MISC

2017年9月

Work Hardening, Dislocation Structure, and Load Partitioning in Lath Martensite Determined by In Situ Neutron Diffraction Line Profile Analysis

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
  • Stefanus Harjo
  • ,
  • Takuro Kawasaki
  • ,
  • Yo Tomota
  • ,
  • Wu Gong
  • ,
  • Kazuya Aizawa
  • ,
  • Geza Tichy
  • ,
  • Zengmin Shi
  • ,
  • Tamas Ungar

48A
9
開始ページ
4080
終了ページ
4092
記述言語
英語
掲載種別
DOI
10.1007/s11661-017-4172-0
出版者・発行元
SPRINGER

A lath martensite steel containing 0.22 mass pct carbon was analyzed in situ during tensile deformation by high-resolution time-of-flight neutron diffraction to clarify the large work-hardening behavior at the beginning of plastic deformation. The diffraction peaks in plastically deformed states exhibit asymmetries as the reflection of redistributions of the stress and dislocation densities/arrangements in two lath packets: soft packet, where the dislocation glides are favorable, and hard packet, where they are unfavorable. The dislocation density was as high as 10(15) m(-2) in the as-heat-treated state. During tensile straining, the load and dislocation density became different between the two lath packets. The dislocation character and arrangement varied in the hard packet but hardly changed in the soft packet. In the hard packet, dislocations that were mainly screw-type in the as-heat-treated state became primarily edge-type and rearranged towards a dipole character related to constructing cell walls. The hard packet played an important role in the work hardening in martensite, which could be understood by considering the increase in dislocation density along with the change in dislocation arrangement.

Web of Science ® 被引用回数 : 9

リンク情報
DOI
https://doi.org/10.1007/s11661-017-4172-0
J-GLOBAL
https://jglobal.jst.go.jp/detail?JGLOBAL_ID=201702277026772803
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000406486700014&DestApp=WOS_CPL
URL
http://jglobal.jst.go.jp/public/201702277026772803