Degradation of high-temperature oxidation resistance for Ni-based alloys by re addition and the optimization of Re/Al content

被引：34

作者：

Moniruzzáman, M ^{[1
]}

Maeda, M ^{[1
]}

Murata, Y ^{[1
]}

Morinaga, M ^{[1
]}

机构：

[1] Nagoya Univ, Grad Sch Engn, Dept Mat Sci & Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan

来源：

ISIJ INTERNATIONAL | 2003年 / 43卷 / 03期

关键词：

Ni-based superalloy; high-temperature oxidation resistance; Re effect;

D O I：

10.2355/isijinternational.43.386

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

High-temperature oxidation tests were conducted with two groups of Ni-based superalloys in order to elucidate the Re effect on oxidation resistance. One group of alloys was the Ni-8Cr-2Ti-10Al-Re system, characterized by 10mol% Al content. The other group of alloys was the Ni-8Cr-2Ti-15Al-Re system, characterized by 15 mol% Al content. The alloy compositions were chosen with the aid of the d-electrons concept, so that any undesirable phases would not appear in the microstructure. Both cyclic and isothermal oxidation tests were carried out at 1373 K for a total time of 720 ks. The oxidation resistance decreased clearly with increasing Re content in the 10-Al series alloys, but did not in the 15-Al series alloys. The alloys having a Re/Al ratio (mol%) up to 0.1 exhibited very small mass change by oxidation, so the Re/Al ratio was indeed a good indication for the design of superalloys having a good oxidation resistance.

引用

页码：386 / 393

页数：8

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