期刊
MATERIALS LETTERS
卷 227, 期 -, 页码 128-131出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.05.042
关键词
Selective laser melting (SLM); Phase transformation; Microstructure; Grain boundaries; Microhardness
资金
- National Natural Science Foundation of China [51575267, 51735005]
- National Key Research and Development Program ''Additive Manufacturing and Laser Manufacturing [2016YFB1100101]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Jiangsu Innovation Program for Graduate Education [KYLX16_0344]
A direct preparation of complete lath martensite microstructure (transformation rate delta > 99%) in tool steel was successfully realized using selective laser melting (SLM) in conjunction with laser remelting (LR) technique. Ultrafine lath martensite with a high percentage of low-angle grain boundaries (LAGBs) (46.12%) was formed. This unique microstructure contributed to the prominent effect of dislocation rearrangement and entanglement within the substructure of martensite, leading to a significant improvement of mechanical properties. An ultrahigh microhardness of similar to 765.1 HV0.3 was obtained, which is much higher than the previously reported values of as-built SLM hardened steel such as H13 and maraging steel. (C) 2018 Elsevier B.V. All rights reserved.
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