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- Using the TTT diagram, explain how you can get the following: (explain by mentioning detailed heat treatment by showing each heat treatment alone in order shown)1. Fine pearlite2. Coarse pearlite3. MartensiteComparison of treatment processes (annealing, normalizing, hardening and tempering) according to heating and cooling, microstructure and mechanical propertiesAre there any procedures to prevent grain growth of heat affected zone (HAZ)?
- 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)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.(b). Describe with the aid of an illustration, heat treatment procedures for steels and state the intended final microstructure. (i).Full annealing (ii)Normalizing (in). Tempering
- 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) and the last one. thanks for ur helping.QUESTION 5 Using the continuous-cooling transformation diagram for a eutectoid Fe-C alloy shown below, perform the following tasks. (a) Plot the cooling curve (rough position) corresponding to normalising treatment, and specify the microstructure obtained. (b) Plot the cooling curve (rough position) corresponding to full annealing, and specify the microstructure obtained. (c) Design a heat treatment to produce a duplex microstructure of about half pearlite and half tempered martensite, specifying all the steps and plotting, roughly, the cooling curve involved. (d) If a full (i.e. 100%) tempered martensitic microstructure is desirable, describe the conditions for achieving it in terms of both cooling rate and sample size. (e) What treatment do you propose to do if a fully annealed steel is still too hard for processing (e.g. forging)? Plot the microstructure after such a treatment, marking any dimension that is important.What are the effects of alloying elements on Fe-C binary phase diagram? And What are the main reactions for molten iron processing in Blast furnace?
- 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 quench1-discribe how manufacturing Process are classified? 2- llustrate the process which work above recrystallization temperature with neat sketch? 3- Discuss the heat treatment process which uses rapid cooling of steel in oil or molten salt bath?the PCS containing 0.4%C was quenched hardened in water, amd tempered at 400oC. sketch and identify the phases of the microstructure pf the stell at rhe following states a) above the upper critical point just before quenching in water b) after quenching I’m water prior to tempering C) after tempering