论文部分内容阅读
本文通过Ｂａｔｔｅｌｌｅ焊道下开裂试验、ＵＴ氢敏感性试验和插销试验对４种含Ｃｕ结构钢的氢致开裂敏感性作出评价。测得的氢致开裂敏感性顺序为：ＨＳＬＡ－８０Ｍ＞ＨＳＬＡ－８Ｏ－２＞ＨＳＬＡ－８Ｏ－１＞ＤＱ－８０，即随着碳当量降低，氢致开裂敏感性也随之降低。与相同强度级别的传统淬火—回火钢相比，含Ｃｕ结构钢具有较好的防止氢致开裂的性能，可以在室温（ＤＱ－８０）或较低的预热温度下（其它三种钢）进行焊接。根据插销试验的实测数据对下临界应力（ＬＣＳ）的６种计算公式进行验证，发现所有公式的计算值普遍偏低。这是由于存在于含Ｃｕ结构钢粗晶热影响区的奥氏体“袋”具有扩散氢“贮室”及裂纹扩展“屏障”的作用，因而在相同的Ｐ＿ｃｍ情况下，含Ｃｕ结构钢比传统钢种具有更高的ＬＣＳ值。
In this paper, the hydrogen cracking resistance of four Cu-containing structural steels was evaluated by Battelle weld bead cracking test, UT hydrogen sensitivity test and bolt test. The sensitivity of hydrogen induced dehiscence was HSLA-80M> HSLA-8O-2> HSA-8O-1> DQ-80, that is, the hydrogen induced dehiscence sensitivity decreased with the decrease of carbon equivalent. Compared with conventional quenched-tempered steels of the same strength level, Cu-containing structural steels have better properties of preventing hydrogen cracking and can operate at room temperature (DQ-80) or at lower preheat temperatures (the other three steels ) For welding. Six kinds of calculation formulas of lower critical stress (LCS) are validated according to the measured data of plug test, and the calculated values of all the formulas are generally low. This is because the austenite “bag” existing in the coarse heat-affected zone of Cu-containing structural steel has the function of diffusion hydrogen “storage chamber” and crack propagation “barrier”. Therefore, under the same P_cm condition, Traditional steels have higher LCS values.