GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019
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Subject Code: 2182115 Date:13/05/2019Subject Name: Alloy Design
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Draw flow chart of interrelationship among design, materials and 03 processing.
(b) What is degree of freedom? Write the formula for degree of 04 freedom for unary and binary phase diagram along with the justification.
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(c) Explain the different steps involved in the engineering design 07 process? Q.2 (a) Explain briefly the effect of size, shape and distribution of second 03 phase on mechanical properties of alloys
(b) Discuss the various advantages offered by Dual Phase Steel 04 compared to Plain Carbon steel.
(c) Stent manufacturer has contacted you to design a bio-degradable 07 metallic alloy. Give your recommendations based on properties required at the application level and justify the choice of materials.
OR
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(c) Stent manufacturer has contacted you to design a non-degradable 07 metallic alloy. Give your recommendations based on properties required at the application’level and justify the choice of materials. Q.3 (a) What are the driving force behind Recovery, Recrystallization and 03 Grain Growth?
(b) Draw a labeled diagram of cooling curves of: 04
1) Eutectic alloy and
2) Hyper eutectic alloy
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(c) What is precipitation hardening? Explain different stages and 07 mechanisms of precipitation hardening by coherent particles using Al — 2wt%Cu alloy.OR
Q.3 (a) What are the prerequisites for an alloy to be age-hardenable? 03
(b) Draw a labeled diagram of cooling curves of: 04
1) Pure metal and
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2) Hypo eutectic alloy(c) Explain Recovery, Recrystallization and Grain Growth. 07 Schematically show the effect of this phenomenon on the mechanical properties of a material.
Q.4 (a) What is Fatigue? Show S-N diagram for various ferrous & non 03 ferrous alloys.
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(b) Explain constitutional supercooling in an alloy. 04(c) What do you understand by creep failure? Explain the mechanisms 07 involved in creep failure of a material?
OR
Q.4 (a) With help of flow chart give detailed classification of phase 03 transformations.
(b) Draw labeled diagram of: 04
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1) Stress Strain Diagram and2) Creep Curve
(c) What are the ways to reduce wear of material? What are the 07 fundamental criteria for selection of the material for wear applications?
Q.5 (a) Suggest the materials for high dynamic loading conditions. 03
(b) Explain the strengthening mechanism behind the high temperature 04 strength of Nickel based Superalloys.
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(c) List the computer-based methods used for designing of alloys. 07 Explain any one in detail.OR
Q.5 (a) State the difference between Alloy & Composites. 03
(b) Which are the principal alloying elements of group-M HSS? List 04 the effects of these elements on properties of group-M HSS.
(c) Explain the advantages of designing a component from 07 lightweight and high strength aluminium based alloy made using powder metallurgical route? List probable applications for the same.
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