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2020 Vol.30, Issue 6 Preview Page
Yielding Behavior and Strain Aging Properties of Bake Hardening Steel with Dual-Phase Microstructure

2상 조직을 갖는 소부경화강의 항복 거동과 변형 시효 특성

Seung-Wan Lee
,
Sang-In Lee
,
Byoungchul Hwang†
이 승완
,
이 상인
,
황 병철†
Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
서울과학기술대학교 신소재공학과
†Corresponding author E-Mail : bhwang@seoultech.ac.kr (B. Hwang, Seoul Nat’l Univ. of Sci. and Tech.)
June 2020. pp. 315-320
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Abstract

This study deals with the yielding behavior and strain aging properties of three bake hardening steels with dualphase microstructure, fabricated by varying the annealing temperature. Bake hardening and aging tests are performed to examine the correlation of martensite volume fraction with yielding behavior and strain aging properties of the bake hardening steels with dual-phase microstructure. The volume fraction of martensite increases with increasing annealing temperature. Roomtemperature tensile test results show that the yielding behavior changes from discontinuous-type to continuous-type with increasing volume fraction of martensite due to higher mobile dislocation density. According to the bake hardening and aging tests, the specimen with the highest fraction of martensite exhibited high bake hardening with low aging index because solute carbon atoms in ferrite and martensite effectively diffuse to dislocations during the bake hardening test, while in the aging test they diffuse at only ferrite due to lower aging temperature.

Keywords
bake hardening steel
dual-phase
martensite
yielding behavior
strain aging
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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 : 30
  • No :6
  • Pages :315-320
  • Received Date : 2020-06-02
  • Revised Date : 2020-06-05
  • Accepted Date : 2020-06-05
  • DOI :https://doi.org/10.3740/MRSK.2020.30.6.315
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