EFFECT OF SULFUR REMOVAL ON SCALE ADHESION TO PWA-1480

被引：56

作者：

SMIALEK, JL ^{[1
]}

TUBBS, BK ^{[1
]}

机构：

[1] CASE WESTERN RESERVE UNIV,CLEVELAND,OH

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1995年 / 26卷 / 02期

关键词：

D O I：

10.1007/BF02664679

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A commercial superalloy, PWA 1480, was annealed in hydrogen at 1000 degrees C to 1300 degrees C in order to remove a 10 ppmw sulfur impurity. This treatment was very successful above 1200 degrees C, resulting in residual sulfur contents below 0.1 ppmw. The degree of scale adhesion in subsequent 1100 degrees C cyclic oxidation tests was inversely related to residual sulfur content. Control of adhesion by desulfurization in the absence of reactive elements supports an adhesion mechanism based on oxide-metal bonding weakened by sulfur segregation. Attempts at sulfur purging and improving adhesion by repeated oxidation/polishing were not successful, in contrast to previous studies on NiCrAl.

引用

页码：427 / 435

页数：9