Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 760, Issue -, Pages 105-117Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.05.115
Keywords
Maraging steel; Selective laser melting; Heat treatment; Microstructure; Mechanical properties
Categories
Funding
- Natural Science Foundation of China (NSFC) [51875215]
- Guangdong Province Science and Technology Project [2015B090921002, 2016B09092500]
- Guangzhou Science and Technology Project [201704020118]
- Singapore Ministry of Education AcRF Tier 2 [MOE2018-T2-1-140]
- A*STAR AME IAF-PP [A1893a0031]
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This work investigates the solution phenomenon, aging behavior and room-temperature mechanical properties of maraging steel manufactured by selective laser melting (SLM). Different heat treatment experiments, including solution treatment (ST), direct aging treatment (DAT) and solution + aging treatment (SAT) are designed. Microstructure analysis indicates that ST and SAT will eliminate the cellular and lath structures, but DAT has little effect on these. The content of austenite increases with the addition of DAT temperature and holding time. While austenite is almost undetectable in ST and SAT samples. Meanwhile, both the elongation and toughness of the samples with DAT gain a slight improvement with the temperature increasing. Importantly, DAT yields similar microhardness, tensile strength and impact toughness to SAT, although the resultant microstructures are completely different. The results demonstrate that DAT can achieve the similar mechanical properties to SAT samples. Samples with high mechanical properties (microhardness of 653.93 HV and ultimate strength of 2126.30 MPa) have been obtained by DAT at 520 degrees C for 6 has well as solution treatment at 900 degrees C for 1 h and aging treatment at 520 degrees C for 6 h. This investigation reveals the evolution regularity of microstructure, microhardness, tensile performance and impact toughness of maraging steel manufactured by SLM after different heat treatments.
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