Desenvolvimento da microestrutura em aço médio carbono durante deformação a quente

http://www.sciencedirect.com/science/article/pii/S0921509312002754

Materials Science and Engineering: A
Volume 543, 1 May 2012, Pages 267–270

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Warm deformation behavior of medium carbon steel with different initial microstructures * X. Zhaoa, , , * T.F. Jingb * a The Six Department, Zhengzhou Institute of Aeronautics, Zhengzhou 450015, China * b State Key Laboratory of Metastable Materials Science and Technology, Qinhuangdao 066004, China * Received 23 June 2011. Revised 15 December 2011. Accepted 12 February 2012. Available online 28 February 2012. * http://dx.doi.org/10.1016/j.msea.2012.02.057, How to Cite or Link Using DOI * Cited by in Scopus (0) * Permissions & Reprints
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Abstract
Specimens with ferrite + pearlite (F + P) and martensite (M) microstructures were compressed under warm conditions. The flow curves of quenched specimens were below those of annealed specimens at 873–973 K (600–700 °C) and a strain rate of 0.001 s−1. This was due to the tempering and dynamic recrystallization of martensite.

Highlights
► Effect of initial microstructure on warm forming behavior in medium carbon steel. ► The flow stress of ferrite + pearlite is higher than that of martensite at 873–973 K. ► Warm deformation promotes tempering and dynamic recrystallization in martensite.
Keywords
* Bulk deformation; * Steel; * Microstructure

Figures and tables from this article:

Fig. 1. Initial microstructure of the specimens. (a) As-annealed condition; (b) as-quenched condition.
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Fig. 2. Flow curves of the specimens deformed at the strain rate of 0.1 s−1.
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Fig. 3. Flow curves of the specimens deformed at the strain rate of 0.01 s−1.
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Fig. 4. Flow curves of the specimens deformed at the strain rate of 0.001 s−1.
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Fig. 5. Microstructure of the quenched specimens compressed at the strain rate of 0.01 s−1. (a) Deformed at