PLO4, CLO3, C4
P1. It is desired to begin with a plain carbon steel (eutectoid composition) as it is economical to make agricultural parts of
200HB and formability is desirous so minimum ductility upto 25%RA. Please recommend material and treatment
preferably with given composition if not suggest alternative. Explain the use of TTT/Phase diagram and combination of
phases (for maximum 20 people).
P2. It is desired to begin with a eutectoid steel, and reach a combination
(a) 900 MPa and 30%RA
(b) 700 MPa and 25%RA, please recommend material and treatment preferably with given composition if not suggest
alternative. Explain the use of TTT/Phase diagram and combination of phases (for maximum 20 people).
P3. It is desired to begin with a eutectoid steel, it is desirous to reach a combination
(a) 680 HB and ~0%RA
(b) 260 HB and 20%RA; , please recommend material and treatment preferably with given composition if not suggest
alternative. Explain the use of TTT/Phase diagram and combination of phases (for maximum 20 people).
P4. A cylindrical piece of steel 38 mm (11.2 in.) in diameter is to be quenched in moderately agitated oil. Surface and
center hardnesses must be at least 50 and 40 HRC, respectively. Which of the following alloys satisfy these requirements:
1040, 5140, 4340, 4140, and 8640? Justify your choice(s). Explain the use of TTT/Phase diagram and combination of
phases (for maximum 20 people).
P5. (a) An iron hook of 1080 steel that has been water quenched, estimate the tempering time at 535oC
to achieve a hardness of 45 HRC, as the manufacturer is bound to heat the specimen to mentioned temperature with a
batch of different items.
(b) There is another batch of heat treatment at 425oC, what will be the tempering time at 425oC
necessary to attain the same hardness?
Explain the use of TTT/Phase diagram and combination of phases (for maximum 20 people).
P6. A through hardened gear is to be made with steel (4340) is to be used in an application requiring a minimum tensile
strength of 1514.5 MPa and a minimum ductility of 39.5%RA. Oil quenching followed by tempering is to be used. Briefly
describe the tempering heat treatment.
Explain the use of TTT/Phase diagram and combination of phases (for maximum 20 people).
P7. An OEM gets an order to deliver a steel with minimum yield strength of 1240 MPa (180,000 psi) and a ductility of at
least 50%RA. Is it possible to produce meet the requirement with oil-quenching and tempering of 4340 steel? If it is not
possible, then explain why.
Explain the use of TTT/Phase diagram and combination of phases (for maximum 20 people).
P8. A cylindrical piece of steel 49.5 mm (2 in.) in diameter is to be quenched in moderately agitated water. Surface and
center harnesses must be at least 50 and 40 HRC, respectively. Which of the following alloys satisfy these requirements:
1040, 5140, and 8660? Justify your choice(s).
Explain the use of TTT/Phase diagram and combination of phases (for maximum 20 people).
Note: Please, make 5 person’s group solve the problem make a report.
Using the rubrics below:
Rubrics for Assessment
Criteria Excellent Good Satisfactory Poor Weightage
5 4 3 1-2
Understanding Understood the Did estimate Understood the Poor 25%
the problem assigned well the topic but the understandin
problems, scope of study was not g of the topic
planned well the work and enough to
to which extent planned support the
literature search experimenta experimentatio
needs to be l scheme n and extract
done good results
development of Literature Literature Basic literature poor 25%
strategies/ survey was in survey was survey was literature
Literature Survey line with topic good just to good but did survey
assigned and make the not cover
could devolve object and experimentatio
into get some n procedures
experimentation clue about and outcomes
the topic
Project Report Proper report Good report Average report Poor report 25%
editing and editing and editing and editing, no
references, references, references, references,
excellent good brief results and
explanation of explanation explanation of experimental
results and of results results and part not
experiment, and experiment, properly
proper experiment, average explain, poor
introduction, good introduction, introduction,
abstract and introduction, abstract and abstract and
conclusion abstract and conclusion conclusion
conclusion
