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2017 Vol.27, Issue 4 Preview Page
Effect of Micro-Alloying Elements and Transformation Temperature on the Correlation of Microstructure and Tensile Properties of Low-Carbon Steels with Ferrite-Pearlite Microstructure

페라이트-펄라이트 조직 저탄소강의 미세조직과 인장 특성의 상관관계에 미치는 미량합금원소와 변태 온도의 영향

Sang-In Lee
,
Ji-Min Lee
,
Byoungchul Hwang†
이 상인
,
이 지민
,
황 병철†
Department of Materials Science and Engineering Seoul National University of Science and Technology, Seoul 01811, Korea
서울과학기술대학교 신소재공학과
†Corresponding author E-Mail : bhwang@seoultech.ac.kr (B. Hwang, Seoul Nat'l Univ. Sci. and Technol.)
April 2017. pp. 184-191
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Abstract

This present study deals with the effect of micro-alloying elements and transformation temperature on the correlation of microstructure and tensile properties of low-carbon steels with ferrite-pearlite microstructure. Six kinds of lowcarbon steel specimens were fabricated by adding micro-alloying elements of Nb, Ti and V, and by varying isothermal transformation temperature. Ferrite grain size of the specimens containing mirco-alloying elements was smaller than that of the Base specimens because of pinning effect by the precipitates of carbonitrides at austenite grain boundaries. The pearlite interlamellar spacing and cementite thickness decreased with decreasing transformation temperature, while the pearlite volume fraction was hardly affected by micro-alloying elements and transformation temperature. The room-temperature tensile test results showed that the yield strength increased mostly with decreasing ferrite grain size and elongation was slightly improved as the ferrite grain size and pearlite interlamellar spacing decreased. All the specimens exhibited a discontinuous yielding behavior and the yield point elongation of the Nb4 and TiNbV specimens containing micro-alloying elements was larger than that of the Base specimens, presumably due to repetitive pinning and release of dislocation by the fine precipitates of carbonitrides.

Keywords
tensile properties
low-carbon steels
micro-alloying elements
transformation temperature
yield point elongation
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 27
  • No :4
  • Pages :184-191
  • Received Date : 2017-02-16
  • Revised Date : 2017-02-16
  • Accepted Date : 2017-03-08
  • DOI :https://doi.org/10.3740/MRSK.2017.27.4.184
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