Hot deformation induced microstructural evolution in Fe14Cr ODS alloy manufactured by selective laser melting

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL Intermetallics Pub Date : 2025-06-01 Epub Date: 2025-03-13 DOI:10.1016/j.intermet.2025.108736

An Li , Qingchun Chen , Changqing Teng , Jianjun Mao , Xiaoyong Wu , Zhongqiang Fang , Xianggang Kong , Lu Wu , Jun Tang

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Abstract

Hot working, as an important post-treatment process in additive manufacturing (AM), can be used to reduce solidification defects, property anisotropy, grain refinement, and improve the applicability of AM technology. In this work, hot deformation tests were conducted on the preformed Fe14Cr oxide dispersion strengthened (ODS) parts, fabricated by selective laser melting (SLM), on the Gleeble-3800 simulator at temperatures ranging from 850 °C to 1150 °C. The microstructure evolution before and after deformation, the effects of deformation temperature on microstructure, and the stability of nanoparticles were analyzed. The results indicate that friction-induced stress distribution during hot compressive deformation leads to microstructural heterogeneity. The increase of deformation temperature promotes dynamic recrystallization (DRX) and reduces the nonuniform deformation. The relative position of oxide nanoparticles with respect to grain boundaries is primarily determined by grain migration and dissolution precipitation during hot deformation. The pinning effect of solute elements on crystal defects can inhibit dynamic recovery during high-temperature plastic deformation, thereby promoting recrystallization.

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选择性激光熔化制备Fe14Cr ODS合金的热变形诱导组织演变

热加工作为增材制造（AM）中重要的后处理工艺，可以减少凝固缺陷、性能各向异性、细化晶粒，提高增材制造技术的适用性。在Gleeble-3800模拟机上，对采用选择性激光熔化（SLM）法制备的Fe14Cr氧化物弥散强化（ODS）预制件进行了850 ~ 1150℃的热变形试验。分析了变形前后的微观组织演变、变形温度对微观组织的影响以及纳米颗粒的稳定性。结果表明，热压缩变形过程中摩擦引起的应力分布导致微观组织不均匀。变形温度的升高促进了动态再结晶（DRX），减少了不均匀变形。氧化物纳米颗粒相对于晶界的相对位置主要由热变形过程中的晶粒迁移和溶解析出决定。溶质元素对晶体缺陷的钉住作用可以抑制高温塑性变形过程中的动态恢复，从而促进再结晶。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.