Formation of martensite austenite constituent in continuously cooled Nb-bearing low carbon steels

N. Takayama, G. Miyamoto, N. Kamikawa, H. Nako, T. Maki, T. Furuhara

研究成果: Conference contribution

4 被引用数 (Scopus)

抄録

Fe-0.15%C-1.5%Mn-0.2%Si (Nb-free alloy) and Fe-0.15%C-1.5%Mn-0.2%Si-0.03%Nb (Nb-added alloy) were continuously cooled to room temperature at constant cooling rates in the range from 0.1 to 20K/s. At lower cooling rates, such as 0.1K/s, the Nb addition retards the ferrite transformation, resulting in a decrease in the transformation temperature and an increase in the volume fraction of bainite. The fraction of martensite-austenite constituent (MA) increases by the Nb addition and the largest fraction of MA, about 0.5 %, is observed in the Nb-added specimen cooled at 5K/s. In the specimens cooled at 5K/s, relatively coarse bainite without cementite precipitation is formed near the austenite (γ) grain boundary in both alloys. Most of MA is localized between such relatively coarse bainitic ferrite (BF). On the other hand, MA is hardly observed in the bainite formed with cementite precipitation in γ grain. Based on microstructure observation of the continuously cooled specimens down to intermediate temperatures followed by quenching, it is concluded that small-sized untransformed γ near γ grain boundary partly remains as MA whereas relatively larger untransformed γ in the γ grain decompose into bainite with cementite precipitation.

本文言語English
ホスト出版物のタイトルTHERMEC 2009
編集者Tara Chandra, Tara Chandra, Tara Chandra, N. Wanderka, N. Wanderka, N. Wanderka, Walter Reimers, Walter Reimers, Walter Reimers, M. Ionescu, M. Ionescu, M. Ionescu
出版社Trans Tech Publications Ltd
ページ3080-3085
ページ数6
ISBN(印刷版)0878492941, 9780878492947
DOI
出版ステータスPublished - 2010
イベント6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009 - Berlin, Germany
継続期間: 2009 8 252009 8 29

出版物シリーズ

名前Materials Science Forum
638-642
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

Other

Other6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009
国/地域Germany
CityBerlin
Period09/8/2509/8/29

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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