that carbon and nitrogen are absorbed simultaneously. Carbonitriding is a modification of the nitriding process. True False Based upon the percent elongation of a tensile sample, a ductile engineering material is defined by a value equal to or greater than 5% and a brittle material is defined by a value less than 5%. True False
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)
Fatigue data of steel is showed in the following stress-cycle curve.Write down the values of steel endurance limit and steel fatigue strength at 10^5 cycles in the spaces provided below.Steel Endurance Limit: _____ ksiteel Fatigue Strength at 10^5 cycles: _____ ksi
The engineering stress-strain curve below was obtained for a precipitation hardened Aluminum alloy. What is the approximate Yield Strength for this alloy in psi? Engineering Stress Based on Original Area (psi) 50,000 45,000 40,000 35,000 30,000 25,000 20,000 15,000 10,000 5,000 0 O 0.02 0.04 0.06 Aluminum 6061-T6 0.08 0.1 0.12 Engineering Strain (in/in) 0.14 X 0.16 0.18
27C) Sample of an aluminum alloy has a tensile strength of 140 MPa, What will be the maximum force that can be withstood by a rod of that alloy with a cross-sectional area of 1 cm2?
Question One (Compulsory) Composition (atk Sn) 100 20 40 60 80 327C B00 300 Liquid 500 232C 400 200 183C 07.8 18.3 61.9 300 100- H200 100 BO 100 20 40 60 Pb) Compesition (wt% Sn) Figure 1: Lead -tin phase diagram Figure I above shows a lead-tin (alloy) phase diagram. Consider an alloy composition of 55 wt% Sn - 45 wt% Pb. Answer the following questions: (i) Name the phases present and their compositions in the alloy at 150°C. (ii) Describe the structural and composition changes in the alloy when it is cooled from 190°C to 20°C. (iii) What are the compositions of phases at the eutectic point and why is this point important for the alloy? (iv) Given that the average density of a phase is determined as Pa = 100 ,calculate the PA PB volume fractions of the phases at the given compositions and at 150°C. Take the densities of lead and tin as 11.34 g/cm' and 7.36 g/cm' while the mass fraction of a is 0.21. (v) Name and describe four industrial applications of lead-tin alloys. ta aroundu (3.)…
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…
1800 lbs of dolomite per hour is produced by crushing and then screening through a 14-mesh screen. The screen analysis is as follows: The total load to the crusher in lbs/hr isA. 6300B. 6510C. 6400D. 6320
al 72% Í 22:39 365 3bed sleimen 10 minutes ago Question 1 Determine the percentage of ductility of a metal alloy having the following tensile stress-strain diagram. Not yer answered Stress-Strain Diagram Marked out of 15.00 P lag question 025 Strain jem/em Select one: O 25% O 0.26
Question 4 A segment of the Fe/C alloy phase diagram is shown below: Composition (at% C) 15 Temperature (°C) 0 1600 1400 1200 1000 800 600 400 1538°C 0 (Fe) 8 Y 912°C -1493 C 1394-C Y. Austenite 0.76 0.022 a, Ferrite 1 y+L 2 2.14 10 1147 C at Fe₂C L 4.30 Y+Fe3C 4 3 Composition (wt% C) 727°C 20 Cementite (Fe-C) 5 6 25 2500 2000 1500 1000 6.70 Temperature (°F) a) What are the equilibrium phases, compositions and relative fractions of the Fe-C alloy at an average composition Ccarbon of 2% and a temperature of 730 °C? b) What are the equilibrium phases, compositions and relative fractions of the Fe-C alloy at an average composition Ccarbon of 2% and a temperature of 725 °C? 7 c) Sketch the microstructure of the alloy obtained by quick cooling of the alloy from the conditions in part a) to the conditions in part b). Be sure to identify the phases in your sketch.