Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore
doi:10.3850/978-981-18-6021-8_OR-01-0230
Experimental Study on Deformation Behavior of Cantilever Structure with G6 Deposited Region by a DED Process Through in-situ Measurement
Department of Mechanical Engineering, Chosun University, 309, Pilmun-daero, Dong-gu, Gwangju, South Korea
ABSTRACT
The rapid heating and the rapid cooling (RHRC) phenomenon occurs in the vicinity of the deposited region when the directed energy deposition (DED) process is used to create the deposited bead on the substrate and the previous layer. The residual stress induced by the RHRC phenomenon during deposition causes excessive deformation and significant warpage of the fabricated part for the case of cantilever structure with a slender beam shape. Hence, in order to indirectly estimate the residual stress distribution in the deposited region, the interest in the in-situ measurement of the deformation in the vicinity of the deposited region is greatly increased. The goal of this research work is to experimentally investigate the deformation behavior of the cantilever structure with gridur6 (G6) deposited region by a DED process through in-situ measurement. The substrate with the cantilever structure is fabricated from machining of a Cr-Mo low alloy steel plate. The deposited region with multiple layers is created on the mid region of the substrate through the deposition of G6 powder using a DED process. The experimental set-up with the fixing end of the substrate and the holder of the measurement sensor is designed. IL-030 sensors are attached to bottom region of the experimental set-up to obtain the displacement history of the specimen in a real time. In order to obtain in-situ temperature histories at indicated locations, thermocouples are attached to the specimen. Comparing the displacement history with the temperature history, the influence of the temperature history on the deformation characteristics is investigated. The effects of the deposition strategy and the part thickness on the deformation behavior of the fabricated part are examined. From the results of the examination, proper deposition strategies to reduce the deformation of the cantilever structure are proposed. In addition, the influence of the thickness of the deposited region on deformation and thermal characteristics is discussed.
Keywords: Deformation Behavior, Cantilever Structure, DED Process, G6 Deposited Region, in-situ Measurement.
Department of Mechanical Engineering, Chosun University, 309, Pilmun-daero, Dong-gu, Gwangju, South Korea
ABSTRACT
The rapid heating and the rapid cooling (RHRC) phenomenon occurs in the vicinity of the deposited region when the directed energy deposition (DED) process is used to create the deposited bead on the substrate and the previous layer. The residual stress induced by the RHRC phenomenon during deposition causes excessive deformation and significant warpage of the fabricated part for the case of cantilever structure with a slender beam shape. Hence, in order to indirectly estimate the residual stress distribution in the deposited region, the interest in the in-situ measurement of the deformation in the vicinity of the deposited region is greatly increased. The goal of this research work is to experimentally investigate the deformation behavior of the cantilever structure with gridur6 (G6) deposited region by a DED process through in-situ measurement. The substrate with the cantilever structure is fabricated from machining of a Cr-Mo low alloy steel plate. The deposited region with multiple layers is created on the mid region of the substrate through the deposition of G6 powder using a DED process. The experimental set-up with the fixing end of the substrate and the holder of the measurement sensor is designed. IL-030 sensors are attached to bottom region of the experimental set-up to obtain the displacement history of the specimen in a real time. In order to obtain in-situ temperature histories at indicated locations, thermocouples are attached to the specimen. Comparing the displacement history with the temperature history, the influence of the temperature history on the deformation characteristics is investigated. The effects of the deposition strategy and the part thickness on the deformation behavior of the fabricated part are examined. From the results of the examination, proper deposition strategies to reduce the deformation of the cantilever structure are proposed. In addition, the influence of the thickness of the deposited region on deformation and thermal characteristics is discussed.
Keywords: Deformation Behavior, Cantilever Structure, DED Process, G6 Deposited Region, in-situ Measurement.
