Improvement of corrosion resistance of SS316L manufactured by selective laser melting through subcritical annealing
- Resource Type
- Authors
- Qiaoying Shi; Chengshuang Zhou; Yangyang Song; Peng Xu; Huimin Tao; Shiyin Hu; Jinyang Zheng; Lin Zhang
- Source
- Corrosion Science. 164:108353
- Subject
- Materials science
Chemical substance
Annealing (metallurgy)
020209 energy
General Chemical Engineering
02 engineering and technology
General Chemistry
021001 nanoscience & nanotechnology
law.invention
Corrosion
Magazine
law
0202 electrical engineering, electronic engineering, information engineering
Pitting corrosion
Substructure
General Materials Science
Selective laser melting
Composite material
0210 nano-technology
Science, technology and society
- Language
- ISSN
- 0010-938X
The effect of heat treatment on pitting-corrosion resistance of 316 L stainless steel manufactured via selective laser melting (SLM) was investigated. The result shows that both pitting-corrosion resistance and mechanical properties under Subcritical-temperature heat treatment (950 °C) are better than 1100 °C and as-received. For as-received samples, the most prone to pitting corrosion is melt-pool boundary (MPB). Subcritical-temperature heat treatment not only eliminates MPBs and high-density dislocation but also retains advantages of inclusion nanocrystallisation, cellular substructure. And recrystallisation occurs during 1100 °C heat treatment significantly reduces low-angle grain-boundary density and increases segregation and re-precipitation, which weakens corrosion resistance and mechanical properties.