Materials and Special Processes

Design of machine elements is concerned with the selection of materials and metallurgical processing. Many factors influence the selection of materials for machine element, and the relative importance of each can vary. These factors include:

(1) Mechanical Properties
(2) Grade and Heat Treatment
(3) Cleanliness
(4) Dimensional Stablility
(5) Availability and Cost
(6) Hardenability and Size Effects
(7) Machinability and Other Manufacturing
Characteristics

Heat treatment methods which effect the whole workpiece, elements, workability of machine and life of machine.