微观组织对管线管氢致开裂的影响

Influence of Microstructures on Hydrogen-induced Cracking of Line Pipe

氢致开裂(HIC)是管线管在含有硫化氢环境下服役的主要失效形式之一。对相同钢级不同工艺和组织的管线管进行HIC试验,研究微观组织对管线管氢致开裂的影响。分析结果表明:铁素体+珠光体组织由于其硬脆的珠光体带的存在,易产生HIC裂纹;而控轧控冷(TMCP)及调质热处理(QT)工艺下的微观组织更加均一,不易产生HIC裂纹。

Hydrogen-Induced Cracking （HIC） is one of the main failure ways for the line pipes used in the H2S envi- ronment. The influence of microstructures on hydrogen-induced cracking of line pipe is researched according to the HIC tests of the same grade line pipes by different process and having different structure. The analyzed results show that the microstructure of ferrite ＋ pearlite has less HIC resistance because of the hard and brittle pearlite bands, and the microstructures obtained by Thermo Mechanical Control Process （TMCP） and Quenching and Tempering （QT） have high HIC resistance because of more homogeneous microstructure.