Selective laser melting and tempering of H13 tool steel for rapid tooling applications

被引：0

作者：

Katancik, Michael ^{[1
,2
]}

Mirzababaei, Saereh ^{[1
,2
]}

Ghayoor, Milad ^{[1
,2
]}

Pasebani, Somayeh ^{[1
,2
]}

机构：

[1] School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University, Corvallis,OR,97330, United States

[2] Advanced Technology and Manufacturing Institute (ATAMI), Corvallis,OR,97330, United States

来源：

Journal of Alloys and Compounds | 2022年 / 849卷

关键词：

H13 components with a relative density of ∼99% were additively manufactured using the selective laser melting (SLM) process. The highest density part (relevant density 99%) with the lowest level of porosity (3 (152 W laser power; 100 mm/s scanning speed; 40 μm hatch spacing; and 50 μm layer thickness). Wrought and additively manufactured samples underwent tempering at 550; 600; and 650 °C for 2 h followed by furnace cooling. Additively manufactured samples and wrought H13 samples that were austenitized followed by water quenching were martensitic with similar microhardness values of 708.4 ± 25.0 HV and 708.1 ± 12.6 HV; respectively. A tempered martensitic structure was observed in SLM-manufactured and tempered samples. Samples that were additively manufactured and tempered at 550 °C showed higher microhardness (728.5 ± 28.2 HV) than non-tempered SLM-manufactured samples due to an upward shift in the secondary hardening phase. Tempering at 600 and 650 °C resulted in coarsening of the carbides and martensite; which led to a reduction in microhardness. Additively manufactured samples maintained higher microhardness values than wrought H13 samples at all tempering temperatures; likely because of higher dislocation density; finer grains present; and higher volume fraction of carbide nanoparticles. © 2020 Elsevier B.V;

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