X65抗酸管线钢氢致开裂的晶体学表征
张继明，朱延山，邵春娟，曲锦波
（江苏省（沙钢）钢铁研究院，江苏 张家港 215625）
摘 要 采用电子背散射衍射方法（EBSD）对X65MS抗酸管线钢氢致开裂（HIC）的晶体学特征进行了研究，结果表明，{111}//ND取向晶粒和回复、再结晶晶粒具有良好的抗HIC性能，而{101}//ND取向晶粒和变形晶粒具有较高的HIC裂纹敏感性；此外，低值的局部取向错配角（KAM）和大角度晶界（HAGBs）对HIC裂纹萌生和扩展具有抑制作用，而高值的KAM和小角度晶界（LAGBs）则易于HIC裂纹的萌生和扩展。
关键词 抗酸管线钢；氢致开裂；晶体学取向；晶界
中图分类号：TG142；O76；TG115.21+5.3 文献标识码：A doi:10.3969/j.issn.1000-6281.2020.03.006
Crystallographic characterization of hydrogen induced cracking in an X65MS acid-resistant pipeline steel
ZHANG Ji-ming，ZHU Yan-shan，SHAO Chun-juan，QU Jin-bo
(Institute of Research of Iron and Steel, Shasteel，Zhangjiagang Jiangsu 215625, China)
Abstract Crystallographic characterization of hydrogen induced cracking (HIC) in an X65MS acid-resistant pipeline steel was studied by electron backscattered diffraction (EBSD) method. The results show that {111}//ND oriented grains, and recovered and recrystallized grains have excellent HIC resistance, while {101}//ND oriented grains and deformed grains have high HIC cracking sensitivity. In addition, low local Kernel average misorientation (KAM) and high angle grain boundaries (HAGBs) can effectively inhibit the crack propagation of HIC in the X65MS pipeline steel, while the high KAM and LAGBs can easily induce the initiation and propagation of HIC cracks.
Keywords acid-resistant pipeline steel；hydrogen induced cracking；crystallographic orientation；grain boundary
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