Download GTU BE/B.Tech 2018 Winter 6th Sem New 2162107 Heat Treatment Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VI (NEW) EXAMINATION - WINTER 2018

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Subject Code:2162107 Date:27/11/2018
Subject Name:Heat Treatment
Time: 02:30 PM TO 05:00 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) What is Heat treatment? Enlist heat treatment processes. 03
(b) Briefly explain spherodized annealing. 04

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(c) How formation of austenite on heating is done for eutectoid 07
steel ? Explain it.

Q.2 (a) Differentiate between Hardness and Hardenability. 03
(b) Differentiate between upper and lower Bainite. 04
(c) Explain Hull — Mehl model for pearlitic transformation. 07

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OR
(c) Discuss Bain distortion model. 07

Q.3 (a) List out all Annealing process. Explain full Annealing. 03
(b) Short note on thermo mechanical treatment 04
(c) Explain time temperature transformation (TTT) diagram. 07

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OR
Q.3 (a) Write note on Retained Austenite. 03
(b) Write Austenitic grain size measurement techniques? Explain 04
any one method
(c) What is hardenability? Explain hardenability measurement by 07

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Jominy End Quench test.

Q.4 (a) “Hardening is followed by tempering treatment “Justify . 03
(b) Define Annealing, normalizing; hardening and tempering. 04
(c) Explain Austempering . 07
OR

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Q.4 (a) Discuss different Characteristics of Quenchants. 03
(b) Discuss induction hardening as method of surface hardening. 04
(c) What are different methods of case carburizing and give its 07
need? Explain pack carburizing by coal.

Q.5 (a) Explain heat treatment of any plain carbon steel. 03

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(b) Discuss heat treatment of any low alloy steel. 04
(c) Explain HSS tool steel heat treatment. 07
OR
Q.5 (a) Describe the nitriding techniques. 03
(b) List out defects in heat treated parts. Explain any one with 04

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causes and remedies.
(c) Discuss heat treatment of Cu alloys. 07

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