Assignment Guidelines for Material Selection Process

Late Submission Policy

Drawings can be done by hand or electronically. They can either be scanned / copied into your Word or pdf document.

Any assignment submitted late, but within 5 working days of the deadline, will be given a maximum mark of 50%. Assignments submitted more than 5 working days after the deadline will not be marked, and a mark of 0% will be recorded.

Students with special needs will be addressed on individual basis. (Candidates that may require any special requirement will be dealt with on a one-on-one

basis which must be discussed with the module tutor/lead before the due date).

1. Able to communicate effectively on material selection with material scientists

2. Able to understand the implications of different modes of material failure

3. To understand the effects of composition and heat treatment on the properties of different types of material

4. To select materials to minimise the likelihood of component failure

You have to document the whole selection process.

You will have to decide your own dimensions for the panel and the constraints.

20 percent of the total mark for this question will be assessed for the clear definition of the problem and for writing down the necessary equations used in the problem.

30 percent of the total mark for this question will be assessed for the derivation of the material index with correct material performance equation.

20 percent of the total mark for this question will be assessed for finding the coupling line with two performance indexes.

30 percent of the total mark for this question will be assessed to the use of CES EduPack for the material selection.

You will need to decide extra constraints and find out the equations for a column. You will need to decide your objective and to compare the results with real world materials. You will need to translate the problem, derive the performance index or indexes, select some screening constraint and select the actual material graphically. You have to document the whole selection process.

You may select materials with minimum mass or minimum cost or both as your objective. You will have to decide your own dimensions for the column and the constraints.

20 percent of the total mark for this question will be assessed for the clear definition of the problem and for writing down the necessary equations used in the problem

40 percent of the total mark for this question will be assessed for the derivation of the material index with correct material performance equation.

40 percent of the total mark for this question will be assessed to the use of CES EduPack for the material selection.

Reminder, as it is an open exercise, each student is expected to have a unique solution as definition of the problem will be unique.

Draw the Time Temperature Transformation T-T-T diagram for plain carbon steel of eutectoid composition and show on the diagram the critical cooling curve, the transformation lines, the phases, the axis.

Explain the change of structure with martensitic transformation

Discuss with help of simple sketch along with two examples of the phase diagram (binary system) in which each of the reaction occur during the phase transformation of metals.

Describe the phase reaction and the corresponding temperature for the selected examples

(i) Peritectic reaction and Peritectic point

(ii) Eutectic reaction and Eutectic point

With the help of T-T-T diagram for eutectoid plain carbon steel answered in part (a) explain following parts

(i) Explain the process to quench a component to obtained full retained austenite. Indicate the temperature and times needed in the process.

(ii) What are the phase or phases resultant from the following process? Keeping a component made of eutectoid plain carbon steel at 750 °C for one hour and then cooling it to 450 °C temperature in 1 second, keeping it at that temperature for 10 seconds and cooling it to room temperature in another 10 seconds.

(iii) What are the phase or phases resultant from the following process? Keeping a component made of eutectoid plain carbon steel at 750 °C for one hour and cool it down to 300 °C, keeping it at that temperature for 10 seconds and cooling it to room temperature in another 10 seconds.