Investigation on the Austenitic Reverse Transformation of 0.2C-3Mn-1.7Si Steel with an Ultra-Slow Heating Rate

Bao Xiang Zhang; Xiao Lu Gui; Gu Hui Gao; Zhun Li Tan; Bing Zhe Bai

doi:10.4028/www.scientific.net/AMR.1004-1005.214

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1004-1005Investigation on the Austenitic Reverse...

Investigation on the Austenitic Reverse Transformation of 0.2C-3Mn-1.7Si Steel with an Ultra-Slow Heating Rate

Abstract:

In order to clarify the austenite reverse transformation of a 0.2C-3Mn-1.7Si steel during intercritical region with an ultra-slow heating rate of 0.05°C/s, DIL (dilatometer), SEM, XRD and EPMA were carried out. The experimental results indicated that the dilatometric cures exhibited the shape of two “valleys” and the growth of austenite from quenched martensite was composed of three consecutive sub-stages. This phenomenon is associated with Mn-rich and Mn-poor regions in martensite matrix. During the heat treatment,the austenite forms firstly in region enriched in Mn. However, with increasing temperature, the growth of γ is restrained owing to the concentration of Si. Upon the further process of heating, the free energy for the reverse transformation increases, and the residual Mn-depleted regions start to transform at a higher temperature.

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Periodical:

Advanced Materials Research (Volumes 1004-1005)

Pages:

214-220

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1004-1005.214

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Online since:

August 2014

Authors:

Bao Xiang Zhang, Xiao Lu Gui*, Gu Hui Gao, Zhun Li Tan, Bing Zhe Bai

Keywords:

Heating Rate, Intercritical Region, Quenched Martensite, Reverse Transformation

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