Effect of Ferrite/Martensite Phase Size on Tensile Behavior of Dual-Phase Steels with Nano-Precipitation of Vanadium Carbides

Elango Chandiran, Yu Sato, Naoya Kamikawa, Goro Miyamoto, Tadashi Furuhara

研究成果: Article査読

6 被引用数 (Scopus)

抄録

This study investigates the effect of ferrite/martensite phase size and dispersion of nano-precipitates in ferrite on strength, ductility, and fracture behavior of dual-phase (DP) steels. Dispersion of nano-precipitates in ferrite improves the strength with keeping sufficient uniform elongation and post-uniform elongation, while decrease in ferrite/martensite phase size has a little effect on the increase in strength in the phase size range investigated. However, the refinement of phase size significantly improves the post-uniform elongation and reduction in area. It is concluded therefore that a simultaneous combination of refinement of ferrite/martensite phase size and dispersion of nano-precipitation in ferrite is effective to significantly improve the strength and strength–post-uniform elongation in DP steels. Quantitative analysis of void formation reveals that fracture by martensite cracking is a primary fracture mechanism in coarse phase-sized DP samples, while ferrite/martensite interface decohesion becomes a dominant fracture mechanism in fine phase-sized DP samples. It is suggested that the refinement of phase size is a promising strategy to change the fracture behavior from brittle to ductile manner, leading to an enhancement of local deformability after the necking.

本文言語English
ページ(範囲)4111-4126
ページ数16
ジャーナルMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
50
9
DOI
出版ステータスPublished - 2019 9 15

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 金属および合金

フィンガープリント

「Effect of Ferrite/Martensite Phase Size on Tensile Behavior of Dual-Phase Steels with Nano-Precipitation of Vanadium Carbides」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル