음향방출법에 의한 SM45C 고주파 열처리 강의 기계적 특성 평가
The Analysis of Mechanical Properties of the High Frequency Induction Hardening SM45C Steel by Acoustic Emission
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초록
This study deals with the high frequency induction hardening (HF at 850℃, 120kHz & 50kW condition)SM45C steel. (1) The HF specimen, which was tempered at 150℃, did not show any tempering effect. A brittle fracture occurred at rounded area of the tensile specimen. AE (acoustic emission) amplitude distribution showed between 45dB and 60dB. (2) A slip and fracture occurred at the hole area of the HF specimen which was tempered at 300℃. As they pass the yield point, the AE energy is increased intermittently and AE amplitude distribution exists between 70dB and 85dB. In addition, after imposing the maximum tensile load,AE signals showed high amplitude and energy distribution. The AE amplitude showed between 45dB and 70dB. (3) A brittle fracture occurred at HF specimen which was tempered at 450℃ as if it is torn in the direction of 45° on parallel area over the both sides of the tensile specimen, which lead to several peak appeared in AE energy. It was found that the AE amplitude was relatively low and the AE energy was high.
Abstract
This study deals with the high frequency induction hardening (HF at 850℃, 120kHz & 50kW condition)SM45C steel. (1) The HF specimen, which was tempered at 150℃, did not show any tempering effect. A brittle fracture occurred at rounded area of the tensile specimen. AE (acoustic emission) amplitude distribution showed between 45dB and 60dB. (2) A slip and fracture occurred at the hole area of the HF specimen which was tempered at 300℃. As they pass the yield point, the AE energy is increased intermittently and AE amplitude distribution exists between 70dB and 85dB. In addition, after imposing the maximum tensile load,AE signals showed high amplitude and energy distribution. The AE amplitude showed between 45dB and 70dB. (3) A brittle fracture occurred at HF specimen which was tempered at 450℃ as if it is torn in the direction of 45° on parallel area over the both sides of the tensile specimen, which lead to several peak appeared in AE energy. It was found that the AE amplitude was relatively low and the AE energy was high.
참고문헌 (7)
- 최재열, "금속열처리", pp.502~508 (1987), 문운당
- I. Lanchon-Magnin, "Application of Signal Processing to Acoustic Emission Signals Emitted by Steel Specimens during Tensile Tests", Ultrasonics, 20(1), pp.18~24 (1982)
- Korean Standards Association, "Test pieces for tensile test for metallics materials", KS B 0801, ~ (2002)
- J. J. Shim, "Tempering Behavior of 0.45% Carbon Steel Treated by a High Frequency Induction Hardening Technique", Journal of the Korean Society for Heat Treatment, 3(2), pp.10~19 (1990)
- 우창기, "원공결함을 갖는 SM45C 인장시험편의 강도해석과 음향방출에 관한 사례연구", 한국생산제조시스템학회지, 17(1), pp.50~58 (2008), 한국생산제조시스템학회
- 이장규, "SWS 490A 강의 용접 열영향부 음향방출 특성에 대한 연구(2)", 한국생산제조시스템학회지, 15(5), pp.104~113 (2006), 한국생산제조시스템학회
- 조대희, "음향방출법에 의한 저항 점용접부의 파괴특성에 대한 연구", 한국생산제조시스템학회지, 16(2), pp.14~22 (2007), 한국생산제조시스템학회