黄曼丽,李志超,武会宾,宁博,刘金旭

• 1:北京科技大学钢铁共性技术协同创新中心

摘要(Abstract)：

首先采用"正火轧制"和"热轧+正火"工艺对Q460低合金高强钢进行了处理,随后利用扫描电镜(SEM)和电子背散射衍射(EBSD)技术对试验钢经不同工艺处理后不同层面的显微组织和微观取向进行了研究。结果表明:典型层面微观组织及织构的不同造成了两种工艺下Q460钢强韧性的差异。试验钢经两种工艺处理后的显微组织均为"铁素体+珠光体"的混合组织,但相比正火钢板,正火轧制钢板的1/4厚度处的珠光体片层间距明显较大,虽然两个样品的珠光体含量相当,但由于正火轧制钢板内储存了较多的畸变、位错等缺陷,导致正火轧制钢板的拉伸性能略高。正火轧制试样1/4和1/2厚度处的平均有效晶粒尺寸分别为7.43和9.18μm、正火试样1/4和1/2厚度处的平均有效晶粒尺寸分别为6.08和6.24μm,晶粒尺寸的不同是试样冲击性能差异的一个原因,织构类型及含量则是冲击性能差异的另一个原因。

关键词(KeyWords)： Q460低合金高强钢;强韧性;微观组织;微观取向

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51774033)

作者(Author): 黄曼丽,李志超,武会宾,宁博,刘金旭

DOI: 10.13289/j.issn.1009-6264.2021-0263

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