Reference:-The Testing & Inspection of Engineering Materials by Harme E. Davis 3rdEdition Publisher : McGraw Hill Book Company. Materials and process by James F. Young 2ndedition Publish by: Charles E Tuttle company Tokyo
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41 LESSONPLANTITLE OF TOPIC [Short, Description]Lesson No: 21 Tempering Name: MUHAMMAD RAZZAQ KHAN SUBJECT:(Course Title) Mech.362Instructor: Mechanical Time: 50 min . GENERAL OBJECTIVES: 01 –Tempering objectives 02- Understand tempering method SPECIFIC OBJECTIVES: The student should be able to Expected Entry behaviors01 –Understand tempering objection To aware defects of hardening 02 –Define tempering 03 –Describe tempering 04- Describe mar tempering Time Allocated Topics ,NOTES ( Brief ) With teacher students activates Key points/ Reminders / Sketch Teaching Aids / Evaluation Tempering . Definition A low temperature heat treatment applied to fully hardened steel (a steel which have been heated into the austenitic region and water quenched to form martensite )Immediately after quenching , hardened steel is very brittle and carries high internal stresses these can reserlt in cracking or slow small Dimensional changes with time .Objectives of tempering . 01-To avoid cracking during service 02-Prepare springs 03-To convert complete martensite into some amount of martensite and bainite 04-Reduce brittleness 05-Increase toughness. 06-To produce proper hardness in cutting tools . 07-Enhance resistance against shocks .
42 Topics ,NOTES ( Brief ) With teacher students activities Key points/ Reminders / Sketch Teaching Aids / Evaluation Types of tempering . 01-Austempering 02-Mar tempering Tempered martensite form in austempering also some amount of bainite form high tensile strength and ductility achieved Austempering . After hardening preheated the steel (below the lower critical temperature) in a furnaceIn heavy oil in a salt bath or in molten lead , it is held long enough for heat to penetrate thoroughly after that it is allowed to cool down in air .No hardest structure can be obtained Mar tempering . Also held in bath but not long so much long to form bainite . It is taken out to cool down in air to maintain the mastensite Testing & follow UP : [to see if leaner acquainted information or skill ] Write down the tempering and its objection Special assignment: [ usually homework ] Explain austempering and martempering Tools materials & aids : White board and marker wall chart . Reference:-The Testing & Inspection of Engineering Materials by Harme E. Davis 3rdEdition Publisher : McGraw Hill Book Company. Materials and process by James F. Young 2ndedition Publish by: Charles E Tuttle company Tokyo
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43 LESSONPLANTITLE OF TOPIC [Short, Description]Lesson No : 22 Annealing Name: MUHAMMAD RAZZAQ KHAN SUBJECT:(Course Title) Mech. 362 Instructor: Mechanical Time: 50 min.
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