采用焊接热模拟方法,研究了不同的焊接热循环参数 T_(max)和 t(max/8)对 Ti、Nb 和 N 复合加入的两种成分系列的微合金钢粗晶区奥氏体晶粒尺寸长大的影响。结果表明:奥氏体晶粒尺寸随 T_(max)增大而增大;并且 T_(max)恒定时,随着时间延长,长大倾向不同,含 Ti 低的 Ti-Nb-N 钢(BB503)长大倾向严重。t_(max/8)增大时,两种成分系列钢奥氏体晶粒尺寸变化平缓,但含 Ti 低的 Ti-N 钢(1~#)和 Ti-Nb-N 钢(4~#、BB503)奥氏体晶粒尺寸粗化显著。 The welding thermal simulation method was used to study the effects of different welding thermal cycle parameters (T max and t max / 8) on the austenite grain coarsening grain size of two microalloyed steels with the addition of Ti, Nb and N Effect of size growth. The results show that the grain size of austenite increases with the increase of T max, and with the increase of T max, the growth tendency of Ti-Nb-N steel with low Ti content (BB503 Growing tendency is serious. When t_ (max / 8) increases, the austenite grain sizes of the two component series steel change gently, but Ti-N steels with low Ti contents (1 ~ #) and Ti-Nb- BB503) austenite grain size coarsening significantly.