从晶体学角度看镍含量对 1000 兆帕级高强度低合金钢韧性-脆性转变温度影响的新见解

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
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引用次数: 0

摘要

研究了镍含量(0.92、1.94 和 2.94 wt%)对 1000 兆帕级高强度低合金(HSLA)钢的韧性-脆性转变温度(DBTT)和显微组织的明显影响。利用扫描电子显微镜(SEM)、电子反向散射衍射(EBSD)、透射电子显微镜(TEM)、夏比冲击试验和低温拉伸试验研究了镍含量对韧性影响的根本原因。结果表明,增加镍含量可降低 HSLA 钢的 DBTT,提高低温冲击韧性。EBSD 数据后处理分析表明,低温韧性提高的关键原因是微观结晶结构的细化,特别是块和包的边界密度显著增加。随着镍含量的增加,相邻两个{110}晶面之间取向差大于5°的晶界密度更高,这可以形成更高密度的位错堆积群,从而更好地降低局部应力集中。同时,随着镍含量的增加,堆积断层能(SFE)也随之增加,这使得螺位错在低温下更容易发生交叉滑移,从而导致低温塑性增加。这些观察到的现象和原因为镍含量在降低 DBTT 和提高重型钢板芯部韧性方面的作用提供了理论解释。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
New insights from crystallography into the effect of Ni content on ductile-brittle transition temperature of 1000 MPa grade high-strength low-alloy steel

The significant effect of Ni content (0.92, 1.94 and 2.94 wt%) on ductile-brittle transition temperature (DBTT) and microstructure in a 1000 MPa grade high-strength low-alloy (HSLA) steel was studied. Using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), Charpy impact test and low-temperature tensile test to study the fundamental reasons for the effect of Ni content on toughness. The results indicated that increasing the Ni content can reduce the DBTT of HSLA steel and improve the impact toughness at low temperatures. EBSD data post-processing analysis revealed that the key reason for the increase in low-temperature toughness is the refinement of the microstructural crystallographic structure, specifically the significant increase in the boundary density of the block and packet. With the increase of Ni content, the density of grain boundary with an orientation difference greater than 5° between two adjacent {110} crystal planes was higher, which can form a higher density of dislocation pile-up group, thus better reducing local stress concentration. Meanwhile, the stacking fault energy (SFE) increases with the increase of Ni content, which made the screw dislocation more prone to cross slip at low temperature, resulting in an increase in plasticity at low temperatures. These observed phenomena and reasons provided a theoretical explanation for the role of Ni content in reducing DBTT and enhancing the toughness of the core in heavy gauge plates.

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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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