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| Kinetics of austenite grain growth in SCr420H steel |
| WANG Yang-xin1,2，ZHAO Xiu-ming1,2，MAO Xiang-yang1,2，BU Fan1,2，WANG Wan1,2，AN Jin-min3 |
（1. School of Material Engineering， Nanjing Institute of Technology， Nanjing 211167， Jiangsu， China
2. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology， Nanjing 211167， Jiangsu， China
3. Special Steel Research and Development Center of Research Institute， Baoshan Iron and Steel Co.， Ltd.， Shanghai 200940， China） |
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Abstract The crystal growth behavior of SCr420H steel was studied. According to the solid solution formula of the second phase and the maximum the driving force of grain growth，the results were analyzed by the austenite grain size. Therefore，the result of SCr420H steel shows that the second phase particles are gradually reducing and the pinning effect weakly with the increase of holding temperature and the holding time. Grain growth is obvious，and grain size become coarsening gradually. Combined with the actual grain size and principle of Ostwald ripening growth in the second phase，the second phase dissolved less in the insulation 4 h conditions with the temperature rise，and the grain growth rate tends to slow to fast. Under the condition of temperature keeping in 5 and 6 h，the grain size grows steadily with the temperature increasing，and the speed of the growth tends to stop finally. When the holding temperature is above 1 020 ℃，the mixed crystal is more obvious. The initial grain size is 24 μm，and the grain growth of law accordance with Beck equation and Hillert grain growth law. The average activation energy of austenite grain growth is 564.6 kJ/mol.
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Received: 04 December 2017
Published: 24 July 2018
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2018, Vol. 53 
