Austempered Ductile Iron is a family of heat
treated cast irons available in ASTM 897M and EN1564 standard grades.
The austempering heat treatment converts ductile iron to austempered
ductile iron (ADI) bringing about excellent
strength, toughness, and fatigue characteristics. ADI
is stronger per unit weight than aluminums, as wear resistant as
steel and has the potential for up to 50% cost savings.
For the designer ADI is a most versatile material,
enabling innovative solutions to new and current problems. By
selecting precise heat treatment parameters a specific set of
properties can be achieved. The lower hardness ductile iron castings
are used in structural applications, often where weight and cost
reduction are important. Wear resistance is superior to steel at any
given hardness level, making the higher hardness grades ideal for
mining, construction, agricultural and similar high abrasion
applications.
ADI competes favorably with steel forgings,
especially for heavy-duty parts where reliability is paramount. It
is used to upgrade from standard ductile irons, and as a substitute
for manganese steel and nickel-hard materials. When strength is
required ADI is particularly cost-effective:
tensile and yield values are twice those of standard ductile iron;
fatigue strength is 50% higher and it can be enhanced by shot
peening or fillet rolling.
This is the shaft at the bottom of the engine, which converts the
piston’s reciprocating motion into useful rotational motion. A
flywheel is generally attached to the crankshaft; also torsional
coupling, clutch, transmission...(the pistons force it to rotate in
circular motion) and has a connection to the flywheel, clutch, and
eventually the main shaft of the transmission], torque converter and
possibly Belt Pulley or PTO. Other components that the crankshaft
will drive are the water pump, generator, oil pump, camshaft -
through timing gears (and thus valves), and hydraulic pump (some
older models instead had hydraulic pumps connected to PTO or Belt
Puley system). Also, on some machines, it either directly or
indirectly drives superchargers, airport intakes (2 stroke diesels),
and air conditioning pumps (late model tractors only).
