本文選題：熱軋帶鋼 + 氧化鐵皮��； 參考：《沈陽大學(xué)》2016年碩士論文

【摘要】：本文以Fe-0.6Si鋼為實(shí)驗(yàn)材料,采用管式電阻加熱爐模擬在實(shí)際生產(chǎn)過程的溫度區(qū)間Fe-0.6Si鋼氧化鐵皮組織轉(zhuǎn)變規(guī)律。模擬了在降溫過程中FeO的等溫轉(zhuǎn)變和升溫過程中氧化鐵皮結(jié)構(gòu)的轉(zhuǎn)變實(shí)驗(yàn),采用金相顯微鏡觀察氧化鐵皮在降溫和升溫過程厚的斷面形貌,用SEM觀察氧化鐵皮內(nèi)部組織結(jié)構(gòu)。采用四個(gè)模擬酸洗槽來模擬工業(yè)酸洗流程,研究了不同位置處氧化鐵皮結(jié)構(gòu)對(duì)酸洗的影響。通過以上實(shí)驗(yàn),本論文的工作和成果如下:通過對(duì)Fe-0.6Si鋼在降溫過程中FeO等溫轉(zhuǎn)變的研究發(fā)現(xiàn),在等溫氧化過程中,由于受離子濃度、體系中自由能以及過冷度的影響,氧化鐵皮在400℃、450℃和500℃時(shí)等溫轉(zhuǎn)變時(shí),在金相檢測(cè)中可以發(fā)現(xiàn)先共析Fe_3O_4相,沒有出現(xiàn)共析產(chǎn)物;在550℃到650℃區(qū)間沒有出現(xiàn)先共析組織和共析組織。總結(jié)出了FeO等溫轉(zhuǎn)變規(guī)律,該規(guī)律遵循“C”曲線原則。在低氧壓條件下降溫過程中由于氧含量很少,生成的氧化鐵皮層中沒有Fe_2O_3,可以觀察到先共析Fe_3O_4和共析產(chǎn)物Fe和Fe_3O_4。在低氧壓條件下升溫過程中等溫轉(zhuǎn)變行為的研究中發(fā)現(xiàn),氧化鐵皮共析組織中的鐵和四氧化三鐵在升溫的過程中會(huì)發(fā)生逆轉(zhuǎn)變生成氧化亞鐵,并且氧化鐵皮層中的先共析四氧化三鐵也能發(fā)生逆轉(zhuǎn)變生成氧化亞鐵。同時(shí)可以得出目標(biāo)溫度越高,有利于共析組織和先共析組織逆轉(zhuǎn)變的反應(yīng)過程。通過模擬酸洗實(shí)驗(yàn),比較不同結(jié)構(gòu)氧化鐵皮的酸洗難易程度發(fā)現(xiàn),氧化鐵皮厚度和宏觀裂紋都會(huì)影響酸洗速率。其中氧化鐵皮厚度影響較大,氧化鐵皮越厚,酸洗的時(shí)間越長(zhǎng)。但是氧化鐵皮厚度決定了在拉矯過程中是否產(chǎn)生宏觀裂紋。產(chǎn)生裂紋會(huì)提高酸洗速率。
[Abstract]:In this paper, using Fe-0.6Si steel as experimental material, the microstructure transformation law of Fe-0.6Si steel oxide sheet in the temperature range of actual production process is simulated by tube resistance furnace. The isothermal transformation of FeO during cooling and the transformation of the structure of iron oxide in the process of heating up were simulated. The section morphology of iron oxide in the process of cooling and heating was observed by metallographic microscope, and the internal structure of iron oxide was observed by SEM. Four simulated pickling tanks were used to simulate the industrial pickling process. Through the above experiments, the work and results of this paper are as follows: through the study of the isothermal transition of Fe-0.6Si steel during the cooling process, it is found that the free energy and the undercooling degree of the system are affected by the concentration of ions in the isothermal oxidation process. During the isothermal transformation of iron oxide sheet at 400 鈩，

本文編號(hào)：1895831