Formation of ultrafine grained ferrite by warm deformation of tempered lath martensite in low alloy steels

B. Poorganji, T. Yamaguchi, T. Maki, G. Miyamoto, T. Furuhara

研究成果: Conference contribution

11 被引用数 (Scopus)

抄録

Microstructure change during warm deformation of tempered lath martensite in Fe-2mass%Mn-C alloys with different carbon contents in the range between 0.1 and 0.8mass%C was investigated. Specimens of the alloys after being quenched and tempered at 923K for 0.3ks were compressed by 50% with a strain rate varying from 10-3 to 10"V at 923K. EBSD analysis of the deformed microstructures has revealed that fine equiaxed ferrite (a) grains surrounded by high-angle boundaries are formed by dynamic recrystallization (DRX). As carbon content increases, the DRX a grain size decreases. This could be attributed to the change in volume fraction of the cementite (6) phase as boundary dragging particles. The sub-micron 9 particles can suppress the coarsening of the DRX a grains by exerting a pinning effect on grain boundary migration. Furthermore, the fraction of recrystallized region increases by increasing carbon content, presumably due to a decrease in the martensite block width as an initial a grain size and a larger volume fraction of hard second phase (6) particles. Both of these should increase inhomogeneous plastic deformation which promotes the recrystallization. It seems that continuous DRX is responsible for the formation of ultrafine a grains in the tempered lath martensite.

本文言語English
ホスト出版物のタイトルRecrystallization and Grain Growth III - Proceedings of the Third International Conference on Recrystallization and Grain Growth, ReX and GG III
出版社Trans Tech Publications Ltd
ページ557-562
ページ数6
PART 1
ISBN(印刷版)087849443X, 9780878494439
DOI
出版ステータスPublished - 2007
イベント3rd International Conference on Recrystallization and Grain Growth, ReX GG III - Jeju Island, Korea, Republic of
継続期間: 2007 6 102007 6 15

出版物シリーズ

名前Materials Science Forum
番号PART 1
558-559
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

Other

Other3rd International Conference on Recrystallization and Grain Growth, ReX GG III
国/地域Korea, Republic of
CityJeju Island
Period07/6/1007/6/15

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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