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AA7010-T7452 开式模锻合金的损伤机制与各向异性：疲劳裂纹扩展

Damage Mechanisms and Anisotropy of an AA7010-T7452 Open-Die Forged Alloy: Fatigue Crack Propagation.

作者信息

Strohmann Tobias, Breitbarth Eric, Besel Michael, Zaunschirm Stefan, Witulski Thomas, Requena Guillermo

机构信息

Institute of Materials Research, German Aerospace Center (DLR), 51147 Cologne, Germany.

Otto Fuchs KG, 58540 Meinerzhagen, Germany.

出版信息

Materials (Basel). 2022 May 25;15(11):3771. doi: 10.3390/ma15113771.

DOI:10.3390/ma15113771
PMID:35683070
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9181149/
Abstract

The process-microstructure-property relationship of high-strength 7000 series aluminum alloys during fatigue crack propagation (FCP) is highly relevant for safety during the design and service of aircraft structural components. It is scientifically evident that many metallurgical factors affect FCP properties, but partly contradictory or inconclusive results show that the quantitative description of the relationships is still a major challenge among researchers and engineers. Most research focuses on sheet or plate products and investigations lack quantitative information on the process-property relationship between open-die forged thick products and FCP. The present study contributes to this field by investigating the fatigue crack growth behavior of an open-die forged AA7010-T7452 aluminum alloy. Four different forging conditions comprising different characteristic microstructures are comparatively analyzed. The influence of grain size, grain shape, specimen orientation, crystallographic texture, and primary phase particles is investigated. Fractographic analysis reveals different active damage mechanisms during fatigue crack growth. Based on that, the microstructure features relevant to fatigue damage areidentified in each regime of crack growth.

摘要

高强度7000系列铝合金在疲劳裂纹扩展（FCP）过程中的工艺 - 微观结构 - 性能关系对于飞机结构部件的设计和服役期间的安全性高度相关。科学上很明显，许多冶金因素会影响FCP性能，但部分相互矛盾或不确定的结果表明，这些关系的定量描述仍然是研究人员和工程师面临的主要挑战。大多数研究集中在薄板或板材产品上，并且对于开式模锻厚产品与FCP之间的工艺 - 性能关系缺乏定量信息。本研究通过研究开式模锻AA7010 - T7452铝合金的疲劳裂纹扩展行为，为该领域做出了贡献。对包含不同特征微观结构的四种不同锻造条件进行了比较分析。研究了晶粒尺寸、晶粒形状、试样取向、晶体织构和初生相颗粒的影响。断口分析揭示了疲劳裂纹扩展过程中不同的活性损伤机制。基于此，在裂纹扩展的每个阶段识别出与疲劳损伤相关的微观结构特征。

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