随着油气管道建设的快速发展,高钢级管线钢强度水平有了显著提高,但是获得优良的强韧性匹配显得尤为重要.影响管线钢强韧性能的主要因素在于其内部微观组织特征.综述了国内外管线钢微观组织特征(晶粒尺寸、非金属夹杂物、带状组织)的研究现状,分析了以往工作在管线钢微观组织特征与强韧性能关系研究的局限性.在此基础上,提出了采用电子背散射衍射技术和原位观测技术,研究了有效晶粒尺寸的表征方法及夹杂物和带状组织的微观力学行为的解决方案.并讨论了该方案的越要性和可行性.
The strength property of high grade pipeline steel has been obviously improved with the rapid development of the constructing of oil and gas pipelines. And the excellent strength-toughness match of pipeline steel is very important. The major affecting factor on strength-toughness of pipeline steel is microstructure characteristic. In this paper,the research status of pipeline steel microstructure characteristic including effective particle size,non-metallic inclusion and banded structure is summarized at home and abroad. In addition,the shortcomings of fomer research on the relationship between microstructure characteristic and strength-toughness of this pipeline steel are also analyzed. On this basis,a solution is put forward to investigate the characterization of effective particle size and micromechanical behavior of inclusion and banded structure with the method of electron backscatter diffraction and the method of SEM in situ observation. And the necessities and feasibilities of the solution are discussed.
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