李斯博,万响亮,董志超,胡锋,周松波,杨叠,李光强,吴开明

• 1:武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室
• 2:武汉科技大学省部共建耐火材料与冶金国家重点实验室
• 3:材谷金带(佛山)金属复合材料有限公司
• 4:曹妃甸新天液化天然气有限公司

摘要(Abstract)：

研究了超高强度海工钢在不同线能量的模拟焊接条件下粗晶热影响区的组织演变和冲击韧性，并结合超高温激光扫描共聚焦显微镜原位观察模拟焊接热循环过程中奥氏体晶粒长大及贝氏体转变行为。结果表明：随着线能量的逐步增大，高温阶段停留时间变长使得粗晶热影响区原奥氏体晶粒粗大，中温阶段冷却速度下降促使粗晶热影响区贝氏体转变时变体选择减少，导致大角度晶界减少和对裂纹扩展的阻碍能力减弱，最终低温冲击韧性呈现下降趋势，断裂特征由韧性断裂转变为解理断裂。

关键词(KeyWords)： 超高强度钢;热影响区;线能量;贝氏体转变;低温韧性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(U20A20277,U20A20279)

作者(Author): 李斯博,万响亮,董志超,胡锋,周松波,杨叠,李光强,吴开明

DOI: 10.13289/j.issn.1009-6264.2022-0598

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