Effect of Aluminum on Microstructure and High-Temperature Oxidation Resistance of Austenitic Heat-Resistant Steel

被引：10

作者：

Gu, Chang ^{[1
]}

Liu, Ruizhuo ^{[1
]}

Wang, Chengduo ^{[1
]}

Sun, Yufu ^{[1
]}

Zhang, Shaojun ^{[1
]}

机构：

[1] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Henan, Peoples R China

来源：

METALS | 2020年 / 10卷 / 02期

基金：

国家重点研发计划;

关键词：

heat-resistant steels; aluminum; oxidation resistance; microstructure; STAINLESS-STEELS; WATER-VAPOR; HK40; ADDITIONS; ALLOYS; SCALE; PHASE;

D O I：

10.3390/met10020176

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The ZG40Cr20Ni20Alx (x = 0, 1.76, 3.45, and 5.34) heat-resistant steel has been newly developed on the basis of HK40 steel for aggressive oxidizing environments. The results reveal that the Al greatly enhances the oxidation resistance of ZG40Cr20Ni20 steel at high temperatures. The mass gain of ZG40Cr20Ni20 upon oxidation at 1100 degrees C for 480 h is up to 103.6 mg/cm(2), while the values for the steels containing 1.76 and 3.45 wt% Al are sharply decreased to 6.1 and 5.4 mg/cm(2), respectively. Both of their matrix phases are still austenite, which is the same as that of ZG40Cr20Ni20. Their FeCr2O4 spinel oxide scales appear to be more stable under high oxygen partial pressure than that of ZG40Cr20Ni20, and the continuous Cr2O3 film appears between their matrix and spinel oxide. As for the steel with 5.34 wt% Al, the mass gain is only 1.1 mg/cm(2). Its matrix is compared to those of austenite and ferrite, and the oxide scale is continuous Al2O3.

引用

页数：8

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