【摘要】：以FH40高強(qiáng)度級別船板鋼為研究對象,利用真空感應(yīng)爐冶煉了不同Mg、Zr成分的實(shí)驗(yàn)鋼,采用Gleeble-3800熱模擬試驗(yàn)機(jī)測定了實(shí)驗(yàn)鋼連續(xù)冷卻轉(zhuǎn)變曲線(CCT)。采用金相顯微鏡系統(tǒng)研究了實(shí)驗(yàn)鋼連續(xù)冷卻條件下的組織演變規(guī)律,并探討了Mg、Zr單獨(dú)和復(fù)合添加對實(shí)驗(yàn)鋼CCT曲線中鐵素體和貝氏體相區(qū)的作用規(guī)律。結(jié)果表明,Mg、Zr及Mg-Zr添加均能影響過冷奧氏體和珠光體開始轉(zhuǎn)變溫度;Mg和Mg-Zr添加抑制了鐵素體轉(zhuǎn)變,促進(jìn)了貝氏體轉(zhuǎn)變,在5~30℃/s冷卻速度范圍內(nèi)均獲得以貝氏體為主的組織;Zr添加擴(kuò)大了鐵素體區(qū),減小了貝氏體區(qū),冷卻速度提高至20℃/s以上可得到以貝氏體為主的組織。研究結(jié)果對進(jìn)一步明確Mg、Zr對低碳微合金鋼組織特征的作用規(guī)律,指導(dǎo)Mg、Zr及Mg-Zr處理在工業(yè)上的應(yīng)用具有重要意義。
[Abstract]:Taking FH40 high strength ship plate steel as the research object, the experimental steel with different Mg,Zr composition was smelted by vacuum induction furnace, and the continuous cooling transformation curve (CCT). Of the experimental steel was measured by Gleeble-3800 thermal simulation testing machine. The microstructure evolution of experimental steel under continuous cooling condition was studied systematically by metallographic microscope, and the effect of Mg,Zr alone and compound addition on Ferrite and bainitic phase zone in CCT curve of experimental steel was discussed. The results show that the initial transformation temperature of supercooled Austenite and pearlite can be affected by the addition of Mg,Zr and Mg-Zr. The addition of Mg and Mg-Zr can inhibit the transformation of ferrite and promote the transformation of bainite, and the microstructure dominated by bainite can be obtained in the cooling rate range of 5 鈮，

本文編號：2501785