Unique fracture behavior and strengthening mechanism of SUS304/45 multilayer steel with network structure

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics Pub Date : 2025-09-22 DOI:10.1016/j.matchemphys.2025.131598

Jiao Wang , Baoxi Liu , Wenxing Yu , Jiale Ding , Boyang Zhang , Fuxing Yin

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Abstract

A new type of SUS304/45 multilayer steel with network structure was designed and fabricated by warm rolling and quenching. The soft SUS304 layers with coarse grains are fragmented into island-chain networks (island fragments refer to the fragmented structure formed by the fracture of the soft phase SUS304 layer after warm rolling, dispersed in the matrix of hard phase 45 steel, constituting the 'island chain' of the network structure.) embedded within the fine-grained hard phase 45 steel matrix. The tensile strength and fracture elongation of 600 °C rolled + quenched (W600-Q) multilayer are 1600 MPa and 14.7 %, respectively, which are significantly higher than those of 1000 °C rolled + quenched (W1000-Q) multilayer. High temperatures alleviate stress concentration near the shear zone, facilitating dislocations slip along the shear direction and promoting their movement and proliferation. The improved properties are attributed to heterogeneous deformation-induced (HDI) stress and the activation of multiple micro shear bands (SBs) in the network structure of the W600-Q sample, which displays distinct ductile shear fracture characteristics. This study provides an experimental foundation and theoretical guidance for developing metallic structural materials with excellent strength-toughness synergy.

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网状结构SUS304/45多层钢独特的断裂行为及强化机理

采用热轧淬火工艺，设计制造了新型网状多层钢SUS304/45。粗晶软质SUS304层破碎成岛链状网络（岛状碎片是指软相SUS304层温轧后断裂形成的碎片状组织，分散在45相硬钢基体中，构成网络结构的“岛链”），嵌入细晶硬45相钢基体中。600℃轧制+淬火（W600-Q）多层材料的抗拉强度和断裂伸长率分别为1600 MPa和14.7%，显著高于1000℃轧制+淬火（W1000-Q）多层材料。高温缓解了剪切带附近的应力集中，有利于位错沿剪切方向滑动，促进位错的移动和扩散。W600-Q试样性能的改善主要是由于非均质变形诱导（HDI）应力和网状结构中多个微剪切带（SBs）的激活，表现出明显的韧性剪切断裂特征。该研究为开发具有优异强韧性协同性能的金属结构材料提供了实验基础和理论指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Chemistry and Physics 工程技术-材料科学：综合

CiteScore

8.70

自引率

4.30%

发文量

1515

审稿时长

69 days

期刊介绍： Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.