Proceedings of the Korea Committee for Ocean Resources and Engineering Conference (한국해양공학회:학술대회논문집)

Korean Society of Ocean Engineers (한국해양공학회)
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On Evaluation of Material Properties in Spring Steels by Measurement of Ultrasonic Techniques

초음파법에 의한 스프링강의 재질평가에 관하여

  • Kim, Sang-Su (Department of mechanic Engineering Pukyong National University) ;
  • Ha, Kyung-Jun (Department of mechanic Engineering Pukyong National University) ;
  • Kim, Seon-Jin (Department of mechanic Engineering Pukyong National University)
  • 김상수 (부경대학교 기계공학과 대학원) ;
  • 하경준 (부경대학교 기계공학과 대학원) ;
  • 김선진 (부경대학교 공과대학 기계공학부)
  • Published : 2002.05.17
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Abstract

The general purpose of this paper is Evaluation of material properties in spring steels by investigate correlation between ultrasonic attenuation and virker's hardness, charpy impact properties, microstructures. The three test speciments of the $490{\times}90 mm$ plates and 20 mm thick are used but differ in heat treatment, one is rolled plate, the second is quenched and then tempered, and the third is quenched. ultrasonic attenuation were obtained at fifteen locations on the plates. In order to investigate the correlation between hardness ( especially, HV ) and the attenuation, the virker's hardness and the microstructures were observed for three spring steels. also the charpy impact test were carried out at the room temperature in order to investigate the relationship between impact properties and the attenuation. The experimental results obtained from three different spring related to the heat treatment conditions and attenuation coefficient is increased with increasing the hardness(HV). Ultrasonic attenuation coefficients have shawn are ability to distinguish among spring steels.

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