采用Gleeble 3800热力模拟机对超级双相不锈钢SAF2507焊接热影响区组织进行模拟,研究了不同热输入条件下焊接热影响区显微组织和合金元素含量的变化,通过电化学循环伏安法评价了该组织的耐蚀性.研究结果表明,热输入由0.807 kJ/mm增加至2.552 kJ/mm时,模拟热影响区上奥氏体以晶内奥氏体、晶界奥氏体和魏氏奥氏体3种形貌析出,含量由40％增加到52％.各个热输入时奥氏体的PRE值均大于铁索体的PRE值,因此奥氏体含量的增加使热影响区组织的点蚀电位从1030 mV提高至1082 mV.但是继续增加热输入至2.965 kJ/mm时,在两相交界处观察到有粒状的x相析出.虽然该组织上奥氏体含量仍有增加,但是x相的析出却导致组织的点蚀电位降至1065 mV.
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