SCr420H钢奥氏体晶粒长大动力学

doi:10.13228/j.boyuan.issn0449-749x.20170585

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摘要试验研究了SCr420H钢的晶粒长大动力学行为，并根据第二相的固溶积公式和晶粒长大驱动力的定理，通过奥氏体晶粒尺寸进行分析。结果表明，SCr420H钢随着保温温度的升高和保温时间的延长，第二相颗粒逐渐减少，钉扎效果较弱，试验中的晶粒长大较为明显，晶粒逐渐粗化。结合实际晶粒尺寸和第二相的熟化长大原理，SCr420H在保温4 h条件下，随着温度升高，第二相溶解较少，晶粒长大速率趋于由慢到快；在5、6 h保温条件下，随着温度升高，晶粒尺寸稳定增长，最后趋向停止；当保温温度在1 020 ℃以上时，混晶现象较为明显。初始晶粒尺寸为24 μm，晶粒长大符合Beck方程和Hillert晶粒长大规律，奥氏体晶粒长大的平均激活能为564.6 kJ/mol。

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	汪杨鑫
	赵秀明
	毛向阳
	卜凡
	汪弯

关键词 ：第二相, 晶粒长大, 激活能, 奥氏体

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.

收稿日期: 2017-12-04 出版日期: 2018-07-24

PACS:	中图分类号：TG142.1
	TG306

引用本文:

汪杨鑫，赵秀明，毛向阳，卜凡，汪湾，安金敏. SCr420H钢奥氏体晶粒长大动力学[J]. , 2018, 53(7): 80-84. WANG Yang-xin，，ZHAO Xiu-ming，，MAO Xiang-yang，，BU Fan，，WANG Wan，，AN Jin-min. Kinetics of austenite grain growth in SCr420H steel. Iron and Steel, 2018, 53(7): 80-84.

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