研究了仿晶界型铁素体/粒状贝氏体复相钢轧态组织的韧性与裂纹扩展特点.与单一粒状贝氏体组织相比,仿晶界型铁素体/粒状贝氏体复相组织具有更好的强韧性配合.适量仿品界型铁素体的存在增加了复相组织的协调变形能力.提高了裂纹形成功:同时使裂纹扩展路径弯曲、分叉,微裂纹尖端钝化.在一定程度上提高了裂纹扩展功.在粒状贝氏体转变的第二阶段(富碳亚稳奥氏体→马氏体/奥氏体(M/A岛)缓冷,已转变的马氏体将进行自回火,并提高残余奥氏体的热稳定性,从而使复相组织的裂纹扩展功得到明显提高.
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