Fracture Toughness of Ti-6Al-4V and Ti-6Al-4V ELI Alloys Fabricated by Electron Beam Melting With Different Orientation and Positions

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2025-02-24 DOI:10.1111/ffe.14607

Rubén Niñerola, Eugenio Giner

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Abstract

This paper provides an analysis of the change in fracture toughness of Ti-6Al-4V and Ti-6Al-4V ELI alloys caused by electron beam melting process. This additive manufacturing technology shows a characteristic metallographic formation: a columnar grain oriented parallel to the building direction that produces an anisotropic mechanical behavior. We present an evaluation of how the microstructural gradient affects mechanical properties, in different orientations and positions in the bottom zone of the manufacturing region. Fracture toughness was analyzed in four orientations, two parallel and two perpendicular to beta columnar grains. Microstructural and mechanical changes are associated with the thermal gradient in the powder bed which produces a cooling rate gradient. Microstructural characteristics vary with respect to vertical position, decreasing hardness and increasing fracture toughness with height. Crack propagation is strongly influenced by the alpha grain boundary. Chemical analyses have been carried out to determine the level of interstitial elements.

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不同取向和位置电子束熔炼Ti-6Al-4V和Ti-6Al-4V ELI合金的断裂韧性

本文分析了电子束熔化对Ti-6Al-4V和Ti-6Al-4V ELI合金断裂韧性的影响。这种增材制造技术显示出一种特征的金相结构：柱状晶粒平行于建筑方向，产生各向异性的力学行为。我们提出了一个评估如何微观结构梯度影响力学性能，在不同的方向和位置在制造区域的底部区域。分析了β柱状晶粒在平行和垂直4种取向下的断裂韧性。显微组织和力学变化与粉末床中的热梯度有关，热梯度产生冷却速率梯度。显微组织特征随垂直位置而变化，硬度随高度而降低，断裂韧性随高度而增加。裂纹扩展受α晶界的强烈影响。已经进行了化学分析以确定间隙元素的含量。

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

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.