Question 5Briefly describe how a medium-carbon steel may be processed to achieve each of the followingmicrostructures:(a) Ferrite and pearlite(b) Martensite(c) Tempered martensite(d) Bainite(e) Spheroidite

Step 1: To achieve various microstructures in medium-carbon steel, specific heat treatments and…

Answered: Question 5 Briefly describe how a…

Welding: Principles and Applications (MindTap Course List)

8th Edition

ISBN:9781305494695

Author:Larry Jeffus

Publisher:Larry Jeffus

Chapter27: Weldability Of Metals

Section: Chapter Questions

Problem 17R: Why must cracks in the martensite layer of high-manganese steels be removed?

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Use the TTT diagram for O1 Tool steel provided above to estimate the amounts ofpearlite and martensite formed in the quenched heat-treated samples.
4
4-Transformation in eutectoid steels is named as a. Austenitizing b. Carburizing c. Decarburizing d. Nitriding 5-Which of the following types of cast iron includes black flakes of graphite in it? a. White cast iron b.Grey cast iron c. Ductile cast iron d.Malleable cast iron 6- Nodules of graphite are observed in the microstructure of a. White cast iron b. Malleable cast iron c. Spheroidal cast iron d. All of the above.
What is the composition (wt% C) of a steel with AISI designation 1090? .Would this be considered a low, medium, or high carbon steel? (circle one)
Question-6 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.
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How do ferrite and cementite work together to form a strong ductile steel?
Why must cracks in the martensite layer of high-manganese steels be removed?
19th is first priority.
3-Miled steel can be converted into high carbon steel by which of the following heat treatment process: a- Normalizing b- Annealing c- Nitriding d- Case hardening 4-Which one of the following is the solid carburizing material: a-Charcoal b-NH4 c-NaOH d-CH4
The TTT diagram for a 1076 eutectoid steel is given: What is the heat treatment process to form 50% Coarse Pearlite + 50% Martensite. 800 A 1400 Eutectoid temperature 700 A 1200 600 1000 500 800 400 A 600 300 M(start) 200 50% 400 M + A M(50%) M(90%) 100 200 10-1 1 10 102 103 104 105 Time (s) Temperature (°C) Temperature (°F)
(c) The steels with the following compositions are heat treated and the results of microstructures are indicated in Table 2(c). Table 2(c): Heat treated steels and the results of microstructures Steel A 0.35 wt% C Coarse Pearlite Steel B 0.25 wt% C Coarse Pearlite Steel C 0.35 wt% C Fine Pearlite Rank the above steels based on carbon content and microstructures from the highest to the lowest hardness with justification.

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