【摘要】：實(shí)驗(yàn)室條件下研究了低碳鋼表面氧化鐵皮在連續(xù)冷卻過(guò)程中的組織轉(zhuǎn)變,分析了卷取溫度和冷卻速率對(duì)Fe1-yO相變的影響。在不同連續(xù)冷卻條件下,最終的氧化鐵皮結(jié)構(gòu)可分為兩類,第一類氧化鐵皮只包含先共析Fe3O4和殘余Fe1-yO;第二類氧化鐵皮由共析組織、先共析Fe3O4和少量殘余Fe1-yO組成。結(jié)果表明,低冷卻速率有利于共析反應(yīng)的發(fā)生。在400~500℃,Fe1-yO最不穩(wěn)定,在該溫度區(qū)間卷取,最終氧化鐵皮中將出現(xiàn)大量的共析組織。當(dāng)卷取溫度遠(yuǎn)高于570℃,Fe2+在Fe1-yO中擴(kuò)散,使Fe1-yO的陽(yáng)離子空位濃度降低,穩(wěn)定性提高,這種Fe1-yO的共析轉(zhuǎn)變需要更長(zhǎng)時(shí)間,最終的氧化鐵皮中共析組織含量較低。
[Abstract]:The microstructure transition of oxidized iron sheet on the surface of low carbon steel during continuous cooling was studied under laboratory conditions. The effects of coiling temperature and cooling rate on Fe1-yO phase transition were analyzed. Under different continuous cooling conditions, the final structure of iron oxide can be divided into two categories. The first type consists of only preeutectoid Fe3O4 and residual Fe1-yO;. The second kind consists of eutectoid structure, proeutectoid Fe3O4 and a small amount of residual Fe1-yO. The results show that low cooling rate is propitious to the occurrence of eutectoid reaction. Fe1-yO is the most unstable at 400 鈩，

本文編號(hào)：2240894