Re-recognition of the Effects of Phosphorus and Boron on the γ’’ and γ’ Phases in IN718 Alloy

被引：0

作者：

An-Wen Zhang ^{[1
,2
]}

Yang Li ^{[1
]}

Sha Zhang ^{[1
]}

Fang Liu ^{[1
]}

Wei-Hong Zhang ^{[1
]}

Lian-Xu Yu ^{[1
]}

Wen-Ru Sun ^{[1
]}

机构：

[1] Institute of Metal Research, Chinese Academy of Sciences

[2] College of Material Science and Engineering, University of Science and Technology of China

来源：

Acta Metallurgica Sinica(English Letters) | 2019年 / 32卷 / 03期

关键词：

IN718; superalloy; Phosphorus and boron; γ’’ and γ’phases; Hardness;

D O I：

暂无

中图分类号：

TG132.3 [特种热性质合金];

学科分类号：

080502 ;

摘要：

The effects of P and B on the matrix strength and precipitations of γ’ and γ’’ phases in the grain interior were re-recognized in this study. The combination addition of P and B markedly accelerated the precipitations of γ’ and γ’’ phases and strengthened the matrix of IN718 alloy when air-cooled from high temperature, while made no difference when waterquenched from high temperature. The effect of single addition of P on the precipitations of γ’’ and γ’ phases was the same with that of the combination addition of P and B, while the single addition of B had no effect on the precipitations of the two phases. Therefore, it was P rather than B which accelerated the precipitations of γ’ and γ’’ phases. P could take part in the precipitations of γ’ and γ’’ phases, which was revealed by electrochemical extraction and quantitative analysis of chemical composition. It also revealed that P atoms were dissolved in the c matrix to a relatively high degree at the temperature that γ’ and γ’’ phases began to precipitate, and consequently the precipitations of γ’ and γ’’ phases were accelerated. The first-principle calculation indicated that P decreased the formation enthalpies of γ’ and γ’’ phases when it occupied the Ni lattice sites in the two phases, which explained the effect of P on the γ’ and γ’’ phases.

引用

页码：372 / 380

页数：9