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Open AccessArticle

Microstructures and Mechanical Properties of 7Mn Steel Manufactured by Different Rolling Processes

by Bin Hu 1 and Haiwen Luo 1,2,*
1
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xue Yuan Lu 30, Beijing 100083, China
2
Central Iron and Steel Research Institute, Xue Yuan Nan Lu 30, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Metals 2017, 7(11), 464; https://doi.org/10.3390/met7110464
Received: 28 September 2017 / Revised: 19 October 2017 / Accepted: 27 October 2017 / Published: 1 November 2017
(This article belongs to the Special Issue Medium-Mn Steels, a Promising Type of the 3rd Generation Steels)
We investigated both the microstructures and tensile properties of 7Mn steel, which was either hot-rolled, warm-rolled or cold-rolled before intercritical annealing at 700 °C for 5 h. It can be concluded that the warm-rolled and annealed microstructures are a kind of mixture of hot rolled and cold rolled ones. They are composed of ferrite and retained austenite, the latter having a wide size distribution and two types of morphologies: equiaxed and lamellar. These retained austenite grains are expected to transform to martensite in a more sustainable way—the warm-rolled and annealed steel exhibits the best combination of ultimate tensile strength and total elongation among the three studied steels and a shorter yield point elongation than the cold-rolled one. View Full-Text
Keywords: cold rolling; warm rolling; hot rolling; microstructure; tensile properties; medium Mn steel cold rolling; warm rolling; hot rolling; microstructure; tensile properties; medium Mn steel
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Hu, B.; Luo, H. Microstructures and Mechanical Properties of 7Mn Steel Manufactured by Different Rolling Processes. Metals 2017, 7, 464.

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