Additively manufactured Ti-6Al-4V microstructure tailoring for improved fatigue life performance

被引：0
作者：
Beal, Roger [1 ]
Salehi, Seyyed-Danial [1 ]
Kingstedt, Owen T. [1 ]
机构：
[1] Univ Utah, Dept Mech Engn, Salt Lake City, UT 84112 USA
来源：
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2024年 / 47卷 / 07期
关键词：
crack growth rate; fatigue; laser powder bed fusion; Ti-6Al-4V; HIGH-CYCLE FATIGUE; HEAT-TREATMENT; MECHANICAL-PROPERTIES; CRACK-PROPAGATION; INITIATION; STRESS; GROWTH; BEHAVIOR; OXYGEN; NOTCH;
D O I：
10.1111/ffe.14316
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
In this study, laser powder bed fusion (LPBF)-produced Ti-6Al-4V is subjected to three separate post-build heat treatments (HTs), specifically (1) a one-step annealing HT exceeding the beta$$ \beta $$-transus temperature, (2) a two-step annealing HT whose first step exceeds the beta$$ \beta $$-transus temperature and the second step is an anneal below the beta$$ \beta $$-transus temperature, and (3) a sawtooth HT with temperatures oscillating below the beta$$ \beta $$-transus temperature. Tensile properties and fatigue crack growth behavior were assessed and compared to wrought Ti-6Al-4V. LPBF materials nominally exhibited a 17% yield stress reduction, 1.9% strain-to-failure increase, and 9.2% modulus of toughness decrease. Fatigue crack growth curves were used to assess the linear crack growth rate region and approximate fracture toughness (KIC$$ {K}_{IC} $$). Post-mortem fractography observed striations indicating the crack growth direction frequently changes direction providing an understanding of the slower crack growth rates observed in LPBF materials compared to their wrought counterpart. Investigated tensile and fatigue properties of LPBF Ti-6Al-4V subjected to three heat treatments. Exceeding the beta$$ \beta $$-transus temperature provides improved fatigue performance. A one-step 2 h 1020 degrees C heat treatment improved fatigue life to the greatest extent. Crack paths in LPBF material studied frequently divert from the primary crack growth direction.
引用
收藏
页码：2599 / 2615
页数：17
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