Effect of cooling rate on phosphorus segregation behavior and the corresponding precipitation of γ" and γ'phases in IN718 alloy

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2019,（7）
• 页码范围: 1485-1490
• 页数: 6页
• 语种: 英文

摘要

Effect of segregation behaviors of P at different cooling rates on the precipitation of γ" and γ'phases and the corresponding strength are investigated.The precipitation of γ" and γ'phases during cooling is sensi tive to P concentration.With increasing the concentration of P,the amount of γ" and γ'particles increases after air cooling.With decreasing the cooling rate,the accelerating effect of P on the precipitation of γ" and γ'phases decreased first and then increased,which demonstrates the concentration of P dissolved in the grain interior decreases first and then increases.The different effects of P on γ" and γ'phases with different cooling rates were analyzed by the kinetic characteristic of nonequilibrium grain-boundary segregation.The characteristic of nonequilibrium grain-boundary segregation of P in superalloy is further confirmed,and the phenomenon caused by critical cooling rate is captured.