Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 9.13, Problem 89AAP
To determine
Refer Figure 9.38, and find the constituents in the microstructure of the 4340 standard steel bar at
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A 0.25% C hypoeutectoid plain-carbon steel is slowly cooled from 950°C to a temperature just slightly below 723°C.(a) Calculate the weight percent proeutectoid ferrite in the steel.(b) Calculate the weight percent eutectoid ferrite and weight percent eutectoid cementite in the steel.
A nitriding heat treatment of a BCC steel normally requires 2 h at 600 °C. What temperature would be required to reduce the heat treatment time to 1 h?(Q =76570 J/mol, Do =0.0047x10- 4 m2/s)
Excellent combinations of hardness, streneth, and toughness are obtained from
bainite. One heat treater austenitized a eutectoid steel at 750°C, quenched and
haid the steal at 250°C for 15 min, and finaly permitted the staal to cool to
room temperature. Did he produce the required bainitic structure? Use the
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Chapter 9 Solutions
Foundations of Materials Science and Engineering
Ch. 9.13 - (a) How is raw pig iron extracted from iron oxide...Ch. 9.13 - (a) Why is the FeFe3C phase diagram a metastable...Ch. 9.13 - (a) What is the structure of pearlite? (b) Draw a...Ch. 9.13 - Distinguish between the following three types of...Ch. 9.13 - Prob. 5KCPCh. 9.13 - (a) Define an FeC martensite. (b) Describe the...Ch. 9.13 - (a) What is an isothermal transformation in the...Ch. 9.13 - How does the isothermal transformation diagram for...Ch. 9.13 - Draw a continuous-cooling transformation diagram...Ch. 9.13 - (a) Describe the full-annealing heat treatment for...
Ch. 9.13 - Describe the process-annealing heat treatment for...Ch. 9.13 - What is the normalizing heat treatment for steel...Ch. 9.13 - Describe the tempering process for a plain-carbon...Ch. 9.13 - (a) Describe the martempering (marquenching)...Ch. 9.13 - (a) Describe the austempering process for a...Ch. 9.13 - (a) Explain the numbering system used by the AISI...Ch. 9.13 - (a) What arc some of the limitations of...Ch. 9.13 - (a) What compounds docs aluminum form in steels?...Ch. 9.13 - Prob. 19KCPCh. 9.13 - (a) Define the hardenability of a steel. (b)...Ch. 9.13 - Prob. 21KCPCh. 9.13 - Prob. 22KCPCh. 9.13 - Prob. 23KCPCh. 9.13 - What is the difference between a coherent...Ch. 9.13 - Prob. 25KCPCh. 9.13 - Prob. 26KCPCh. 9.13 - Prob. 27KCPCh. 9.13 - (a) Describe the three principal casting processes...Ch. 9.13 - Prob. 29KCPCh. 9.13 - Prob. 30KCPCh. 9.13 - Prob. 31KCPCh. 9.13 - Prob. 32KCPCh. 9.13 - Prob. 33KCPCh. 9.13 - Prob. 34KCPCh. 9.13 - Prob. 35KCPCh. 9.13 - (a) What are the cast irons? (b) What is their...Ch. 9.13 - Prob. 37KCPCh. 9.13 - Prob. 38KCPCh. 9.13 - Prob. 39KCPCh. 9.13 - Prob. 40KCPCh. 9.13 - Prob. 41KCPCh. 9.13 - Prob. 42KCPCh. 9.13 - Prob. 43KCPCh. 9.13 - Prob. 44KCPCh. 9.13 - Prob. 45KCPCh. 9.13 - (a) Why arc titanium and its alloys of special...Ch. 9.13 - Prob. 47KCPCh. 9.13 - Prob. 48KCPCh. 9.13 - Prob. 49KCPCh. 9.13 - Prob. 50KCPCh. 9.13 - Prob. 51KCPCh. 9.13 - Prob. 52KCPCh. 