열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제33권4호
  • /
  • Pages.161-172
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  • 2020
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  • 1225-1070(pISSN)
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  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
권호 표지
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열처리한 A5082와 A6060합금의 인장특성에 미치는 변형율속도 및 예비변형율의 영향

Effect of Strain Rate and Pre-strain on Tensile Properties of Heat-treated A5082 and A6060 Aluminium Wrought Alloys

  • 이충도 (인하공업전문대학 금속재료과)
  • Lee, Choongdo (Dept. of Metallurgical & Materials Engineering, Inha Technical College)
  • 투고 : 2020.05.27
  • 심사 : 2020.06.16
  • 발행 : 2020.07.30
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초록

The tensile property of A5082 and A6060 aluminium wrought alloys was investigated, in terms of the strain rate sensitivity on alloy conditions by heat treatment and bake hardenability on pre-strain prior to strain ageing. The tensile test was carried out in a range of strain rate of 4.17 × 10-5 s-1 ~ 4.17 × 10-5 s-1 in room temperature and the nominal range of pre-strain was 3.0 ~ 10.5%. The tensile deformation of A5082 alloys is characterized as typical case of dynamic strain ageing with negative strain rate sensitivity for all conditions, and the tensile strength indicates a similar level regardless of alloy conditions, except only in full annealed condition. The stress-relief annealing on A6060 alloys can induce practical decrease in strength level of over approximately 100 MPa without any ductility loss, compared to as-rolled condition, while a full annealed and aged condition leads remarkable strengthening effect with the decrease of tensile elongation. Additionally, the bake hardenability of A5082 alloy by strain ageing indicates a negative dependence upon the increase of pre-strain, while A6060 alloy exhibits a positive sign even in low level relatively compared with conventional SPCC.

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