刘美艳,马龙腾,王彦锋,杨永达,马长文,韩承良

• 1:首钢集团有限公司技术研究院
• 2:绿色可循环钢铁流程北京市重点实验室
• 3:首钢京唐钢铁联合有限责任公司

摘要(Abstract)：

利用光学显微镜、扫描电镜、电子探针、透射电镜等研究了少量Mo添加对460 MPa级焊接结构钢组织性能的影响。结果表明:采用相同轧制与冷却工艺时,添加0.18 mass%的Mo后试验钢的强度提升、屈强比下降、塑韧性小幅降低;Mo在钢中未发生明显偏聚,通过固溶强化提高试验钢的淬透性,有利于在控轧控冷工艺条件下使试验钢获得高比例的针状铁素体组织,组织内部具有较高的位错密度,而未添加Mo的试验钢组织以多边形铁素体为主,位错线分布稀疏;Mo添加后造成试验钢组织中大角度晶界比例由38%降至22%,受载时更易发生裂纹扩展,小幅降低试验钢的冲击韧性;Mo部分进入含Nb析出相中,并改变其团簇状分布形态,使析出物颗粒更加弥散,平均尺寸由212 nm降至62 nm,析出强化增量达到无Mo钢的1.5倍以上。

关键词(KeyWords)： 针状铁素体;析出相;大角度晶界;Mo;强韧性

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 刘美艳,马龙腾,王彦锋,杨永达,马长文,韩承良

DOI: 10.13289/j.issn.1009-6264.2021-0068

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