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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80μm,t8/5=200 s时约为110μm,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400μm,微钙钢CGHAZ平均晶粒尺寸约为120μm,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。
Through heat treatment test, thermal simulation test and submerged arc welding test, the effect of the second phase particles on the austenite grain refinement was studied. The results show that the grain size of austenite increases with the increase of holding time under the condition of heat treatment, but the increase is small. Under the condition of t8 / 5 = 80 s, The grain size of CGHAZ is about 80μm and about 110μm at t8 / 5 = 200s, the refining effect is obvious. Under the condition of welding, the average grain size of CGHAZ without calcium is about 400μm, The grain size is about 120μm, the refining effect is remarkable. The second phase particles in the microcalcified steel can effectively refine the austenite grains.