对系列X80管线钢研究表明,该材料组织特征为含有粒状贝氏体的针状铁素体;粒状贝氏体越细小弥散,其强韧性匹配越好。粒状贝氏体中,M-A岛的作用为阻碍裂纹的扩展;晶粒边界和M-A岛边界易萌生裂纹源。管线钢的有效晶粒决定了材料的塑韧性。具体表现为,当有效晶粒减小时,材料韧脆转变温度降低,断面收缩率提高。随着慢拉伸速率的提高,材料的断裂方式将发生改变。当拉伸速率为0.1 mm/s时,管线钢的延性最佳,而对强度的影响不大。这说明在管线钢富气服役状态下,富气压力有一个最佳值。拉伸速率升高后,断裂逐渐向脆性方式转变。
Study on series X80 pipeline steels shows that microstructure of the steels is characteristic of accicular ferrite containing grannular bainite; the finer size of grannular bainite is, the better the strength and toughness of the steel are. In grannular bainite, the effect of M-A island is to hinder growth of crack,and the grain boundary and island boundary is favourable for formation of crack. Ductility and toughness of pipeline steels depends on the effective grain size. Ductile-brittle transition temperature decreases with decreasing the effective grain size too, but reduction of area increases. With the increase of slow tension rate, the fracture mode is changed. When the tension rate is 0. 1 mm/s, the steels exhibit best tensility and strength of the steels keeps un-changed. Increasing the tension rate, the fracture mode is changed to the brittle.
参考文献
| [1] | 李鹤林.油气输送钢管的发展动向与展望[A].陕西西安,2004 |
| [2] | 冯耀荣,马秋荣.油气管道失效模式与性能要求的探讨[C].压力管道技术研究进展精选集（第三届全国管道技术学术会议：论文专辑）,2006:287-292. |
| [3] | 高惠临.管线钢组织、性能、焊接行为[M].西安:陕西科学技术出版社,1995:89-96. |
| [4] | Smith Y E;Coldren A P;Cryderman R L.Toward Improved Ductility and Toughness[M].Japan:Climax Molybdenum Development Co.Ltd,1972:119-120. |
| [5] | Diaz-fnentes M;Iza-mendia A;Gutierrez I .Analysis of different acicular ferrite microstructures in low-carbon steels by electron backscattered diffraction.Study of their toughness behavior[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2003,34:1043-1067. |
| [6] | 李红英,魏冬冬,林武,曾翠婷,宾杰.X80管线钢冲击韧性研究[J].材料热处理学报,2010(11):73-78. |
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