微钙钢中第二相粒子细化晶粒效果的研究
Effect of Second Phase Particles on Refinement of Grains in Micro-calcium Steel
贾坤宁, 王海东, 姜秋月, 刘 辉
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作者单位：(长春工程学院 机电工程学院, 吉林 长春 130012)
中文关键字：微钙钢； 奥氏体； 细化晶粒
英文关键字：micro-calcium steel; austenite; fining grain
中文摘要：通过热处理试验、热模拟试验以及埋弧焊试验，研究了微钙钢中的第二相粒子对奥氏体晶粒的细化效果。结果表明：在热处理条件下微钙钢的奥氏体晶粒尺寸随保温时间的延长而增大，但增大幅度较小；热模拟条件下微钙钢当t8/5＝80 s时，模拟CGHAZ的奥氏体晶粒尺寸为80 μm，t8/5＝200 s时约为110 μm，细化效果明显；焊接条件下，未加钙钢CGHAZ的晶粒平均尺寸约为400 μm，微钙钢CGHAZ平均晶粒尺寸约为120 μm，细化效果显著。微钙钢中的第二相粒子能够有效地细化奥氏体晶粒。
英文摘要：The effect of second phase particles on fining grains in micro-calcium steel was studied through heat treatment experiment, thermal simulation experiment and submerged arc welding experiment. The results show that, under the condition of heat treatment, micro-calcium austenite grain size increases with the increase of holding time, but substantially less; under thermal simulation, when t8/5＝80 s, the simulation CGHAZ austenite grain size is 80 μm, while about 110 μm when t8/5＝200 s, the fining effect is obvious; under welding conditions, the average size of CGHAZ of no calcium steel is about 400 μm, while the micro-calcium steel is about 120 μm, the fining effect is remarkable. The second phase particles can effectively refine the austenite grain in micro-calcium steel.