Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 3, Pages 745-751Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.08.048
Keywords
Recrystallization; Twinning-induced plasticity; Carbide precipitation; Ductility; Grain size; Dimple
Categories
Funding
- Ministry of Commerce, Industry and Energy, Republic of Korea
- Korea Evaluation Institute of Industrial Technology (KEIT) [K0001343] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The microstructure, dimple structure, and mechanical properties of a cold-rolled Fe-18Mn-0.6C-1.5Al TWIP steel were investigated as a function of annealing temperature. The recrystallization started at 600 degrees C and finished at 700 degrees C for the holding time of 10 min. The coarsening rate of recrystallized grains was increased over about 840 degrees C and Rockwell hardness was greatly decreased between 800 and 900 degrees C, which shows a good agreement with the equilibrium dissolution temperature of M3C carbides. The reversion of the tensile strength occurred between 700 and 800 degrees C because of the carbide precipitation hardening. The precipitation-time-temperature diagram was generated by dilatometric tests, showing a nose temperature of 800 degrees C. The dimple size was decreased to 700 degrees C and then increased again with higher annealing temperature, having a strong proportional relationship with austenite grain size. (c) 2009 Elsevier B.V. All rights reserved.
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