Thermal Fatigue Properties of H13 Hot-Work Tool Steels Processed by Selective Laser Melting

Metals

Yan Wu¹  Qingsong Wei²  Yusheng Shi³  Mei Wang³ 

[1] Mould Technology, School of Materials Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;Department of Industrial Engineering, University of Louisville, Louisville, KY 40292, USA;;State Key Laboratory of Materials Processing and Die &

关键词: selective laser melting (slm);    tool steel;    thermal fatigue;    hardness;    microstructure;   

DOI  :  10.3390/met10010116

来源: DOAJ

【 摘 要 】

Currently, selective laser melting (SLM) is gaining widespread popularity as an alternative manufacturing technique for complex and customized parts, especially for hot-work and injection molding applications. In the present study, as the major factors for the failure of H13 hot-work die steels during hot-working, thermal fatigue (TF) properties of H13 processed by SLM and a conventional technique were investigated. TF tests (650 °C/30 °C) were conducted on the as-selective laser melted (As-SLMed), thermally treated selective laser melted (T-SLMed), and forged (Forged) H13. Results show that the As-SLMed H13 exhibited the best TF resistance properties among the specimens herein (the shortest total crack length and highest hardness of 687 ± 12 HV₅), whereas the Forged H13 exhibited the poorest TF resistance properties (the longest total crack length and lowest hardness of 590 ± 11 HV₅) after TF tests. TF resistance properties were closely related to the initial and final hardness. Further microstructural investigations revealed that the typical cell-like substructures, increased amount of retained austenite, and most importantly, refined grain size were the main reasons for the improved TF resistance properties in the As-SLMed H13 compared to the Forged counterparts.

【 授权许可】

Unknown