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How to use Knovel to solve the end-of-chapter Knovel problems for Askeland’s widely used Science and Engineering of Materials, 5/E.

How to use Knovel to solve the end-of-chapter Knovel problems for Askeland’s widely used Science and Engineering of Materials, 5/E.

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### Transcript

• 1. Using Knovel to Complete Chapter Exercises
• 4/09
• 2. The basic search is the primary tool used in completing the exercises. To access the basic search, click on the ‘ Search Knovel ’ tab on the left of Knovel’s homepage.
• 3. To learn what various Boolean operators do and to learn some general search tips click on the ‘ search tips ’ tab.
• 4. If the icon appears next to a title in the basic search then it contains an interactive table.
• 5. Shown below is an interactive table. You can filter data, convert units or even export the table in a variety of formats including to an excel sheet.
• 6. Shown below is an equation plotter. The equation plotter is represented by the symbol and is a special interactive graphing applet.
• 7. The icon indicates graph digitizer interactivity. Shown below is a phase diagram being utilized by the graph digitizer function.
• 8. Let’s take a look at the chapter 10 exercise.
• We would like to produce a Sn-Pb composite (commonly known as solder) that has just reached 98 wt% Sn at 423 K (105˚C). Determine the phase type of tin that has just formed at this temperature.
• Suppose a 1000-kg mixture of iron carbide with 0.1 wt% C is held at 1073 K (800˚C). How many kg of carbon can be added to the mixture before any γ forms? How many pounds of carbon must be added to the original mixture to begin forming a γ + Cementite alloy?
• 3)What is the composition of liquid Ag found in a 50 wt% mixture of Ni and Ag at 1273 K (1000˚C)?
• 9. Here we see a graph digitizer for the binary phase diagram of tin and lead. Using it we find that the phase that is formed is βSn.
• 10. We can see on this phase diagram that at 0.1 wt% C in the phase diagram @ 800˚C the phase is α + γ. The maximum allowed carbon content (before reaching a state of only γ phase) is approximately 0.3 wt% C.
• 11. Now we solve for the amount of carbon that can be added before forming the γ phase. Since the original composition is 0.1 wt% C the initial mass of C is: Therefore we can write down the following expression where x is the mass of Carbon that must be added to the mixture to create a 0.3 wt% Iron carbide mixture:
• 12. Solving for the amount of carbon that must be added to the original mixture to get the γ + cementite phase. Now we wish to find the composition of C needed to make the solution completely γ + Cementite. Carefully examining the phase diagram we see that at a temperature of 800˚C a composition of about 0.95 wt% of C would be the threshold of creating a phase of γ + Cementite. Now the question is how much C must be added to the original mixture to obtain this wt %. To do this we solve for x in the following equation (just as in the first section of the question):
• 13. In order to find the liquid Ag composition of such a mixture at the given temperature we must use the lever rule function on the graph digitizer.
• 14. If there are any specific questions about the Knovel content and features try looking at the Knovel help guide.
• 15. Done Already? Knovel can be used as an effective learning tool by providing for fast, useful and creative ways of solving textbook problems.