Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 9.13, Problem 95SEP
To determine
For eutectoid steel, Figure 9.24, the upper bainite microstructure has larger
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If a eutectoid steel sample is heated to 800°C and then quenched in a cold-water bath then
what would be the possible microstructure? Draw the microstructure and label it.
(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?
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.
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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- What is the% C ratio of two different steels with 80% and equal austenite content at 724 C? please explain how to calculatearrow_forwardWhat is the% C ratio of two different steels with 80% and equal austenite content at 724 Celsius?arrow_forwardQuestion-5 (a) Describe the structural changes that take place when a 0.4%-C plain-carbon steel is slowly cooled from the austenitic region just above the upper transformation temperature. (b) What is a binary eutectic alloy system? Mention all important points. Give some examples.arrow_forward
- 3.The TTT diagram of a plain carbon steel is given in Fig. 1. Identify whether this steel is a hypoeutectoid, eutectoid or hypereutectoid steel. Explain why the transformation happens slowly at 850°C as well as at 300°C. Determine the microstructures expected in this type of steel after the following heat treatment processes. a) Austenize at 900°C, quench to 400°C and hold for 1000 s and quench to 25°C. b) Austenize at 900°C, quench to 25°C. c) Austenize at 900°C, quench to 675°C and hold for 1 s, quench to 400°C and hold for 900 s and slowly cool to 25°C. 900 Acm Cs 800 A1 FezC + Y 33 Fe3C + pearlite 45 700 Ps 600 ++ Fe3C + pearlite Y+ bainite Bs 500 46 Bainite 400 Yu Bf 300 57 Ms 200 60 Mf Y+ martensite 100 62 Martensite 102 65 103 104 105 106 0.1 1 10 Time (s) Fig. 1 Temperature (°C) Rockwell C hardnessarrow_forwardDraw Fe-C binary phase diagram and discuss martensitic transformation for 0.1C% and 0.5C% plain carbon steels.arrow_forwardUsing the TTT diagram for eutectoid steel, draw the specified cooling path on the diagram. Indicate what phases you expect in the final product with percentage of each phase. Assume the material has been fully austenitized before cooling. a. Water cool to room temperature b. Hot quench in molten salt to 690°C and then cooled isothermally for 2 hours: c. Hot quench to 610°C hold 3 minutes and water quencharrow_forward
- Problem 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_forwardExcellent 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 diegram below in your answer Answer: Tie ReckvellChndrearrow_forwardWhat is the% C ratio of two different steels with 80% equal and equal austenite content at 724 C?arrow_forward
- Determine the quenching and normalizing process temperatures of 2 different steels containing 0.6% C and 1.3% C (Ac3 and Acm will be considered linear)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(b) Figure Q4 (b) displays the time-temperature cooling paths for a 1080 steel on an isothermal transformation diagram. Start with the steels in the austenitic condition at time = 0 and 850°C. Interpret the final microstructures that will be obtained for paths (i, ii and iii) shown in the figure. 700 600 500 400 300 (iii) Ms 200 (i) (ii) Mf Figure Q4 (b)arrow_forward
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