Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Investigation of Residual Stress Characteristics of Specimen Fabricated by DED and Quenching Processes Using Thermo-mechanical Analysis

열-기계 연계 해석을 이용한 에너지 제어 용착 및 담금질 공정으로 제작된 시편의 잔류응력 특성 분석

  • 황안재 (조선대학교 기계공학과) ;
  • 이광규 (조선대학교 기계공학과) ;
  • 안동규 (조선대학교 기계공학과)
  • Received : 2021.09.29
  • Accepted : 2021.10.24
  • Published : 2021.12.31
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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

Acknowledgement

이 연구는 2020년도 산업통상자원부 및 한국산업기술평가관리원(KEIT)가 연구비를 지원한 "다종 소재 DED 금속 3D 프린팅 기술기반 중대형 국방 부품의 재생 및 기능 강화 제조기술 개발 (과제번호 : 20009839)" 과제 및 과학기술정보통신부의 재원으로 한국연구재단의 지원을 받아 수행된 중견연구과제인 "고효율 성형 금형 제조를 위한 고경도 재료 및 초합금 대체적 적층 기술 개발 (No. NRF-2019R1A2C1006741)" 과제의 연구 결과중 일부이며, 이에 관계자 여러분께 감사드립니다.

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