Microstructure and mechanical properties of ausformed ultra high-strength TRIP-aided steels

Koh Ichi Sugimoto, Mitsuhiro Itoh, Tomohiko Hojo, Shun Ichi Hashimoto, Shushi Ikeda, Goro Arai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

Ultra high-strength low-alloyed TRIP-aided steels possess high impact toughness, fatigue strength and hydrogen embrittlement performance, as well as good formability. So, it is expected that the TRIP-aided steels are applied to some automotive parts such as not only center pillar but also driving parts, spring and bolts. In the present study, the effects of ausforming conditions (temperature and strain) after austenitizing on tensile properties and toughness of TRJJP-aided steels with bainitic ferrite matrix were investigated to develop a new type of ultra high-strength forging steel. TRIP-aided steel with chemical composition of 0.2%C, 0.5%Si, 1.5%Mn, 1.0%Al, 0.02%Nb and 0.1 %Mo achieved large total elongation and high impact toughness by ausforming to 0-50% strain at 600-900°C, followed by austempering at 400°C for 500s. This was mainly caused by refined microstructure and stabilized retained austenite.

Original languageEnglish
Title of host publicationSupplement to THERMEC 2006, 5th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2006
PublisherTrans Tech Publications Ltd
Pages4309-4314
Number of pages6
EditionPART 5
ISBN (Print)0878494286, 9780878494286
DOIs
Publication statusPublished - 2007 Jan 1
Externally publishedYes
Event5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006 - Vancouver, Canada
Duration: 2006 Jul 42006 Jul 8

Publication series

NameMaterials Science Forum
NumberPART 5
Volume539-543
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

Other5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006
CountryCanada
CityVancouver
Period06/7/406/7/8

Keywords

  • Ausforming
  • High strength steel
  • Microstructure
  • Retained austenite
  • TRIP-aided steel
  • Tensile properties
  • Toughness

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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