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http://dx.doi.org/10.14775/ksmpe.2021.20.12.113

Investigation of Residual Stress Characteristics of Specimen Fabricated by DED and Quenching Processes Using Thermo-mechanical Analysis  

Hwang, An-Jae (School of Mechanical Engineering, Chosun UNIV.)
Lee, Kwang-Kyu (School of Mechanical Engineering, Chosun UNIV.)
Ahn, Dong-Gyu (School of Mechanical Engineering, Chosun UNIV.)
Publication Information
Journal of the Korean Society of Manufacturing Process Engineers / v.20, no.12, 2021 , pp. 113-122 More about this Journal
Abstract
Complicated residual stress distributions occur in the vicinity of a deposited region via directed energy deposition (DED) process owing to the rapid heating and cooling cycle of the deposited region and the substrate. The residual stress can cause defects and premature failure in the vicinity of the deposited region. Several heat treatment technologies have been extensively researched and applied on the part deposited by the DED process to relieve the residual stress. The aim of this study was to investigate the residual stress characteristics of a specimen fabricated by DED and a quenching process using thermomechanical analyses. A coupled thermomechanical analysis technique was adopted to predict the residual stress distribution in the vicinity of the deposited region subsequent to the quenching step. The results of the finite element (FE) analyses for the deposition and the cooling measures show that the residual stress in the vicinity of the deposited region significantly increases after the completion of the elastic recovery. The results of the FE analyses for the heating and quenching stages further indicate that the residual stress in the vicinity of the deposited region remarkably increases at the initial stage of quenching. In addition, it is observed that the residual stress for quenching is lesser than that after the elastic recovery, irrespective of the deposited material.
Keywords
Directed Energy Deposition; Quenching; Thermo-mechanical Analysis; Residual Stress; Depositied Material;
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