徐莽,蔡晓辉,弓俊杰,周国平,刘振宇

• 1:东北大学轧制技术及连轧自动化国家重点实验室
• 2:河北钢铁股份有限公司唐山分公司

摘要(Abstract)：

以TMCP(Thermo Mechanical Control Process)实验获得的低成本热轧FB(Ferrite/Bainite)钢为研究对象,通过扩孔实验评价FB钢板的延伸凸缘性能,分析显微组织对延伸凸缘性能的影响,并对扩孔过程中FB钢的裂纹扩展行为进行探讨。结果表明:当贝氏体体积分数在19~25%时,热轧FB钢的抗拉强度不低于551 MPa、扩孔率不小于77%,力学性能和延伸凸缘性能综合起来比较良好;裂纹通过孔洞和微裂纹相互扩展、连接的方式进行;当裂纹扩展到硬相的贝氏体时,裂纹沿着铁素体和贝氏体的相界面绕过贝氏体,并切断铁素体继续扩展。

关键词(KeyWords)： 铁素体/贝氏体双相钢;延伸凸缘性;裂纹;扩孔

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年基金(51104044)

作者(Author): 徐莽,蔡晓辉,弓俊杰,周国平,刘振宇

DOI: 10.13289/j.issn.1009-6264.2016.11.018

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