For the 8660 Steel specify a heat treatment that (state austenitizing step in Ce

Question

For the 8660 Steel specify a heat treatment that (state austenitizing step in Celsius):

A. would maximize ferrite and coarse pearlite in the finished steel

B. would produce a mixed microstructure of 75% fine pearlite and 25% bainite

C. would produce a microstructure that it 25% bainite and 75% tempered martensite

d. Specify a sample thickness to through "quench" the steel

For the 8660 Steel specify a heat treatment that (state austenitizing step in Celsius): A. would maximize ferrite and coarse pearlite in the finished steel B. would produce a mixed microstructure of 75% fine pearlite and 25% bainite C. would produce a microstructure that it 25% bainite and 75% tempered martensite d. Specify a sample thickness to through ''quench'' the steel

Explanation / Answer

a) Isothermal transformations are allowed to occur to obtain coarse pearlite. Decreasing the temperature the carbon diffusion rate decreases which ultimately forms fine pearlite. b) Pearlite: A lamellar eutectoid structure formed upon slow cooling from austenite that is made up of alternating plates of a ferrite and cementite (Fe3C). Bainite: Bainite is a decomposition product of Austenite best developed at interrupted holding temperatures below those forming fine pearlite and above those giving Martensite.

Related Questions

Navigate

• Browse (All)
• Browse F
• Subjects

---