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A Study on the Characteristics of Residual Stress in the Manufacturing Process of AISI 1536V and AISI A387

제조공정에 따른 강종별 잔류응력 특성에 관한 연구; AISI 1536V, AISI A387

  • Hwang, Sung-Kug (Department of Convergence Technology Engineering, Chon-buk National University) ;
  • Moon, Jeong-Su (Department of Convergence Technology Engineering, Chon-buk National University) ;
  • Kim, Han Joo (Department of Convergence Technology Engineering, Chon-buk National University)
  • 황성국 (전북대학교 융합기술공학과) ;
  • 문정수 (전북대학교 융합기술공학과) ;
  • 김한주 (전북대학교 융합기술공학과)
  • Received : 2020.05.06
  • Accepted : 2020.06.14
  • Published : 2020.09.30

Abstract

This study analyzes the residual stress of AISI 1536V for an engine shaft of the shipbuilding industry and AISI A387 for a reactor shell of the chemical refining industry by the hole drilling method with a strain gauge rosette, which transforms fine mechanical changes into electrical signals. Tensile residual stress is generated in the forging and heat treatment process because specimens are affected by thermal stress and metal transformation stress. In the heat treatment process, the residual stress of AISI A387 is almost 170% the yield strength at 402 MPa. Since during the machining process, variable physical loads are applied to the material, compressive residual stress is generated. Under the same condition, the mechanical properties greatly affect the residual stress during the machining process. After the stress-relieving heat treatment process, the residual stress of AISI A387 is reduced below the yield strength at 182 MPa. Therefore, it is necessary to control the temperature, avoid rapid heat change, and select machining conditions depending on the mechanical properties of materials during manufacturing processes. In addition, to sufficiently reduce the residual stress, it is necessary to study the optimum condition of the stress-relieving heat treatment process for each material.

Keywords

References

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