P3. It is desired to begin with a eutectoid steel, it is desirous to reach a...

P3. It is desired to begin with a eutectoid steel, it is desirous to reach a combination

(a) 680 HB and ~0%RA

(b) 260 HB and 20%RA; , please recommend material and treatment preferably with given composition if not suggest alternative. Explain the use of TTT/Phase diagram and combination of phases

Solutions

Expert Solution

Solution:

If you found this solution useful then please upvote

Thank you

Part A

Refer to above figures a martensitic material has a percentage of 0.6% at a hardness of 680.
From we see that a martensitic material must have a cooling rate of at least 140° C/s.

Part B

Refer to Figure We see that only fine pearlite has a hardness of at least 260 at 0.7%. C.
However a 20%. RA for fine pearlite requires 0.75%. From Figure we see that a fine pearlite must have a cooling rate less than 35° C/s

samet mamat answered 7 months ago

Next > < Previous

Related Solutions

Consider the same TTT diagram and phase diagram for a eutectoid steel. TTT If a specimen...

Consider the same TTT diagram and phase diagram for a eutectoid steel. TTT If a specimen of this steel is solutionized (aka, annealed to equilibrium) at 800°C, rapidly cooled to 300°C and is held at 300°C for 10 seconds, and is then quenched to room temperature, what constituents will make up the final microstructure? a. Bainite and Martensite b. Pearlite c. Martensite d. Austenite and Martensite e. Austenite f. Pearlite and Martensite g. Austenite and Pearlite h. Bainite

In a metallurgy TTT diagram plain carbon steel, pearlite 50% is reached. Is this eutectoid, hypo,...

In a metallurgy TTT diagram plain carbon steel, pearlite 50% is reached. Is this eutectoid, hypo, or hyper and why. Also what is its composition and designation of the alloy.

For a eutectoid steel, describe isothermal heat treatments that would be required to yield specimens having...

For a eutectoid steel, describe isothermal heat treatments that would be required to yield specimens having the following tensile strength-ductility (%RA) combinations: (a) 900MPa and 30% RA (b) 700MPa and 25% RA

For eutectoid steel: b) Sketch the thermal history (i.e., path) and calculate the final microstructure when...

For eutectoid steel: b) Sketch the thermal history (i.e., path) and calculate the final microstructure when the steel has the following heat treatment sequence : i) instantaneously quenched from 850 C to 300 C, ii) held at 300 C for 1 hour, and iii) air cool to 20 C. (Materials science)

Subjects