开发高强度并具有良好抗硫化氢应力腐蚀开裂（sulfide stress cracking，SSC）性能的管线钢是当前管线钢研究的热点. 本文研究了四种不同硫含量（5，17，50，100ppm）管线钢的机械性能和抗硫化氢开裂性能，同时研究了组织（针状铁素体，多边形铁素体＋珠光体）对以上两种性能的影响. 结果表明：高硫（≥100ppm）将导致II型MnS夹杂物的形成，恶化冲击性能，而对拉伸性能和抗硫化氢开裂性能并不产生影响. 此外，粗化的碳氮化合物、夹杂物以及珠光体组织等是潜在的氢陷阱，但并不是决定管线钢抗硫化氢开裂性能的主要因素；针状铁素体组织中的高密度位错，特别是高密度可动位错，是氢的载体和主要运输途径，因此决定了这类管线钢具有较低的抗硫化氢开裂性能，而多边形铁素体＋珠光体组织的管线钢具有相对较高的抗硫化氢开裂性能.
Developing high strength pipeline steels with good sulfide stress cracking (SSC) resistance is a hot topic of pipeline research. In this paper, the role of sulfur content on mechanical properties and SSC resistance of four pipeline steels, with different sulfur contents, i.e. 5, 17, 50,100 ppm respectively, was investigated; and the role of microstructure on these properties was discussed as well. The results showed that high sulfur content, more than 100 ppm, led to the formation of II type MnS inclusion and worsened fracture toughness, but it did not have bad influence on tensile properties and SSC resistance. Furthermore, coarsen carbonnitride, inclusion and even pearlite are potential hydrogen traps, but these are not the most important factors that influence SSC resistance of pipeline steel. Dislocations, especially motional dislocations without pinning effects of finely dispersed precipitates in acicular ferrite are hydrogen carrier and mainly transportation means of hydrogen, which results in the relatively poor SSC resistance of acicular ferrite microstructure.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] |
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