姚连登,赵四新,赵小婷,李红斌

• 1:宝钢技术中心
• 2:上海交通大学材料科学与工程学院

摘要(Abstract)：

采用低碳微合金成分体系和直接淬火工艺,研制了屈服强度超过800MPa,抗拉强度超过950MPa,-40℃冲击功超过90J且焊接裂纹敏感性指数Pcm小于0.2%的40mm低焊接裂纹敏感性厚板。厚板的微观组织为厚度小于1μm贝氏体铁素体板条和沿板条界面分布的M/A组元,贝氏体板条内部有亚板条。随着终冷温度的降低,贝氏体铁素体板条变细。不同终冷温度钢板的贝氏体板条内部均存在高密度位错。试验用钢的贝氏体形核长大过程可以用扩散机制较好的解释。

关键词(KeyWords)： 低焊接裂纹敏感性;高强钢;贝氏体铁素体;扩散

Abstract:

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基金项目(Foundation):

作者(Author): 姚连登,赵四新,赵小婷,李红斌

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