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Carpenter AerMet 340 offers high hardness (HRC 56), 345 ksi (2379 MPa) ultimate tensile strength (UTS), exceptional fracture toughness of 34 ksi√in (37MPa√M), and yield strength (YS) of 300 ksi (2068 MPa). The new alloy has demonstrated superior ductility to alloys of similar strength in terms of an elongation of 11% and reduction in area (RA) of 53%. It has also demonstrated fatigue strength of 140 ksi (965 MPa) at runout in rotating bending fatigue stress tests. Typical mechanical properties are shown in Table 1.
Carpenter AerMet® 340 alloy exhibits strength and toughness comparable to that of Marage 350 but with substantially improved ductility and fatigue resistance.
The new Carpenter grade can be considered for a variety of automotive, racing, aerospace and defense. Applications have included tubing, structural parts and components, drive shafts, springs, connecting rods and crank shafts.
The new Carpenter alloy is a precipitation hardenable (PH) martensitic grade that is heat treated and typically aged at about 900°F (482°C) to develop the desired properties. It is available from Carpenter in bar, hollow bar, sheet, wire, billet, plate and strip.
|Table 1: Typical Room Temperature Mechanical Properties – AerMet® 340 Alloy|
Aged 900°F (482°C)
Heat Treatment = 1775 °F (1 h) Air Cool + -100°F (1 h) Air Warm + 900°F
(2.5 h) Air Cool +
-100°F (1 h) Air Warm + 900°F (2.5 h) Air Cool + -100°F (1 h) Air Warm.
Carpenter Technology Corp.
Carol Aulenbach (610) 208-2355