石莉,董浩,崔建海,周正

• 1:舞阳钢铁有限责任公司
• 2:重庆大学材料科学与工程学院

摘要(Abstract)：

借助光学显微镜、扫描电镜和冲击试验等研究了淬回火态07MnNiMoDR钢在厚度方向上典型位置的显微组织及低温冲击性能。结果表明：淬回火态07MnNiMoDR钢在厚度方向上显微组织分布不均匀，表面主要由板条贝氏体组成，1/4位置主要以板条贝氏体和粒状贝氏体的混合组织为主，而1/2位置主要为等轴铁素体和粒状贝氏体组成的混合组织，同时还存在大尺寸的M/A岛。表面位置和1/4位置晶粒取向分布均匀，而1/2位置主要以<111>和<001>晶粒取向为主，<110>晶粒取向占比较少；板厚1/2位置存在较强的α纤维织构(<110>//RD),而其他类型的织构组分在厚度方向上分布均匀。板厚1/4位置的冲击吸收能量分布均匀，平均值为291 J,而板厚1/2位置的冲击吸收能量分布不均匀，平均值为198.7 J。板厚1/2位置处大尺寸尖锐的M/A岛和较强的α纤维织构(<110>//RD)是其低温冲击性能不稳定和显著降低的原因。

关键词(KeyWords)： 07MnNiMoDR钢;淬回火;显微组织;低温冲击性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 石莉,董浩,崔建海,周正

DOI: 10.13289/j.issn.1009-6264.2022-0290

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