胡锋,王同良,车马俊,崔强,吴开明

• 1:南京钢铁股份有限公司研究院
• 2:武汉科技大学国际钢铁研究院

摘要(Abstract)：

320 mm厚度连铸坯采用控轧-控冷轧制成100 mm钢板,通过淬火-回火热处理制备690 MPa级特厚超高强海工钢,研究了表面和1/4厚度处的回火马氏体对系列低温冲击性能的影响。结果表明:特厚钢板表面奥氏体晶粒均匀细小,回火后获得几乎为全回火马氏体组织,其低温冲击韧性比较低。淬火过程中,过快的冷却速度提高了钢板表面马氏体转变的过冷度,引起马氏体转变的形核率降低,导致特厚板表面马氏体板条束、板条块等亚结构的相对粗大,造成冲击韧性低下,尤其降低-60℃和-80℃低温冲击韧性。

关键词(KeyWords)： 特厚板;冷却速度;形核率;冲击韧性;回火马氏体

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51601134)

作者(Author): 胡锋,王同良,车马俊,崔强,吴开明

DOI: 10.13289/j.issn.1009-6264.2017-0121

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