Effect of Pack Aluminizing on High-Temperature Oxidation Behavior of 310S Stainless Steel
MATERIALS CHINA[ISSN:1674-3962/CN:61-1473/TG]
- Issue:
- 2026年08
- Page:
- 60-69
- Research Field:
- Publishing date:
Info
- Title:
- Effect of Pack Aluminizing on High-Temperature Oxidation Behavior of 310S Stainless Steel
- Author(s):
- WANG Aomeilin; LI Shuai; XING Lidan; QI Yidong; BAO Zebin
- 1.School of Metallurgy，Northeastern University，Shenyang 110819，China
2.Shi-Changxu Innovation Center for Advanced Materials，Institute of Metal Research，Shenyang 110016，China
3.CSIC Longjiang Guanghan Gas Turbin Co.，Ltd.，Shenyang 110016，China
- Keywords:
- pack cementation aluminizing; 310S stainless steel; aluminide coating; pre-oxidation; high-temperature oxidation
- CLC:
- PACS:
- -
- DOI:
- -
- DocumentCode:
- Abstract:
- 310S stainless steel is widely applied to high-temperature equipment such as heat exchangers due to its excellent high-temperature mechanical properties. Nevertheless, long-term service at elevated temperatures inevitably causes surface oxidation and subsequent failure of the substrate. In this work,aluminide coatings were fabricated on 310S stainless steel via the pack cementation aluminizing process. Low-pressure pre-oxidation treatment was adopted to promote the in-situ formation of a dense α-Al2O3 protective scale on the coating surface. Isothermal oxidation experiments were conducted to comparatively investigate the oxidation kinetic behaviors of bare 310S substrate, as-prepared FeAl coating and pre-oxidized FeAl coating after 300 h oxidation at 800 ℃, 900 ℃ and 1000 ℃. Combined with multiple characterization methods including XRD, SEM and EDS, the oxidation mechanism was further analyzed. The results reveal that the oxides formed on the uncoated substrate, such as Cr2O3 and MnCr2O4, are prone to spallation and structural failure. A protective alumina scale is formed on the coating surface. The as-aluminized coating remarkably reduces the oxidation rate of the substrate, and its parabolic rate constant Kp is decreased by 1–2 orders of magnitude in comparison with the bare substrate. The kinetic curves of aluminide coatings after 300 h oxidation at all three temperatures comply well with the parabolic oxidation law. In contrast, the substrate follows the parabolic law only at 800 ℃. When the temperature rises to 900 ℃ and 1000 ℃, the mass gain curves of the substrate present obvious nonlinear characteristics, which is closely associated with the volatilization and repeated spallation of Cr2O3. The combination of high-temperature protective aluminide coating and reasonable pre-oxidation treatment can greatly improve the high-temperature oxidation resistance of 310S stainless steel.
Last Update: 2026-06-30