J. Mater. Sci. Technol. ›› 2021, Vol. 68: 91-102.DOI: 10.1016/j.jmst.2020.08.013

• Research Article • Previous Articles     Next Articles

High-temperature oxidation behavior of modified 4Al alumina-forming austenitic steel: Effect of cold rolling

Qiuzhi Gaoa,b,*(), Ziyun Liua,b, Huijun Lic, Hailian Zhangd,**(), Chenchen Jianga,b, Aimin Haoa,b, Fu Qua,b, Xiaoping Lina,b   

  1. a School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China
    b School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
    c School of Materials Science & Engineering, Tianjin University, Tianjin 300354, China
    d Daotian High Technology Co., Ltd., Qinhuangdao 066004, China
  • Received:2020-04-26 Revised:2020-06-16 Accepted:2020-06-27 Published:2021-03-30 Online:2021-05-01
  • Contact: Qiuzhi Gao,Hailian Zhang
  • About author:**hailianchina@126.com(H. Zhang).
    *School of Resources and Materials, Northeastern Uni-versity at Qinhuangdao, Qinhuangdao 066004, China. E-mail addresses: neuqgao@163.com (Q. Gao),

Abstract:

The oxidation behavior and mechanism of as-received and 30 % cold-rolled alumina-forming austenitic (AFA) steel were investigated in dry air at 700 °C. The results show that the mass gain per unit area curves of as-received and 30 % cold-rolled steels subject to near-parabolic law before 100 h oxidation time. Two samples both show higher high-temperature oxidation resistance due to the formation of dense Al2O3 oxide scale. Gradual spallation of outer scale results in the formation of continuous and dense alumina scale. Dislocations can act as short-circuit diffusion channel for the diffusion of Al from alloy matrix to surface, and also provide nucleation sites for B2-NiAl phase, which ensure the continuous formation of Al2O3 scale.

Key words: Alumina-forming austenitic steel, High-temperature oxidation, Cold rolling, Oxidation mechanism