Influence of Phosphorus Addition on the Stress Rupture Properties of Direct Aged IN706 Superalloy

Crystals

Sha Zhang¹  Wenru Sun²  Weiwei Zhang²  Xin Xin²  Chaochao Xue²  Dan Jia²  Anwen Zhang²  Weiyang Wang³ 

[1] College of Mechanical & Electrical Engineering, Changsha University, Changsha 410022, China;Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;Jiangxi Province Key Laboratory of Polymer Preparation & Processing, Shangrao Normal University, Shangrao 334001, China;

关键词: phosphorus;    direct aging heat treatment;    stress rupture property;    grain boundary segregation;    IN706 alloy;   

DOI  :  10.3390/cryst10080641

来源: DOAJ

【 摘 要 】

This study investigated the influence of phosphorus (P) addition on the stress rupture properties of direct aged IN706 superalloy. The results showed that P slightly improved the stress rupture life of the superalloy when added in the range between 0.002% and 0.008%; however, it significantly reduced the stress rupture life when added in the range between 0.013% and 0.017%. Microstructure characterization indicated that the precipitation of γ′, γ″, and η phases was not significantly affected by the addition of P. Phosphides precipitated in the alloy containing 0.017% P after aging at 980 °C for 10 min. Compared to a similar study previously made on IN706 superalloy, it was found that the optimum P concentration in the as-solutioned state for improving the stress rupture properties was not definite. Furthermore, the relationship between the amount of P segregated at the grain boundary and the role of P on the stress rupture properties was discussed.

【 授权许可】

Unknown