Anisotropy of Dynamic Compressive Properties of Non-Heat-Treating Cold-Heading-Quality Steel Bars

Kim, Hyunmin; Kang, Minju; Bae, Chul Min; Kim, Hyoung Seop; Lee, Sunghak

doi:10.1007/s11661-013-2102-3

Cited by 4 publications

(1 citation statement)

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“…이들 강은 1970년대 초 독 일에서 처음 개발된 후 제 2차 오일쇼크를 거치면서 원 가 절감 및 생산성을 인정 받기 시작하여 관련 연구가 꾸준히 진행하고 있다. [1][2][3][4] ------------------------------------------…”

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Effect of Microstructural Factors on Room- and Low-Temperature Impact Toughness of Hypoeutectoid Steels with Ferrite-Pearlite Structure

이승용¹,

정상우²,

황병철³

et al. 2015

Korean. J. Mater. Res.

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This paper presents a study on the room-and low-temperature impact toughness of hypoeutectoid steels with ferritepearlite structures. Six kinds of hypoeutectoid steel specimens were fabricated by varying the carbon content and austenitizing temperature to investigate the effect of microstructural factors such as pearlite volume fraction, interlamellar spacing, and cementite thickness on the impact toughness. The pearlite volume fraction usually increased with increasing carbon content and austenitizing temperature, while the pearlite interlamellar spacing and cementite thickness mostly decreased with increasing carbon content and austenitizing temperature. The 30C steel with medium pearlite volume fraction and higher manganese content, on the other hand, even though it had a higher volume fraction of pearlite than did the 20C steel, showed a better low-temperature toughness due to its having the lowest ductile-brittle transition temperature. This is because various microstructural factors in addition to the pearlite volume fraction largely affect the ductile-brittle transition temperature and lowtemperature toughness of hypoeutectoid steels with ferrite-pearlite structure. In order to improve the room-and low-temperature impact toughness of hypoeutectoid steels with different ferrite-pearlite structures, therefore, more systematic studies are required to understand the effects of various microstructural factors on impact toughness, with a viewpoint of ductile-brittle transition temperature.

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