發(fā)布時(shí)間：2018-05-03 13:56

  本文選題：微合金鋼 + 回溫軋制��； 參考：《材料工程》2015年11期

【摘要】：采用GLEEBLE 3800熱模擬機(jī)進(jìn)行回溫變形熱壓縮實(shí)驗(yàn),研究回溫溫度對微合金鋼組織轉(zhuǎn)變和鐵素體動態(tài)再結(jié)晶行為的影響。利用金相顯微鏡、掃描電鏡、透射電鏡和背散射電子衍射觀察實(shí)驗(yàn)鋼的微觀組織和晶粒取向,并對形變時(shí)的應(yīng)力-應(yīng)變曲線進(jìn)行分析。結(jié)果表明:實(shí)驗(yàn)鋼回溫變形可獲得超細(xì)晶組織,晶粒平均等效直徑約2μm;在回溫過程中變形發(fā)生動態(tài)回復(fù)形成亞晶組織,峰值溫度變形發(fā)生鐵素體動態(tài)再結(jié)晶形成超細(xì)晶粒;動態(tài)再結(jié)晶機(jī)制包括晶界遷移和亞晶的轉(zhuǎn)動生長,回溫到700℃和750℃時(shí)以前者為主,再結(jié)晶不充分,保留了條帶狀變形鐵素體,800℃變形時(shí),兩者共同作用,形成均勻的等軸狀超細(xì)晶組織;通過線性回歸計(jì)算得到實(shí)驗(yàn)鋼峰值溫度變形時(shí)鐵素體動態(tài)再結(jié)晶激活能Qd=250.18kJ/mol。
[Abstract]:The effect of temperature on microstructure transformation and dynamic recrystallization behavior of ferrite in microalloyed steel was studied by using GLEEBLE 3800 thermal simulator. The microstructure and grain orientation of the experimental steel were observed by metallographic microscope, scanning electron microscope, transmission electron microscope and backscatter electron diffraction, and the stress-strain curves during deformation were analyzed. The results show that the ultrafine grain structure can be obtained by reheating deformation of experimental steel, the average equivalent diameter of grain is about 2 渭 m, and the subcrystalline structure is formed by dynamic recovery during deformation and dynamic recrystallization of ferrite to form ultrafine grain during peak temperature deformation. The mechanism of dynamic recrystallization includes grain boundary migration and subcrystal rotation growth. The former is dominant at 700 鈩，

本文編號：1838747