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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 3    March 2019

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Super long-range diffusion of carbon during proeutectoid ferrite transformation
ZHANG Suo-quan(张所全)1, 2, JIAO Si-hai(焦四海)2, DING Jian-hua(丁建华)2, WAN Di(万迪)3, LIU Zhen-yu(刘振宇)1, WANG Guo-dong(王国栋)1

1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, China;
2. Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China;
3. Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, Richard Birkelands vei 2B, NO-7491 Trondheim, Norway

Abstract:In order to explore the possible diffusion distance of carbon during proeutectoid ferrite transformation, a slow cooling test of low carbon steel was carried out under vacuum of the thermal simulator. The microstructure and thermal expansion curve were discussed and the carbon concentration inside the sample was measured. The ferrite layer of about 450 μm thickness was obtained without pearlite on the surface of the sample in the microstructure. The thermal expansion curve shows that the ferrite layer without pearlite is formed during the local phase transformation, which is followed by the global transformation. The carbon concentration in the core of the sample (0.061%) is significantly higher than that of the bulk material (0.054%). All results show that carbon has long-range diffusion from the outer layer to the inner layer of the sample. The transformation is predominantly interface-controlled mode during local transformation, and the interface migration rate is about 2.25 μm/s.

 

Key words: low carbon steel; local transformation; super long-rang diffusion; interface-controlled mode

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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