Abstract
The post-processing (punching or trimming) of high-strength parts reinforced by hot stamping requires punch molds with improved mechanical properties in hardness, resistance to wear, and toughness. In this study, a semi-additive manufacturing (semi-AM) method of heterogeneous materials was proposed to strengthen these properties using high wear resistance steel (HWS) powder and directed energy deposition (DED) technology. To verify these mechanical properties as a material for the punch mold for cutting, specimens were prepared and tested by a semi-AM method of heterogeneous material. The test results of the HWS additive material by the semi-AM method proposed in this study are as follows: the hardness was 60.59–62.0 HRc, which was like the Bulk D2 specimen. The wear resistance was about 4.2 times compared to that of the D2 specimen; the toughness was about 4.0 times that of the bulk D2 specimen; the compressive strength was about 1.45 times that of the bulk D2 specimen; the true density showed 100% with no porosity. Moreover, the absorption energy was 59.0 J in a multi-semi-AM specimen of heterogeneous materials having an intermediate buffer layer (P21 powder material). The semi-AM method of heterogeneous materials presented in this study could be applied as a method to strengthen the punch mold for cutting. In addition, the multi-semi-AM method of heterogeneous materials will be able to control the mechanical properties of the additive material.
Highlights
Today’s automobile industry demands technology for strengthening parts using thin plates to achieve weight reduction
The mechanical property test for the AM material of high wear resistance steel (HWS) powder was performed to verify that the mechanical properties are enough for a punch mold material
To improve the toughness that appears as a weakness in general high-hardness and high-abrasion tool steels, the additive manufacturing specimen was fabricated by applying a semi-additive manufacturing (semi-AM) method of the heterogeneous material and verified through mechanical property tests
Summary
Today’s automobile industry demands technology for strengthening parts using thin plates to achieve weight reduction. To overcome the limitation on the lamination of high-strength tool steel powder, many studies have been conducted on mold repair and mold strengthening through partial addition of heterogeneous materials using the directed energy deposition (DED) method [11,12,13,14]. In these studies, to obtain the mechanical properties required for a punch mold, a high toughness material with a relatively low strength was applied to the substrate material, and a high strength functional part was partially additive with a high strength powder. Process. 2020, 4, 98 low toughness of the punch mold by using the HWS powder material and the Semi-AM (additive manufacturing) method
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