本文選題：高強韌抗震建筑鋼 + CCT曲線　； 參考：《武漢科技大學》2016年碩士論文

【摘要】：本文研究了Q550GJ高強韌抗震建筑鋼,采用低碳并添加了適量的Mo、Cr,Ni合金元素和Nb、Ti微合金元素設計,通過TMCP工藝得到貝氏體+鐵素體的雙相組織,獲得高的強度、良好的韌性和較低的屈強比。通過Gleeble-1500熱模擬試驗,力學性能試驗,OM和SEM組織觀察以及CT觀察孔洞萌生生長試驗,得到如下重要結果:Q550GJ的CCT曲線表明,當冷卻速度介于0.1~5℃/S時得到鐵素體、珠光體和貝氏體,當冷卻速度介于5~50℃/S時得到鐵素體,貝氏體和馬氏體,為控軋控冷工藝提供有效的依據(jù)�？乩涔に嚨拈_冷和終冷溫度對試驗鋼組織和屈強比有重要影響:開冷溫度越低,鐵素體量越多,貝氏體量越少,降低強度和屈強比;終冷溫度越低,貝氏體組織細化,M/A島量有所增加,提高強度和屈強比。采用適當?shù)拈_冷溫度和終冷溫度配合工藝,可以獲得高強韌和較低屈強比性能的抗震建筑鋼。CT觀察孔洞萌生生長試驗探明了Q550GJ高強韌建筑鋼的韌性斷裂機制為裂紋和夾雜物導致的單個大孔洞逐步緩慢連接,最后與大量M/A島導致的小孔洞匯合連接而發(fā)的生韌性斷裂。
[Abstract]:In this paper, Q550GJ high strength and toughness aseismic building steel is studied. The design of low carbon and appropriate amount of Mo-Cr-Ni alloy element and Nb-Ti microalloyed element is used. The bainitic ferrite dual phase structure is obtained by TMCP process, and the high strength is obtained. Good toughness and low yield ratio. By means of Gleeble-1500 thermal simulation test, mechanical properties test, OM and SEM microstructure observation and CT observation, the following important results are obtained: 1: Q550GJ CCT curve shows that ferrite, pearlite and bainite can be obtained when cooling rate is between 0.1 鈩，

本文編號：1801019