發(fā)布時間：2018-05-08 19:20

  本文選題：超快冷 + X管線鋼　； 參考：《東北大學學報(自然科學版)》2015年11期

【摘要】：研究了14.2 mm X70管線鋼軋后經(jīng)超快冷+層流冷卻、層流冷卻兩種冷卻制度后的顯微組織及力學性能,討論了超快冷+層流冷卻下實驗鋼強韌化機制.結果表明:兩種冷卻制度下實驗鋼力學性能均滿足API SPEC 5L X70要求,超快冷+層流冷卻下實驗鋼強度、塑性及韌性較高,綜合力學性能良好;不同冷卻制度下顯微組織均為貝氏體鐵素體+針狀鐵素體+M-A島混合組織,其中超快冷+層流冷卻下針狀鐵素體、M-A島組織更加細化;超快冷+層流冷卻下實驗鋼主要強韌化機制為細晶強化與納米析出強化;實驗鋼理想軋后冷卻工藝為:820~840℃終軋+超快冷至450~500℃+層流冷卻至350~400℃+卷取.
[Abstract]:The microstructure and mechanical properties of 14.2 mm X70 pipeline steel after ultra-fast laminar cooling and laminar cooling were studied. The strengthening and toughening mechanism of experimental steel under ultra-fast laminar cooling was discussed. The results show that the mechanical properties of the experimental steels under two cooling systems meet the requirements of API SPEC 5L X70, and the strength, ductility and toughness of the experimental steels under ultra-fast laminar cooling are high, and the comprehensive mechanical properties are good. The microstructure of M-A island is mixed with bainitic ferrite acicular ferrite under different cooling conditions, and the microstructure of acicular ferrite M-A island is more fine under ultra-fast laminar cooling. The main strengthening and toughening mechanisms of the experimental steel under ultra-fast laminar cooling are fine grain strengthening and nano-precipitation strengthening, and the ideal cooling process for experimental steel after rolling is as follows: final rolling at 820 ~ 840 鈩，

本文編號：1862717