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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2011/
Material Science
Module Code: MECH
School: Mechanical & Process Engineering
Programme Title: BSc (Hons) Sustainable Energy
Programme Code: ESENT_8_Y
External Examiner(s): Mr. Paul Kenny, Mr. Conor Buckley Internal Examiner(s): Michael P O’Mahony
Instructions: Answer THREE questions
Duration: 2 Hours
Sitting: Winter 2011
Requirements for this examination:
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator.
Q
(a) Define the following terms: (8 Marks) Phase Alloy Substitutional solid solution Interstitial Solid Solution
(b) For a 40%wt Sn-60%wtPb alloy shown in Fig Q at 150oC What phases are present? (2 marks) What are the composition of the phases? (4 Marks) Calculate the mass fraction. (4 Marks)
(c) A Cu-Ni alloy that is subjected to “NON-EQUILIBRIUM” cooling may have a CORED structure, Explain what this means. (8 Marks)
(d) The modulus of Elasticity, E (Young’s Modulus) is a property for a material, explain the meaning of this property. ( 7 Marks)
Q
(a) Describe the microstructure for EACH of the following plain carbon steels:
0.8% Carbon steel cooled slowly from 800oC to room temperature (3 Marks) 0.4% Carbon cooled slowly from 900oC (3 Marks) 1.0% carbon heated to 900oC and quench in Water (3 Marks) 1.0% carbon heated to 900oC quench in water, re heated to 400oC for an hour and allowed to cool in air (3 Marks)
Comment on the expected hardness of each of the above, after the heat treatment. (4 Marks)
(b) Define the term HARDENABILITY. (6 Marks)
(c) Using diagrams as appropriate, write a brief note on the “Jominy End-Quench Test”. Explain the purpose of the test, and the information obtained from it. (11 Marks)
