Effects of Al

Ti

W

Mo

Cr content at maximum value

minimum value and middle value on microstructure and properties of superalloy K487 were investigated.The results show that there exists less carbide andγ′phase precipitated when the composition content is at low limit

and the carbide andγ′phase are increased when the composition content is at middle value

in addition

carbide andγ′phase are further increased and acicularμphase is precipitated when the composition content reaches high line.And the tensile strength and yield strength of the K487 alloy at room-temperature and 750 ℃-temperature are increased obviously

while the elongation at room-temperature and 750 ℃is decreased with increasing in composition content

especially the composition content at top-line.K487 alloy exhibits desirable comprehensive properties with the composition content at middle value