Mechanical Engineering : Past Year Questions: Phase Diagrams Notes | EduRev
Question 1:The crystal structure of austenite is
y - Austenite has FCC Structure.
Question 2:The binary phase diagram of metals P and Q is shown in the figure. An alloy X containing 60% P and 40% Q (by weight) is cooled from liquid to solid state. The fractions of solid and liquid (in weight percent) at 1250°C, respectively, will be
[ME 2019, Set-2]
Question 3:Denoting L as liquid and M as solid in a phasediagram with the subscripts representing different phases, a eutectoid reaction is described by
[ME 2018, Set-2]
Question 4:In the phase diagram shown in the figure, four samples of the same composition are heated to temperatures marked by a, b, c and d.
Composition (Arbitrary Units)
At which temperature will a sample get solutionized the fastest?
[ME 2016, Set-2]
Question 5:In a binary system of A and B a liquid of 20% A (80% B) is coexisting with a solid of 70% A(30%B). For an overall composition having 40% A the fraction of solid is
[ME 2016, Set-2]
Co = 40%
C1 = 20%
Cs = 70%
Question 6:If a particular Fe-C alloy contains less than 0.83% carbon, it is called
Question 7:The percentage of carbon in grey cast iron is in the range of
Question 8:The iron carbon diagram and the TTT curves are determined under
Under TTT diagram cooling rate is variable.
Question 9:Increase in carbon content in plain carbon steel raise its
As carbon content increases, both tensile strength and hardness increases but ductility and toughness decreases.
Question 10:The process of reheating the martensitic steel to reduce its brittleness without any significant loss in its hardness is
[ME 2014, Set-1]
Question 11:The main purpose of spheroidising treatment is to improve
Improves machinability of high carbon steels.
Question 12:When 1.0% plane carbon steel is slowly cooled from the molten state to 740°C, the resulting structure will contain
The resulting structure will contain Austenite & cementite.