期刊
METALS
卷 8, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/met8080589
关键词
selective laser melting; H13 tool steel; nanoindentation; strain-rate sensitivity
资金
- Fundamental Research Program of the Korean Institute of Materials Science (KIMS)
- National Research Council of Science & Technology (NST) grant by the Korea government (MSIP) [CRC-15-03-KIMM]
- National Research Council of Science & Technology (NST), Republic of Korea [CRC-15-03-KIMM] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This paper demonstrates the successful printing of H13 tool steel by a selective laser melting (SLM) method at a scan laser speed of 200 mm/s for the best microstructure and mechanical behavior. Specifically, the nanoindentation strain-rate sensitivity values were 0.022, 0.019, 0.027, 0.028, and 0.035 for SLM H13 at laser scan speeds of 100, 200, 400, 800, and 1600 mm/s, respectively. This showed that the hardness increases as the strain rate increases and, practically, the hardness values of the SLM H13 at the 200 mm/s laser scan speed are the highest and least sensitive to the strain rate as compared to H13 samples at other scan speeds. The SLM processing of this material at 200 mm/s laser scan speed therefore shows the highest potential for advanced tool design. Residual stress is expected to affect the hardness and shall be investigated in future research.
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