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Chapter 9: Problem 41

What is the principal difference between congruent and incongruent phase transformations?

Short Answer

Expert verified
Answer: The principal difference between congruent and incongruent phase transformations lies in the overall chemical composition change occurring during the transformation process. In congruent phase transformations, the overall chemical composition remains the same before and after the phase change, whereas in incongruent phase transformations, the chemical composition of the initial and final phases are different due to the net exchange of atoms or ions between the phases.

Step by step solution

01

Define Congruent Phase Transformation

In a congruent phase transformation, the phase change occurs without any change in the overall chemical composition of the system. The initial and final phases have the same compositions, and there is no net exchange of atoms or ions between them. This transformation takes place by the rearrangement of atoms in the crystal structure, without any diffusion process.
02

Define Incongruent Phase Transformation

In an incongruent phase transformation, the process involves a change in the overall chemical compositions of the initial and final phases. During this type of transformation, the rearrangement of atoms in the crystal structure is accompanied by the diffusion of atoms or ions, resulting in the net exchange of species between the phases, leading to different compositions for the initial and final phases.
03

Principal Difference Between Congruent and Incongruent Phase Transformations

The principal difference between congruent and incongruent phase transformations lies in the overall chemical composition change occurring during the transformation process. In congruent phase transformations, the overall chemical composition remains the same before and after the phase change, whereas in incongruent phase transformations, the chemical composition of the initial and final phases are different due to the net exchange of atoms or ions between the phases.

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Most popular questions from this chapter

The mass fractions of total ferrite and total cementite in an iron-carbon alloy are \(0.88\) and \(0.12\), respectively. Is this a hypoeutectoid or hypereutectoid alloy? Why?

It is desirable to produce a copper-nickel alloy that has a minimum noncold- worked tensile strength of \(350 \mathrm{MPa}(50,750 \mathrm{psi})\) and a ductility of at least \(48 \%\) EL. Is such an alloy possible? If so, what must be its composition? If this is not possible, then explain why.

Consider \(1.0 \mathrm{~kg}\) of austenite containing \(1.15\) wt \(\%\) C, cooled to below \(727^{\circ} \mathrm{C}\left(1341^{\circ} \mathrm{F}\right)\). (a) What is the proeutectoid phase? (b) How many kilograms each of total ferrite and cementite form? (c) How many kilograms each of pearlite and the proeutectoid phase form? (d) Schematically sketch and label the resulting microstructure.

Construct the hypothetical phase diagram for metals \(A\) and \(B\) between temperatures of \(600^{\circ} \mathrm{C}\) and \(1000^{\circ} \mathrm{C}\) given the following information: \- The melting temperature of metal \(A\) is \(940^{\circ} \mathrm{C} .\) \- The solubility of \(\mathrm{B}\) in \(\mathrm{A}\) is negligible at all temperatures. \- The melting temperature of metal \(\mathrm{B}\) is \(830^{\circ} \mathrm{C}\). \- The maximum solubility of \(\mathrm{A}\) in \(\mathrm{B}\) is 12 wt \(\%\) A, which occurs at \(700^{\circ} \mathrm{C}\). \- At \(600^{\circ} \mathrm{C}\), the solubility of \(\mathrm{A}\) in \(\mathrm{B}\) is \(8 \mathrm{wt} \% \mathrm{~A}\). \- One eutectic occurs at \(700^{\circ} \mathrm{C}\) and \(75 \mathrm{wt} \%\) B- \(25 \mathrm{wt} \% \mathrm{~A}\) \- A second eutectic occurs at \(730^{\circ} \mathrm{C}\) and 60 \(\mathrm{wt} \% \mathrm{~B}-40 \mathrm{wt} \% \mathrm{~A}\). \- A third eutectic occurs at \(755^{\circ} \mathrm{C}\) and 40 \(\mathrm{wt} \%\) B-60 wt \(\% \mathrm{~A}\). \- One congruent melting point occurs at \(780^{\circ} \mathrm{C}\) and \(51 \mathrm{wt} \%\) B-49 wt \(\% \mathrm{~A}\). \- A second congruent melting point occurs at \(755^{\circ} \mathrm{C}\) and \(67 \mathrm{wt} \%\) B-33 wt \(\% \mathrm{~A}\). \- The intermetallic compound \(\mathrm{AB}\) exists at \(51 \mathrm{wt} \%\) B-49 wt \% A. \- The intermetallic compound \(\mathrm{AB}_{2}\) exists at \(67 \mathrm{wt} \%\) B-33 wt \(\% \mathrm{~A}\).

(a) What is the distinction between hypoeutectoid and hypereutectoid steels? (b) In a hypoeutectoid steel, both eutectoid and proeutectoid ferrite exist. Explain the difference between them. What will be the carbon concentration in each?
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