• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Phase Transformation of Dynamically Recrystallized Austenite

Research Project

Project/Area Number 06650795
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Material processing/treatments
Research InstitutionThe University of Electro-Communications (UEC)

Principal Investigator

SAKAI Taku  UEC,Faculty of EC,Professor, 電気通信学部, 教授 (40017364)

Co-Investigator(Kenkyū-buntansha) MIURA Hiromi  UEC,Faculty of EC,Assistant Professor, 電気通信学部, 講師 (30219589)
除 洲  上海交通大学, 助教授
XU Zhou  UEC,Faculty of EC,Associate Professor
徐 洲  電気通信大学, 電気通信学部, 助教授
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1994: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsHot Deformation / Dynamic recovery / Dynamic recrystallization / Dislocation substructure / Grain refinement / Diffusion transformation / Martensite transformation / Thermomechanical treatment / 動的回復組織 / 動的再結晶組織 / マルテンサイト組織
Research Abstract

Static recovery and recrystallization taking place in dynamically recrystallized (DRX) matrices and the effect of them on the austenite to ferrite phase transformation were studied by using plain carbon, IF (interstitial free) and nickel alloy steels. The main results are summarized as follows.
1. Static restoration processes taking place in DRX matrices are metadynamic recovery and recrystallization as well as classical static recovery and recrystallization. The static softening curves under annealing of DRX matrices indicate three steps and do not go to full softening for a long period of annealing time. It is concluded that DRX grain structures can exist stably at high temperatures.
2. DRX grains are classified into the following categories ; dynamic nuclei, growing DRX grains which contain a dislocation density gradient and coarser DRX grains containing a uniformly distributed dislocation substructures. The growing DRX grains results in the three steps of softening and incomplete softening taking place in DRX matrices.
3. Static softening in DRX austenite of plain carbon steels is accerated initially by increasing of carbon content and, in contrast, the values of incomplete softening increase with carbon content.
4. Finer DRX austenite grains in IF steels lead to the evolution of finer ferrite grains compared with usual grains. Ferrite grains scarcely grow even after annealing of DRX austenite for a long period of time. These results from the stable existence of growing grains in DRX matrices.
5. Martensite transformation takes place rapidly and the microstructures transformed are more refined in DRX matrices compared with those in usual matrices.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Taku Sakai: "Dynamic Recrystallization Microstructures under Hot Working Conditions" Journal of Materials Processing and Technology. 53. 349-361 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Z.Xu,G.Zhang and T.Sakai: "Effefct of Carbon Content on Static Restoration of Hot Worked Plain Carbon Steel" ISIJ International. 35. 210-216 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Taku Sakai: "Dynamic Recrystallization Microstructures under Hot Working Conditions" Journal of Materials Processing and Technology. 53. 349-361 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Z.Xu, G.Zhang and T.Sakai: "Effefct of Carbon Content on Static Restoration of Hot Worked Plain Carbon Steels" ISIJ International. 35. 210-216 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Taku Sakai: "Dynamic Recrystallization Microstructures under Hot Working Conditions" Journal of Materials Processing and Technology. 53. 349-361 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Z.Xu, G.Zhang,T.Sakai: "Effect of Carbon Content on Static Restoration of Hot Worked Plain Carbon" ISIJ International. 35. 210-216 (1995)

    • Related Report
      1995 Annual Research Report

URL: 

Published: 1994-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi