采用拉伸试验机、冲击试验机、扫描电镜、激光共聚焦显微镜、透射电镜等研究了0．8设计系数 X80管线钢在不同卷取温度下的力学性能和显微组织.结果表明：试验钢的显微组织都以针状铁素体为主,随着卷取温度的升高,M/A 岛体积分数逐渐降低,针状铁素体含量逐渐增多,板条贝氏体逐渐消失；当卷取温度达到480℃时,准多边形铁素体的比例逐渐增大,且晶粒尺寸逐渐增大；钢中析出相受卷取温度的影响较小,均为典型的(Nb,Ti)(C,N)复合型析出粒子；随着卷取温度的升高,试验钢的屈服强度和伸长率先升后降,而抗拉强度呈下降趋势,卷取温度对试验钢低温冲击韧性的影响较小,370℃卷取后试验钢的显微组织和力学性能较佳.
The mechanical properties and microstructures of X80 pipeline steels with a design factor of 0.8 produced at different coiling temperatures were investigated by means of tensile test,impact test,scanning electron microscopy,laser scanning confocal microscopy and transmission electron microscopy.The results show that the microstructures of experimental steels mainly consisted of acicular ferrite.With the increase of the coiling temperature,the volume fraction of M/A islands decreased,the acicular ferrite content increased and lath bainite disappeared gradually.When the coiling temperature increased to 480 ℃,the quasi-polygonal ferrite percentage increased and the grain size enlarged gradually.The influence of the coiling temperature on precipitate phase was little,and the precipitates were composed of typical (Nb,Ti)(C,N)composite grains.With the increase of the coiling temperature,the yield strength and percentage elongation of the experimental steel first increased then decreased,while the tensile strength showed a decreasing trend.The influence of the coiling temperature on the low temperature impact toughness was little.And the optimized microstructures and mechanical properties of the experimental were obtained after coiling at 370 ℃.
参考文献
| [1] | 李鹤林;吉玲康;田伟.高钢级钢管和高压输送：我国油气输送管道的重大技术进步[J].中国工程科学,2010(5):84-90. |
| [2] | 向波;谌贵宇;向熠星;陈静.西三线一级地区设计系数的选择[J].天然气与石油,2011(5):1-5. |
| [3] | 赵新伟;罗金恒;张广利;吉玲康;李洋;吴宏;张对红;郭志梅.0.8设计系数下天然气管道用焊管关键性能指标[J].油气储运,2013(4):355-359. |
| [4] | 郑磊;高珊.高韧性针状铁素体X80级管线钢的试制[J].焊管,2005(2):21-24. |
| [5] | 周晓光;刘振宇;吴迪;王国栋.超快速冷却终止温度对X80管线钢组织和性能的影响[J].机械工程材料,2012(10):5-7,100. |
| [6] | 张国柱;宋志超;张红梅;董楠楠.卷取温度对X80管线钢组织和性能的影响[J].机械工程材料,2010(2):25-26,70. |
| [7] | 仝珂;庄传晶;刘强;韩新利;朱丽霞;何小东.高钢级管线钢中M/A岛的微观特征及其对力学性能的影响[J].机械工程材料,2011(2):4-7. |
| [8] | 张小立;冯耀荣;赵文轸;霍春勇.高钢级管线钢显微组织的演变[J].特殊钢,2008(2):41-43. |
| [9] | 王春明;吴杏芳;刘玠;黄国建;李桂艳.X70管线钢控轧控冷工艺与组织性能的关系[J].钢铁,2005(3):70-74. |
| [10] | 方圆;刘雅政;周乐育;宋仁伯;黄全伟.马氏体体积分数对热轧双相钢形变位错结构和断裂的影响[J].钢铁,2009(8):89-92. |
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