Precipitation and TRIP enhanced spallation resistance of additive manufactured M350 steel

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2024-11-16 DOI:10.1016/j.msea.2024.147547

Xiaotian Yao , Qiannan Wang , Sen Chen , Yuan Wang , Siyuan Wei , Kwang Boon Lau , Pei Wang , Chengda Dai , Jianbo Hu

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引用次数: 0

Abstract

This work investigates the spall damage and microstructural deformation behaviors of a heat-treated, hierarchical structured 18 wt% Ni-350 maraging steel (M350) produced by laser powder bed fusion (LPBF) under shock loading. The samples were shock-loaded along different orientations with peak shock stresses ranging from 7.0 GPa to 10.5 GPa. Experimental results demonstrate that the M350 exhibits ultra-high spall strength of 5.01–5.89 GPa and 4.53–4.99 GPa when loading perpendicularly and parallel to the building direction, respectively. Spall damage is characterized as a typical transgranular brittle fracture with {100} cleavage planes within the block. The observed superior mechanical performance is attributed to the precipitation strengthening and the transformation-induced plasticity (TRIP) effect. Dislocation slip cuts through the Ni₃Ti precipitates, causing them to fracture, simultaneously, high density precipitates impede dislocation movement according to the Orowan mechanism, preventing the formation of microcracks. The residual austenite undergoes martensitic transformation with the formation of new secondary laths with widths of 20–60 nm to accommodate localized plastic deformations, which creates a large number of grain boundaries and leads to grain refinement.

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沉淀和 TRIP 增强了添加剂制造的 M350 钢的抗剥落性

本研究探讨了激光粉末床熔融（LPBF）生产的热处理分层结构 18 wt% Ni-350 马氏体时效钢（M350）在冲击载荷下的剥落损伤和微结构变形行为。样品沿不同方向受到冲击加载，冲击应力峰值为 7.0 GPa 至 10.5 GPa。实验结果表明，当垂直和平行于建筑方向加载时，M350 表现出超高的剥落强度，分别为 5.01-5.89 GPa 和 4.53-4.99 GPa。剥落破坏的特征是典型的跨晶脆性断裂，块体内部有{100}劈裂面。观察到的优异机械性能归因于沉淀强化和转化诱导塑性（TRIP）效应。位错滑移穿过 Ni3Ti 沉淀，导致其断裂，同时，高密度沉淀根据奥罗恩机制阻碍了位错运动，防止了微裂纹的形成。残余奥氏体发生马氏体转变，形成宽度为 20-60 nm 的新次生板条，以适应局部塑性变形，从而形成大量晶界，导致晶粒细化。

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 Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.