Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 9: Problem 25

(a) Briefly describe the phenomenon of coring and why it occurs. (b) Cite one undesirable consequence of coring.

Short Answer

Expert verified
Answer: Coring is the formation of a hollow cavity or core within a casting during the casting process of materials like metals. It occurs due to differences in cooling rates between the inner and outer sections of the material being cast, with the outer part solidifying faster than the inner part. One undesirable consequence of coring is the reduced structural integrity and strength of the casting, which could lead to a higher risk of failure or breakage under mechanical load or stress. This is particularly concerning in applications where material strength and reliability are crucial, such as automotive or aerospace components.

Step by step solution

01

Understanding Coring

Coring is the phenomenon that occurs during the casting process of materials like metals, where a hollow cavity or a core is formed within the casting. This happens when the internal part of a casting takes longer to solidify than the external part, resulting in a void or hollow cavity inside the casting. The outer part of the material solidifies first, creating a shell, while the inner material continues to shrink and solidify, leaving a hollow space inside.
02

Reason for the Occurrence of Coring

Coring occurs mainly due to the differences in the cooling rates of the inner and outer sections of the material being cast. The outer part of the material, being in contact with the cool mold, solidifies at a faster rate than the inner part. Consequently, the inner part takes longer to solidify, causing the formation of a hollow core as the material contracts.
03

An Undesirable Consequence of Coring

One undesirable consequence of coring is the reduced structural integrity and strength of the casting. Since a hollow cavity is present within the casting, it could lead to a higher risk of failure or breakage under mechanical load or stress. This can have significant implications in applications where the strength and reliability of the materials are crucial, such as in automotive or aerospace components.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Is it possible to have a copper-nickel alloy that, at equilibrium, consists of a liquid phase of composition \(20 \mathrm{wt} \% \mathrm{Ni}-80 \mathrm{wt} \% \mathrm{Cu}\) and also an \(\alpha\) phase of composition \(37 \mathrm{wt} \%\) Ni-63 \(\mathrm{wt} \% \mathrm{Cu}\) ? If so, what will be the approximate temperature of the alloy? If this is not possible, explain why.

Given here are the solidus and liquidus temperatures for the germanium-silicon system. Construct the phase diagram for this system and label each region. $$ \begin{array}{ccc} \hline \begin{array}{c} \text { Composition } \\ (\boldsymbol{w t} \% \text { Si) } \end{array} & \begin{array}{c} \text { Solidus } \\ \text { Temperature }\left({ }^{\circ} \mathrm{C}\right) \end{array} & \begin{array}{c} \text { Liquidus } \\ \text { Temperature }\left({ }^{\circ} \mathrm{C}\right) \end{array} \\ \hline 0 & 938 & 938 \\ 10 & 1005 & 1147 \\ 20 & 1065 & 1226 \\ 30 & 1123 & 1278 \\ 40 & 1178 & 1315 \\ 50 & 1232 & 1346 \\ 60 & 1282 & 1367 \\ 70 & 1326 & 1385 \\ 80 & 1359 & 1397 \\ 90 & 1390 & 1408 \\ 100 & 1414 & 1414 \\ \hline \end{array} $$

The mass fraction of \(e\) utectoid cementite in an iron-carbon alloy is \(0.104\). On the basis of this information, is it possible to determine the composition of the alloy? If so, what is its composition? If this is not possible, explain why.

Two intermetallic compounds, \(\mathrm{AB}\) and \(\mathrm{AB}_{2}\), exist for elements \(\mathrm{A}\) and \(\mathrm{B}\). If the compositions for \(\mathrm{AB}\) and \(\mathrm{AB}_{2}\) are \(34.3 \mathrm{wt} \% \mathrm{~A}-65.7\) \(\mathrm{wt} \% \mathrm{~B}\) and \(20.7 \mathrm{wt} \% \mathrm{~A}-79.3 \mathrm{wt} \% \mathrm{~B}\), respectively, and element \(\mathrm{A}\) is potassium, identify element B.

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.
See all solutions

Recommended explanations on Physics Textbooks

Scientific Method Physics

Read Explanation

Engineering Physics

Read Explanation

Translational Dynamics

Read Explanation

Measurements

Read Explanation

Turning Points in Physics

Read Explanation

Conservation of Energy and Momentum

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free