Abstract
The effects of post heat treatments on the oxidation behavior of laser powder bed fusion (LPBF) printed-316 L stainless steel (SS) in 600 °C supercritical CO2 were studied. The oxidation resistance was gradually deteriorated with increasing treatment temperature. That is because: 1, the high dislocation density in LPBF-316 L SS, which promotes the formation of protective oxide film by facilitating the diffusion of active elements, was decreased after heat treatment. 2, the density of twin boundary which is subject to general oxidation was increased, while that of low angle grain boundary which can passivate was decreased remarkably after hot isostatic pressing, thus decreasing the fraction of passivated grain boundaries.
| Original language | English |
|---|---|
| Article number | 116886 |
| Journal | Scripta Materialia |
| Volume | 268 |
| DOIs | |
| Publication status | Published - 1 Nov 2025 |
| MoE publication type | A1 Journal article-refereed |
Funding
X. Ma, Z. Tao and W. Kuang gratefully acknowledge the financial support of the National Natural Science Foundation of China (No. 52271068). Z. Que acknowledges the financial support from VTT GG Core 2024. The authors thank Mr. Jiawei Wang, Mr. Yifan Pan, Dr. Chaowei Guo, Mr. Wei Wang and Mrs Qinqin Fu of Xi'an Jiaotong University for their help on SEM and EPMA characterization.
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 9 Industry, Innovation, and Infrastructure
Keywords
- Dislocation cell
- Grain boundary
- Laser powder bed fusion
- Oxidation
- S-CO2
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