Effects of warm working on microstructural and shear deformation properties of TRIP-aided martenitic steel

Tomohiko Hojo, Takuya Kochi, Koh Ichi Sugimoto

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

Abstract

The effects of warm working on microstructural, retained austenite characteristics and shear deformation properties of 0.2C-1.5Si-1.5Mn-1.0Cr-0.2Mo TRIP-aided martensitic (TM) steel for applications to automotive frame and forging parts were investigated. When warm working at 550 oC and post cooling at 1 oC/s was conducted to the TM steel, volume fractions of retained austenite and martensite-austenite constituent phase increased and mixture matrix of ultra fine granular bainitic ferrite and fine bainitic ferrite lath was obtained, whereas microstructure of TM steel warm worked at 750 oC exhibited granular bainitic ferrite matrix. These were caused by the dynamic recrystallization and the promotion of bainitic transformation of austenite due to the worm forging at 550 oC with the post cooling rate of 1 oC/s. Maximum shear stress decreased and total shear displacement increased with decreasing working temperature in TM steel. These were caused by the effective strain induced transformation of a large amount of retained austenite and the refined matrix structure.

Original languageEnglish
Title of host publicationTHERMEC 2016
EditorsChristof Sommitsch, Mihail Ionescu, Brajendra Mishra, Brajendra Mishra, Ernst Kozeschnik, T. Chandra
PublisherTrans Tech Publications Ltd
Pages2312-2317
Number of pages6
ISBN (Print)9783035711295
DOIs
Publication statusPublished - 2017
Externally publishedYes
Event9th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2016 - Graz, Austria
Duration: 2016 May 292016 Jun 3

Publication series

NameMaterials Science Forum
Volume879
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

Other9th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2016
CountryAustria
CityGraz
Period16/5/2916/6/3

Keywords

  • Retained austenite
  • Shear deformation properties
  • TRIP-aided martensitic steel
  • Ultra fine grain
  • Warm working

ASJC Scopus subject areas

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

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