摘要
利用焊接热模拟技术、光学金相、透射电镜和冲击试验等现代测试手段研究了X100高性能管线钢HAZ粗晶区韧性随焊接热输入的变化规律,并提出了高性能管线钢热影响区的韧化方向。结果表明:当热输入分别为10kJ/cm、20kJ/cm、25kJ/cm和50kJ/cm时,与母材相比,其HAZ粗晶区韧性随着焊接热输入不同的值,粗晶区韧性下降的幅度不同,表现为具有不同的热敏感性。其中热输入为10kJ/cm时下降得最少,热输入为50kJ/cm时下降得最多。这是由于前者的晶粒内部形成的贝氏体铁素体板条细长、平直,而后者的组织产生了尺寸较大的准多边形铁素体和退化形态的M-A岛所致。
The variety regulation between the toughness of coarse grained region for XIO0 pipeline steel and welding heat input number were studied by welding thermal simulation technique, optics and TEM as well as impact toughness test. The results show that with different welding heat input number, the toughness at coarse grained region compared to the parent material when the heat input is 10 kJ/cm, 20 kJ/cm, 25 kJ/cm and 50 kJ/cm, showing different decrease and heat susceptibility. Among the it has the largest decline. This is because the slender former, while the latter organization had caused the MA island. heat input at 10 kJ/cm, dropping at least,however, at 50 kJ/cm, and straight Bainitie Ferrite batten, the grains formed inside the larger size of quasi-polygonal Ferrite and degenerative forms of
基金
国家科技支撑计划(2011BAE35B01)
陕西省优势学科专项资金资助项目(ys37020203)
关键词
管线钢
热敏感性
焊接热输入
粗晶区
韧性
pipeline steel, heal susceptibility, welding heat input, coarse grained region, toughness
