文档介绍：Mg 处理对 FH40 级船板钢奥氏体晶粒长大行为影响
李小兵 1,闵义 1,刘承军 1,王博 2,姜茂发 1
(1 东北大学多金属共生矿生态化冶金教育部重点实验室,辽宁,沈阳 110819
2 山钢集团莱芜钢铁集团有限公司,山东莱芜 271104)
摘要为了揭示 Mg 对低碳微合金钢大热焊接过程中奥氏体晶粒长大的影响,本文以 FH40 船板钢为研究对象,利用真空
感应炉制备了不同 Mg 处理水平的实验钢,采用金相分析法和原位观察法研究了不同加热温度下 Mg 处理对实验钢原始奥
氏体晶粒长大和冷却转变行为的作用效果,并在此基础上,对实验钢奥氏体晶粒变温长大动力学方程进行了数学回归分析。
结果表明,在 1000℃~1200℃,Mg 处理对奥氏体晶粒细化作用并不明显,在 1300℃时,Mg 质量分数为 %时细化效
n
果较为明显。数学回归分析表明,Mg 能同时降低奥氏体晶粒长大激活能和 K0t 数值,最终表现为利于奥氏体晶粒细化。
1400℃原位观察实验表明,%Mg 处理能有效延后奥氏体晶粒粗化时间;在过冷奥氏体转变过程中 Mg 处理钢具有较
低的γ→α转变开始温度,相转变前沿晶内铁素体形核数量高于基准钢。
关键词 FH40 船板钢;Mg;奥氏体;动力学方程
Effect of Trace Mg Treatment on the Austenite Grain Growth in FH40 Ship
Plates Steel
Li Xiaobing1, Min Yi1, Liu Chengjun1, Wang Bo2, Jiang Maofa1
(1 Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education) Liaoning, Shenyang, 110819, China
2 The Steel of Plant of Laiwu Iron and Steel Group Co., Ltd., Shandong, Laiwu,271104)
Abstract: In order to reveal the effect of Mg addition on the austenite grain growth in low carbon during high heat input welding
process, the FH40 ship plates containing different Mg content were refined with vacuum induction furnace, and the austenite grain
growth and phase transformation behavior of Mg-treated steels were investigated by metallographic and in situ observation. The
ic equations of austenite grain growth were established by regres