Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 636, Issue -, Pages 53-59Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.03.095
Keywords
Partial austenitization; Q-P steel; Retained austenite; Mechanical properties; Strain hardening
Categories
Funding
- National Natural Science Foundation of China [51031001]
- Department of Metallurgical and Materials Engineering, University of Texas at El Paso, USA
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The high strength and good formability in low-carbon quenching and partitioning (Q-P) steels has been successfully obtained by full or partial austenization before Q-P process. In this regard, we have studied the effect of annealing conditions on the microstructural variation and the consequent strain hardening behaviors in a low-carbon Q-P steel. The microstructures of Q-P steels subjected to different annealing treatments were studied in details by a host of material characterization techniques including electron microscopy, electron microprobe and x-ray diffraction techniques. The study suggests that intercritical annealing is beneficial in increasing the volume fraction of retained austenite, which is the consequence of distribution of alloying elements during intercritical annealing and it enhances the stability of intercritically annealed austenite. Meanwhile, compared with the full austenitizing Q-P steel, the strain hardening of partial austenitizing Q-P steel is enhanced by the presence of intercritical ferrite and increasing volume fraction of retained austenite. (C) 2015 Elsevier B.V. All rights reserved.
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