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Korean Journal of Metals and Materials > Volume 54(9); 2016 > Article
Korean Journal of Metals and Materials 2016;54(9): 637-644. doi: https://doi.org/10.3365/KJMM.2016.54.9.637
다중회귀분석을 이용한 페라이트-펄라이트 조직 아공석강의 충격인성에 미치는 미세조직적 인자의 민감도 해석
이승용, 이상인, 황병철
서울과학기술대학교 신소재공학과
Sensitivity of Microstructural Factors Influencing the Impact Toughness of Hypoeutectoid Steels with Ferrite-Pearlite Structure using Multiple Regression Analysis
Seung-Yong Lee, Sang-In Lee, Byoungchul Hwang
Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 02792, Republic of Korea
Correspondence  Byoungchul Hwang ,Tel: +82-2-970-6638, Email: bhwang@seoultech.ac.kr
Received: 2 March 2016;  Accepted: 8 April 2016.  Published online: 5 September 2016.
ABSTRACT
In this study, the effect of microstructural factors on the impact toughness of hypoeutectoid steels with ferrite-pearlite structure was quantitatively investigated using multiple regression analysis. Microstructural analysis results showed that the pearlite fraction increased with increasing austenitizing temperature and decreasing transformation temperature which substantially decreased the pearlite interlamellar spacing and cementite thickness depending on carbon content. The impact toughness of hypoeutectoid steels usually increased as interlamellar spacing or cementite thickness decreased, although the impact toughness was largely associated with pearlite fraction. Based on these results, multiple regression analysis was performed to understand the individual effect of pearlite fraction, interlamellar spacing, and cementite thickness on the impact toughness. The regression analysis results revealed that pearlite fraction significantly affected impact toughness at room temperature, while cementite thickness did at low temperature.
Keywords: impact toughness, microstructural factor, multiple regression analysis, ferrite-pearlite structure, hypoeutectoid steel
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