the transformation of a hypereutectoid plain-carbon
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Briefly describe the transformation of a hypereutectoid plain-carbon steel (0.4 percent C) with slow cooling.
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- Question-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.What is the microstructure that will be formed after heat treatment of steel containing 1.4 carbon ratio with normalization and air cooling? support with phase diagram and TTT diagrams.Draw Fe-C binary phase diagram and discuss martensitic transformation for 0.1C% and 0.5C% plain carbon steels.
- To what temperature should hypoeutectoid plain carbon steel be heated for hardening purposes according to the iron carbon diagram?1- Describe, with using necessary diagrams, the structure of plain carbon steel (0.25% C). 2- explain the heat treatment and quenching process of plain carbon steel.What is the% C ratio of two different steels with 80% and equal austenite content at 724 Celsius?
- 1. Given the time-temperature transformation diagram, what would be the phases present for a 1.13 wt. % C steel with no alloying elements. calculate the amount of pro eutectoid product, where applicable (at the bottom) A) quenched in cold water to 650 C in 0.1 seconds, then held at 650 C for 5 seconds, then quenched to 400 C, held at 400C for 60 seconds, and finally quenched to room temperature B. Necessary Steel Phase Diagram Calculations to determine the amount of pro eutectoid product:Using 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 quenchA plain carbon steel contains 45 wt.% proeutectoid ferrite. What is the average carbon content in weight percent?
- Part C. Which type of phase transformation is important in heat treatment of steels? (circle one)Peritectic Eutectic Eutectoid Incongruent meltingAt what temperature and overall composition wt% C, does it occur?Write the reaction equation for this transformation, and briefly describe the nature of each of the three important phases that are involved.(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?What is the marcosopic structure of metallic in low carbon and then high carbon steels .