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Mechanism of hot ductility loss in C–Mn steels based on nonequilibrium grain boundary segregation of impurities

Published online by Cambridge University Press:  24 April 2015

Zongwen Zheng ,
Hongyao Yu ,
Zhenjun Liu ,
Tingdong Xu  and
R. Devesh K. Misra
Zongwen Zheng*
Affiliation:
Superalloy Department, Central Iron & Steel Research Institute, Beijing 100081, People's Republic of China
Hongyao Yu
Affiliation:
Superalloy Department, Central Iron & Steel Research Institute, Beijing 100081, People's Republic of China
Zhenjun Liu
Affiliation:
Superalloy Department, Central Iron & Steel Research Institute, Beijing 100081, People's Republic of China
Tingdong Xu
Affiliation:
Superalloy Department, Central Iron & Steel Research Institute, Beijing 100081, People's Republic of China
R. Devesh K. Misra
Affiliation:
Department of Metallurgical and Materials Engineering, Center for Structural and Functional Materials Research and Innovation, University of Texas at El Paso, El Paso, Texas 79968, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The subject of hot ductility in C–Mn steels has been the focus of interest for a long time in materials science and engineering. However, the mechanism of loss in hot ductility continues to be unclear. In the present paper, the experimental hot ductility data in C–Mn steels involve: (i) a ductility trough appears at a certain temperature when the sample is held for a certain time at various temperatures after cooling quickly from a higher temperature; (ii) the ductility healing phenomenon which occurs with the duration of holding time; (iii) the ductility deteriorates with the increase of temperature difference between solution treatment temperature and test temperature during a tensile test; (iv) a minimum ductility appears when samples are cooled from a higher temperature to a lower one at a certain cooling rate; and (v) the formation of cavities at grain boundaries during tests. All of these are analyzed and calculated from the perspective of thermally induced nonequilibrium grain-boundary segregation (TNGS). Based on our detailed analyses, the loss in hot ductility of C–Mn steels is ascribed to TNGS of impurities.

Keywords

hot ductility lossC–Mn steelimpuritiesgrain-boundary segregation
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 10 , 28 May 2015 , pp. 1701 - 1714
Copyright
Copyright © Materials Research Society 2015 

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