9.13 - Describe the structural changes that take place...Ch. 9.13 - Describe the structural changes that take place...Ch. 9.13 - If a thin sample of a eutectoid plain-carbon steel...Ch. 9.13 - If a thin sample of a eutectoid plain-carbon steel...Ch. 9.13 - (a) What types of microstructures arc produced by...Ch. 9.13 - A 0.65 % C hypoeutectoid plain-carbon steel is...Ch. 9.13 - A 0.25% C hypoeutectoid plain-carbon steel is...Ch. 9.13 - A plain-carbon steel contains 93 wt % ferrite7 wt%...Ch. 9.13 - A plain-carbon steel contains 45 wt% proeutectoid...Ch. 9.13 - A plain-carbon steel contains 5.9 wt%...Ch. 9.13 - A 0.90% C hypereutectoid plain-carbon steel is...Ch. 9.13 - A 1.10% C hypereutectoid plain-carbon steel is...Ch. 9.13 - If a hypereutectoid plain-carbon steel contains...Ch. 9.13 - A hypereutectoid plain-carbon steel contains 10.7...Ch. 9.13 - A plain-carbon steel contains 20.0 wt%...Ch. 9.13 - A 0.55% C hypoeutectoid plain-carbon steel is...Ch. 9.13 - A hypoeutectoid steel contains 44.0 wt% eutectoid...Ch. 9.13 - A hypoeutectoid steel contains 24.0 wt% eutectoid...Ch. 9.13 - A 1.10 % C hypereutectoid plain-carbon steel is...Ch. 9.13 - Draw timetemperature cooling paths for a 1080...Ch. 9.13 - Draw timetemperature cooling paths for a 1080...Ch. 9.13 - Thin pieces of 0.3-mm-thick hot-rolled strips of...Ch. 9.13 - Prob. 75AAPCh. 9.13 - Prob. 76AAPCh. 9.13 - Prob. 77AAPCh. 9.13 - Prob. 78AAPCh. 9.13 - Prob. 79AAPCh. 9.13 - Prob. 80AAPCh. 9.13 - Prob. 81AAPCh. 9.13 - Prob. 82AAPCh. 9.13 - An austenitized 40-mm-diameter 4340 steel bar is...Ch. 9.13 - Prob. 84AAPCh. 9.13 - Prob. 85AAPCh. 9.13 - Prob. 86AAPCh. 9.13 - Prob. 87AAPCh. 9.13 - Prob. 88AAPCh. 9.13 - Prob. 89AAPCh. 9.13 - Prob. 90AAPCh. 9.13 - Prob. 91AAPCh. 9.13 - Prob. 92AAPCh. 9.13 - (a) For a plain-carbon steel with 1 wt % carbon...Ch. 9.13 - Prob. 94SEPCh. 9.13 - Prob. 95SEPCh. 9.13 - Prob. 96SEPCh. 9.13 - Prob. 97SEPCh. 9.13 - Prob. 98SEPCh. 9.13 - Prob. 99SEPCh. 9.13 - Prob. 100SEPCh. 9.13 - Prob. 101SEPCh. 9.13 - Prob. 102SEPCh. 9.13 - Prob. 103SEPCh. 9.13 - Both 4140 and 4340 steel alloys may be tempered to...Ch. 9.13 - Prob. 105SEPCh. 9.13 - Aircraft fuselage is made of aluminum alloys 2024...Ch. 9.13 - Prob. 107SEPCh. 9.13 - Prob. 108SEPCh. 9.13 - Prob. 109SEPCh. 9.13 - (a) What makes austenitic stainless steels that...Ch. 9.13 - Prob. 111SEPCh. 9.13 - Prob. 112SEPCh. 9.13 - Prob. 113SEPCh. 9.13 - (a) Give examples of components or products that...Ch. 9.13 - Prob. 115SEPCh. 9.13 - Prob. 116SEPCh. 9.13 - Prob. 117SEP
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- A 609 g eutectoid steel ( about 0.8%C) is heated to 1,002 C and cooled slowly through the eutectorid temperature. This results in the formation of cementite Fe3C (6.67%C) and ferrite (0.025%C). Calculate the number of grams of cementite that form in the steel.arrow_forwardA nitriding heat treatment of a BCC steel normally requires 2 h at 600 °C. What temperature would be required to reduce the heat treatment time to 1 h?(Q =76570 J/mol, Do =0.0047x10- 4 m2/s) and the last one. thanks for ur helping.arrow_forward2 By using the Iron - Carbon diagram that you have. Find 5 of the following. 1- Find the Eutectic, Eutectoid temperature of cast iron with 4.3% C 2- The microstructure of Cast iron with 3.5% C. 3- Find the melting point and microstructure of steel with 0.83% C 4- Define the temperature range for Acm temperature. 5- Find the AC3, Ac¡ temperature of steel with 0.45% C 6- The Liquid and Austinite percent with chemical composition for cast iron with 2.3% C at 1300°Carrow_forward
