Metallography

JADAVPUR UNIVERSITY

FACULTY OF ENGINEERING & TECHNOLOGYMechanical Engineering DepartmentMETALLOGRAPHY & MATERIALS LABORATORY

STUDY OF MICROSTRUCTURE OF CAST IRON

EXPERIMENT NO: 303

OBJECTIVE OF THE EXPERIMENT: To prepare the specimen supplied and study the microstructure of Gray C.I, White C.I, SGCI and identify the different constituents present.

SPECIMEN : 1 . Gray C.I. 2. White C.I. 3. Malleable or Spheroidal Graphite (S.G.) Cast Iron.

MICROSCOPE: Make_____________________________________________________ Magnification ______________________________________________

LABORATORY:

1. Follow the complete procedure of polishing and etching. 2. Study the microstructure and identify the constituents present with sketches as observed.

REMARKS:

Submit a neat sketches of iron-carbide equilibrium diagram with all details.

QUESTION:

1. What is eutectic? What is the % of C at which it occurs for C.I.?2. What is the difference between S.G.C.I. & Grey C.I.?3. Can Grey C.I. be hardened? If not why?4. Why is Grey C.I. suitable for machine beds and slides?5. Mention the comparison of GCI, WCI and SGCI. Also mention some of their uses.

Name: __________________________________________________________________________________________Class: ________________________ Section: _______________________ Roll No: ________________________

Date __________________Signature of the Teacher.

JADAVPUR UNIVERSITY


EXPERIMENT NO: 304 STUDY OF MICROSTRUCTURE OF ANNEALED PLAIN CARBON STEEL.

OBJECTIVE OF THE EXPERIMENT: Preparation of the specimen supplied and study of the microstructure.

SPECIMEN : 1 . Annealed plain carbon steel % C = 0.4 % furnace cooled from 750*C 2. Annealed plain carbon steel % C = 0.65% furnace cooled from 750*C 3. Annealed plain carbon steel % C = 1.1% furnace cooled from 750*C

MICROSCOPE: Make _______________________________________________ Magnification ________________________________________

LABORATORY PROCEDURE:

1. Class teacher will assign a particular specimen to a group. They will prepare the specimen and study the microstructure, identify the different constituents and make a neat sketch of each with observation. 2. All the specimen should be studied by each in turn and include in the report.REMARKS: Attach a S-curve with the report.

QUESTIONS: 1. What is full annealing and process annealing? 2. What are the differences between full annealing and normalizing? On a Fe-C diagram show the full annealing and normalizing zone. 3. With respect to time, temperature and cooling rate, state how does homogenizing differ from normalizing. 4. How does the cooling rate affect the microstructure and properties of steel.

Name: __________________________________________________________________________________________ Class: ________________________ Section: _______________________ Roll No: ________________________

Date __________________Signature of the Teacher

JADAVPUR UNIVERSITY


EXPERIMENT NO: 305

STUDY OF MICROSTRUCTURE OF HEAT TREATED STEEL.

OBJECTIVE OF THE EXPERIMENT:To study the microstructure of heat treated carbon steel.

SPECIMEN:

1. Plain carbon steel % C = 0.40 % quenched in water from 850*C 2. Plain carbon steel % C = 0.65% quenched in water from 850*C 3. Plain carbon steel % C = 0.90% quenched in water from 850*C 4. Plain carbon steel % C = 1.10% quenched in water from 850*C

MICROSCOPE: Make _________________________________________

Magnification __________________________________LABORATORY PROCEDURE: Each student will study all the four specimens.

REMARKS: Attach a neat sketches of S-curve and on T.S, B.H.N., % elongation Vs % showing the properties of plain carbon steel.

QUESTION: 1. What are the differences between hardness and hardenablitlity, malleability and toughness. What is spheroid sing? 2. Describe the Jominy End-Quench test. 3. Write short note: a) Mar tempering and Austempering, b) CCT diagram. 4. Mention different heat treatment processes and their impact on mechanical properties.

Name: ___________________________________________________________________________________________ Class: ________________________ Section: _______________________ Roll No: ________________________


JADAVPUR UNIVERSITY


EXPERIMENT NO: 302

PREPARATION OF A SPECIMEN FOR METALLOGRAPHIC EXAMINATION

OBJECTIVE OF THE EXPERIMENT: Collection of sample and preparation of the same for metallographic examination.

SPECIMEN : A suitable specimen which the class teacher may assign.

MICROSCOPE: Make _________________________________________ Magnification __________________________________

LABORATORY: 1. Collection of the sample 2. Mounting of sample 3. Grinding 4. Polishing 5. Etching

REMARKS:

Attach neat sketches of a metallurgical microscope, stages of polishing and etching.

QUESTION:1. What are the differences between microscopic and macroscopic examinations? How is magnification changed? 2. Why are enchants used? Name the principal enchants (not more than five) used for ferrous and non-ferrous sample. 3. Microstructures become clearly visible after etching ---Explain 4. Differentiate between metallurgical microscope and biological microscope.

Name: ___________________________________Class: ________________ Section: _________Roll No: __________


JADAVPUR UNIVERSITY

FACULTY OF ENGINEERING & TECHNOLGYMECHANICAL ENGINEERING DEPARTMENT

Materials & Metallography Laboratory

MOUNTING OF AWKWARD THIN SPECIMEN FOR METALLOGRAPHIC STUDY

Object of Experiment: Experiment No: 301

To know the Mounting procedure of awkwardly thin specimen for Metalloraphic study.

Specimen:Thin and awkward Metallic Specimen

Microscope: Make. Magnification .

Laboratory Procedure:

1. Place the specimen on the block.2. Cylinder is now placed over the block so that it covers the block entirely.3. Pour Bakelite powder inside the block proportionately .4. Place the entire assembly on the mounting machine .5. Put the plunger on the cylinder. 6. Heater coils should be placed around the cylinder. 7. Apply pressure upto 3000-3500 p.s.i. when this pressure is shown on the dial, put on the heater switch.8. When the Bakelite powder begins to set , the pressure drops down and again maintains the pressure around3000-3500 p.s.i.9. When the setting of powder becomes complete, there will be automatic rise of pressure.10. Put off the switch at this point.11. Then by ejection the sample is taken out.

Questions: Remarks:

1. What are the materials used for mounting irregular and awkwardly thin specimen?2. What is the temperature to which it is heated?3. Why thermosetting plastics are used in mounting of the specimens?4. Sketch the mounding press.

Name.ClassSectionRoll

Date Signature of the teacher

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Metallography