Abstract: The growth behavior of austenite grain of secondary hardening ultra-high strength steel AF1410 (% : 0.165C, 14.10Co, 9.83Ni, 1.92Cr, 1.05Mo) heating at 800 ~ 1200 °C for 5 - 180 min has been studied. Results show that with increasing heating temperature and holding time the average austenite grain size of steel AF1410 increases, and the austenite grains coarsen seriously at temperature more than 1100 ℃ ; at different heating temperature; the relation between average austenite grain size of steel and holding time corresponds to Beck equation ； the math model for austenite grain growth of steel AF1410 has been established, with heating at 800〜1200 °C the average activation energy for austenite grain growth of the steel is 220.2 kJ/mol, and the relation between its average austenite grain size and heating temperature conforms to Arrhenius-type equation.

Key words: Secondary Hardening Ultra-high Strength Steel AF1410, Austenite, Grain Growth

摘要： 研究了二次硬化超高强度AF1410钢(%:0.165C、14.10Co、9.83Ni、1.92Cr、1.05Mo)在800～1200℃ 5～180 min加热的奥氏体晶粒长大行为。结果表明,AF1410钢奥氏体平均晶粒尺寸随加热温度的升高和保温时间延长而增大,加热温度超过1100℃后,奥氏体晶粒发生严重粗化;不同加热温度下,该钢的奥氏体平均晶粒尺寸与保温时间符合Beck关系;建立了AF1410钢的奥氏体晶粒长大数学模型,800～1200℃加热时,该钢奥氏体晶粒长大平均激活能为220.2 kJ/mol,其奥氏体平均晶粒尺寸与加热温度之间符合Arrhenius关系。

关键词: 二次硬化超高强度钢AF1410, 奥氏体, 晶粒长大