- (11.10) Suppose that a steel of eutectoid composi- tion is cooled to 550°C (1020°F) from 760°C(1400°F) in less than 0.5 s and held at this temperature. (a) How long will it take for the austenite- to pearlite reaction to go to 50% comple- ton? To 100% completion? (b) Estimate the hardness of the alloy that has completely transformed to pearlite? 11.12) Briefly cite the differences between pearl- rp. bainite, and spheroidite relative to crostructure and mechanical properties?arrow_forwardProblem 1 A 0.65 percent C hypoeutectoid plain-carbon steel is slowly cooled from about 950°C to a temperature just slightly above 723°C. Calculate the weight percent austenite and weight percent proeutectoid ferrite in this steel. a +y a a 0.02% C 0.65% C 0.80% Carrow_forwardIf a 0.80 percent plain carbon steel is austenitized (heated to a read heat) and quenched in water to room temperatures so that the cooling curve does not cut into the “nose” of the I-T diagram, what will the resultant microstructure be?arrow_forward
- Q1: Austenitized 40 mm diameter 5140 alloy steel bar is quenched in agitated oil. Predict what is the Rockwell hardness of this bar will be at (a) its surface and (b) its center (c) What do you think about the difference in hardness number between the center and surface (d) Differentiate between hardness and hardenability (e) Rank the steels in the figure below from lowest to highest hardenability and explain why. Cooling rate at 700°C (°C/sec) 300 150 011/3 55 100 600 Bar diameter (mm) 80 60 40 20 0 OLL 0 0 ww 25 12.5 8 5 S -------------- M-R 10 3/4-R Agitated oil 15 20 1/4 3/4 Distance from quenched end. De (Jominy distance) 5.5 4 3 Bar diameter (in.) 0 25 mm 1 in. Hardness (Rockwell C) Where (C = center, S = surface, M-R mid-radius) 65 60 55 50 45 40 35 30 25 20 15 10 0 10 1 20 Distance from quenched end (mm) 5140 1 30 L 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Distance from quenched end (sixteenths of an inch) 4340 40 9840 4140 8640 50arrow_forwardQ1: Austenitized 40 mm diameter 5140 alloy steel bar is quenched in agitated oil. Predict what is the Rockwell hardness of this bar will be at (a) its surface and (b) its center (c) What do you think about the difference in hardness number between the center and surface (d) Differentiate between hardness and hardenability (e) Rank the steels in the figure below from lowest to highest hardenability and explain why. 600- Bar diameter (mm) 100 80 60 40 20 0 300 0 Cooling rate at 700°C (°C/sec). -150 55 0 تنا 25 ------- 5 S 10 12.5 8 M-R L 1/2 34-R Agitated oil 15 20 ¼ ¾ Distance from quenched end. De (Jominy distance) 5,5 54 Car Bar diameter (in.) 0 25 mm. 1 in. Hardness (Rockwell C) Where (C = center, S = surface, M-R = mid-radius) 2828 292 65 60- 55- 50 45 40 35 30 25 20 15 10 0 J 10 5140 30 20 Distance from quenched end (mm) 4340 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Distance from quenched end (sixteenths of an inch) 40 9840 4140 8640 50arrow_forwardDefine eutectic, eutectoid and peritectic reactions with the examplesarrow_forward
- Explain the phases shown in the attached image of a stress strain cureve for 0.15% carbon steelarrow_forwardUse the following TTT Diagram for the following questions: 800 A 1400 -Eutectoid temperature 700 1200 600 1000 500 800 400 600 300 Mistart) 200 50% 400 M+A M(50%) M(90%) 100 200 10-1 10 102 103 10 105 Time (s) Temperature ("C) Termperature (°F)arrow_forwardFor a 50-50 Mg-Pb alloy, what would the percent of each phase be at 500°C, 300°C and 100°C?arrow_forward
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