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利用模拟试验机对Q460耐候钢不同热输入条件下的焊接粗晶热影响区进行模拟,分析粗晶热影响区中显微组织及其中马氏体-奥氏体(M-A)组元的数量、形态、分布及大小对韧性的影响。结果表明,t8/5较小时,组织由板条贝氏体和粒状贝氏体构成,M-A组元尺寸较小;t8/5为100 s时,组织中板条贝氏体量逐渐减小,粒状贝氏体含量逐渐增多,M-A呈块状,尺寸变大,有效晶粒尺寸增加,韧性降低;当t8/5达到150~200 s时,即使组织粗大,M-A组元的量有所减少,出现部分残留奥氏体,韧性也会增加。
The simulated coarse heat-affected zone of Q460 weathering steel under different heat input conditions was simulated by simulative testing machine, the number of microstructure and the content of martensite-austenite (MA) in coarse heat-affected zone was analyzed, Effect of morphology, distribution and size on toughness. The results showed that the tissue consisted of lath bainite and granular bainite with smaller t8 / 5, and the size of MA component was smaller. At t8 / 5 of 100 s, the amount of lath bainite in the tissue gradually decreased, Granular bainite content gradually increased, MA lumps, the size becomes larger, the effective grain size increases, the toughness decreases; when t8 / 5 reaches 150 ~ 200 s, even if the tissue coarse, the amount of MA components decreased, Some retained austenite, toughness will increase.