Describe the microstructure present in a 1050 steel after each step in the following heat treatments (briefly stating the assumptions and reasons): (a) heat at 820°C, quench to 650°C and hold for 90 s, and quench to 25°C; (b) heat at 820°C, quench to 450°C and hold for 90 s, and quench to 25°C; (c) heat at 820°C, quench to 720°C and hold for 100 s, and quench to 25°C; (d) heat at 820°C, quench to 720°C and hold for 100 s, quench to 400°C and hold for 500 s, and quench to 25°C; (e) heat at 820°C, quench to 720°C and hold for 100 s, quench to 400°C and hold for 10 s, and quench to 25°C; (f) heat at 820°C, quench to 25°C, heat to 500°C and hold for 103 s, and air cool to 25°C. (g) Do alloying elements shift the position of TTT curves? Which way and why? (h) Are CCT curves shifted with respect to TTT curves? Which way and Why?

Describe the microstructure present in a 1050 steel after each step in the following heat treatments (briefly stating the assumptions and reasons): (a) heat at 820°C, quench to 650°C and hold for 90 s, and quench to 25°C; (b) heat at 820°C, quench to 450°C and hold for 90 s, and quench to 25°C; (c) heat at 820°C, quench to 720°C and hold for 100 s, and quench to 25°C; (d) heat at 820°C, quench to 720°C and hold for 100 s, quench to 400°C and hold for 500 s, and quench to 25°C; (e) heat at 820°C, quench to 720°C and hold for 100 s, quench to 400°C and hold for 10 s, and quench to 25°C; (f) heat at 820°C, quench to 25°C, heat to 500°C and hold for 103 s, and air cool to 25°C. (g) Do alloying elements shift the position of TTT curves? Which way and why? (h) Are CCT curves shifted with respect to TTT curves? Which way and Why?

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

In your own words describe the following heat treatment procedures for steels and, for each, the intended final microstructure: (a) full annealing (b) normalizing (c) quenching (d) tempering.
a) Briefly explain what is meant by the following: i. Cold-working, ii. Hot-working b) Briefly explain the following as applied to heat treatment of plain carbon steels: i. Hardening ii. Annealing iii. Tempering iv. Normalizing c) Estimate the recovery temperature for a cold worked sheet metal if its melting temperature is taken as 1080 degrees Celsius
What does the process of temper drying do for hardened carbon steel?
How would the following heat treatment be conducted, quoting approximates temperatures, cooling rate and microstructure of:(i) Normalizing of a plain carbon steel containing 0.8 wt % C, (ii) Quenching of a plain carbon steel containing 0.8 wt % C in water (iii) Quenching of a plain carbon steel containing 0.8 wt % C in oil (iv) full annealing of a plain carbon steel containing 0.8 % C.
What is quenching? Why should quenched steel be tempered?
1. Why does the tensile strength of steel, which contains only austenite at room temperature, differ fromsteel that shows only pearlite in its microstructure? Give two important reasons for the difference. 2. What general prerequ_isites exist for the formation of martensite in steel? 3. What is an isothermal transformation of a material in the solid state condition? 4. Draw a typical isothermal transformation diagram for plain .carbon eutectoid steel and indicate thevarious decomposition products expected by simple diagrammatic drawing.
Briefly explain the heat treatment steps of a tool steel by use of proper drawings and explainwhy multiple tempering is applied during heat treatment?
In a eutectoid steel the following microstructures are required for different application. Suggest cooling rate and sequences to achieve them. a) 50% Pearlite and 50% Bainite b) 50% Bainite and 50% Martensite c)100% fine Pearlite d) 100% Martensite e) 50% Peralite and 50% Martensite
Explain the connection between notch strengthening and material ductility; which is more likely to notch strengthen––pure Al or martensitic steel?
3. What effects do the alloying additions have on the microstructure and mechanical properties of air-cooled (normalized) steel specimens? 1 4. What effects do the alloying additions have on the microstructure and mechanical properties of furnace-cooled (annealed) steel specimens?
Some alloys use a combination of strain hardening and precipitation hardening to achieve particularly high strength levels. The usual order of strengthening is solution treatment, quenching, cold working, and finally precipitation heat treatment. Why not reverse the order of the cold working and precipitation heat treatment steps?
A 1070 steel is heated to the austenite region and air cooled. Calculate the hardness of this steel. Sketch the final microstructure...