GUJARAT TECHNOLOGICAL UNIVERSITY
SEMESTER-VI(NEW) — EXAMINATION - SUMMER 2019
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Subject Code:2162107 Date:16/05/2019Subject Name:Heat Treatment
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.
Q.1 (a) With neat sketch draw TTT diagram for hypereutectoid steel. 03
(b) Define Heat treatment. List out heat treatment processes. 04
(c) What is hardenability? Explain hardenability measurement by Jominy End Quench test. 07
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Q.2 (a) What is Critical Cooling Rate? 03
(b) How does the continuous cooling diagram (CCT) differ from the isothermal transformation diagram? 04
(c) Discuss Bain distortion model. 07
OR
(c) Explain mechanism of pearlitic transformation with neat sketch. 07
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Q.3 (a) Why is hardening followed by tempering treatment? 03
(b) Write a short note on thermo mechanical treatment. 04
(c) Differentiate Annealing and Normalizing heat treatment processes. 07
OR
Q.3 (a) Discuss different Characteristics of Quenchants. 03
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(b) Describe the plasma nitriding techniques. 04(c) Write a note on tempering. 07
Q.4 (a) Write a note on secondary hardening. 03
(b) Write a note on patenting. 04
(c) Write a note on malleablizing annealing 07
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OR
Q.4 (a) Write a note on temper embrittlement. 03
(b) Explain the sub-zero treatment with its need. 04
(c) List out Austenitic grain size measurement techniques? Explain any one method. 07
Q.5 (a) Discuss heat treatment of Austempering. 03
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(b) Explain induction hardening. 04(c) List defects in heat treated parts and discuss with causes and remedies. 07
OR
Q.5 (a) What is the purpose of Spherodized Annealing? 03
(b) Discuss age-hardening heat treatment for Al-Cu alloys. 04
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(c) What are different methods of case carburizing and give its need? Explain pack carburizing by coal. 07--- Content provided by FirstRanker.com ---
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