This document discusses various technological properties of materials: Machinability is defined as how easily a material can be cut or shaped by tools. It depends on properties like hardness, grain size, lubricants used. White cast iron is not machinable while grey cast iron is easy to machine. Weldability is how easily a material can be joined to itself or other materials through welding. It depends on properties like composition, strength at high temperatures, and thermal properties. Workability/formability is how easily a material can be shaped while solid through processes like forging and extrusion without cracking. Cold workability refers to shaping cold materials while hot workability is shaping hot materials. Castability is how easily

1. Types Of Technological Properties
BY
Dr. K. SENTHILARASAN
ASSISTANT PROFESSOR
DEPARTMENT OF PHYSICS
E.G.S.PILLAY ARTS & SCIENCE COLLEGE
NAGAPATTINAM-611002

2. Types of technological properties
• Machinability.
• Weld ability.
• Workability or formability.
• Cast ability
• Malleability

3. Machinability
Machinability may be defined as the property of a
material indicating the ease with which a given material
can be cut or removed by cutting tool in various
machining operations such as turning, drilling milling etc.
Machinability of a material depends upon:
• mechanical properties like hardness, work hardening,
shearing strength, rigidity of the material etc.,
• Physical properties like grain size, composition, size,
microstructure, coolant etc.,
• Feed and depth of cut.
• Kind and shape of the cutting tool used.
• Coefficient of friction between chip and tool.
• Quality of the lubricant used during the operation.

4. • White cast iron is not machinable while grey cast
iron is machinable in an easy manner.
• The grey cast iron possesses carbon in free form
as graphite flakes. These graphite flakes act to
cause discontinuities in ferrite. This is helping the
chips to break up easily during machining.
• Excellent machinability materials: Zinc alloy,
aluminum alloys, magnesium alloy, gun metals.
• Poor machinability materials: Monel metal,
high speed steel.

5. Weld ability
Weld ability may be defined as the property
of a material indicating the ease with which it
forms a sound joint with similar or dissimilar
material to fabricate a structure by the welding
processes with or without application of pressure
or filler material.
Weld ability of materials is influenced by
its composition, brittleness, strength at elevated
temperature, thermal properties.

6. Workability or formability
Workability or formability of a material may
be defined as the property indicating the ease with
which it can be formed into different shape and
sizes by different metal forming processes like
forging and extrusion while it is in solid state.
Cold workability of a material indicates the
ease of shape or size change in a cold condition
without developing cracks or rupture.
Hot workability of a material indicates the
ease of shape or size change in a hot condition
without developing cracks or rupture.

7. Cast ability
Cast ability of a material is the property
indicating the ease with which it can be formed into
different shapes and size from its liquid state. The
cast ability of material is affected by solidification
rate, gas porosity, segregation and shrinkage.
Metals with low solidification rate possess
good fluidity and also fluidity and also good cast
ability.
Low rate of shrinkage and low segregation
improve the cast ability of the material.

8. Malleability
Malleability of a material is the property by
virtue of which it can be deformed into thin sheets
by rolling or hammering without rupture. It depends
mainly on the crystal structure. Small grain size
materials are used for making thin sheets and large
grain size materials are used for making thick
sheets.
• Excellent malleability: gold, silver, aluminum.
• Poor malleability: zinc, iron, nickel.

9. Thank you