电弧焊接超高强度钢板中微针强化引起的纳米晶粒细化

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Naoki Yamaguchi , Takeshi Nishiyama , Tsuyoshi Shiozaki , Yoshikiyo Tamai , Yuji Ichikawa , Kazuhiro Ogawa
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引用次数: 0

摘要

一般来说,无论基体金属的强度如何,超高强度钢(UHSS)和高强度钢(HSS)电弧焊接接头的疲劳强度都相当。不过,微针强化(MNP)方法可以将疲劳强度提高到贱金属的水平。为了了解这种改善的机理,本文研究了经 MNP 处理的超高强度钢(拉伸应力等级为 980 兆帕)电弧焊接接头的微观结构,并将其与高速钢(拉伸应力等级为 440 兆帕)接头进行了比较。我们的重点是在 MNP 处理后的 UHSS 接头中观察到纳米丝的存在,其最小厚度为 4.7 nm。重要的是,即使在循环加载条件下(标称应力 σn = 600 兆帕,N = 3 × 106 个循环),这些纳米丝也表现出了显著的稳定性。这表明纳米丝有助于显著提高 MNP 的疲劳强度。然而,在高速钢接头中没有观察到纳米细丝,这表明发生纳米细丝需要足够的驱动应力。孪晶过程中晶界的位错堆积应力是通过孪晶厚度估算的,为 8.1 GPa。该值与根据霍尔-佩奇系数估算的铁素体钢的 3.7 GPa 处于同一数量级。较低的 C、Si 和 Mn 含量有助于降低堆积应力,从而导致在 440 兆帕的接头中没有纳米孪晶。总之,本研究提供了有关 MNP 处理引起的微观结构变化及其对疲劳强度影响的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Nanotwinning grain refinement induced by micro-needle peening in arc-welded ultra-high strength steel sheet

Nanotwinning grain refinement induced by micro-needle peening in arc-welded ultra-high strength steel sheet

Generally, the fatigue strength of ultra-high strength steel (UHSS) and high strength steel (HSS) arc-welded joints are comparable regardless of base metal's strength. Still, the micro-needle peening (MNP) method can improve the fatigue strength to the level of those of base metals. To understand the mechanism of this improvement, this paper investigates the microstructure of UHSS (tensile stress grade of 980 MPa) arc-welded joints treated with MNP and compares it to HSS (tensile stress grade of 440 MPa) joints. We focus on the presence of nanotwins, which exhibited a minimum thickness of 4.7 nm, observed in the UHSS joints following the MNP treatment. Importantly, these nanotwins demonstrated remarkable stability even under cyclic loading conditions (nominal stress σn = 600 MPa, N = 3 × 106 cycles). This indicates that the nanotwins contribute to the significant improvement in fatigue strength demonstrated by MNP. However, the nanotwins were not observed in the HSS joints, suggesting sufficient driving stress is necessary for their occurrence. The dislocation pileup stress at the grain boundary during twinning was estimated by the thickness of the twin, which was 8.1 GPa. This value is of the same order of magnitude as the 3.7 GPa estimated by the Hall-Petch coefficient for ferritic steel. The lower levels of C, Si, and Mn can contribute to the lower pileup stress, resulting in absence of the nanotwins in the 440 MPa joint. Overall, this study provides insights into the microstructural changes induced by MNP treatment and their impact on the fatigue strength.

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来源期刊
Materialia
Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.40
自引率
2.90%
发文量
345
审稿时长
36 days
期刊介绍: Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).
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