Zhuangqi HU
,
Hongwei SONG
,
Shouren GUO
,
Wenru SUN
,
Dezhong LU
材料科学技术（英）
IN718 Ni-Fe-base alloy was prepared to study the effects of phosphorus. The results show that phosphorus improves morphology of grain boundary precipitates. Phosphorus has a remarkable beneficial effect on stress-rupture life and creep resistance. Increasing phosphorus in IN718 to 0.02\% causes an increase of the apparent creep activation energy from 678.6 kJ/mol to 746.1 kJ/mol. It has been proposed that the significant beneficial effect of phosphorus mainly arises from the inhibition of diffusion along grain boundary.
关键词:
IN718 alloy
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W.B. Han
,
K.F. Zhang
,
B. Wang
,
D.Z. Wu
金属学报(英文版)
The superplasticity and diffusion bonding of IN718 superalloy were studied in this article. The strain rate sensitivity index m was obtained at different temperatures and various initial strain rates using the tensile speed mutation method; m reached its maximum value 0.53 at an initial strain rate of 1×10-4s-1 at 1253K. The diffusion bonding parameters, including the bonding temperature T, pressure p, and time t, affected the mechanism of joints. When the bonded specimen with 25μm thick nickel foil interlayer was tensile at room temperature, the shear fracture of the joints with nickel foil interlayer took place at the IN718 part. Microstructure study was carried out with the bonded samples. The microstructure shows an excellent bonding at the interfaces. The optimum parameters for the diffusion bonding are: T = 1273-1323K, p = 20-30MPa, t = 45-60min.
关键词:
superplasticity
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