Influence of microstructure on fracture feature of Ti6Al4V alloy prepared by 3D printing

Losertová, Monika; Kubeš, V.; Drápala, Jaromír; Dostalova, Kamila; Sevostyanov, M. A.; Cocco, Vittorio Di; Iacoviello, Francesco

doi:10.1088/1757-899x/726/1/012020

Cited by 3 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The size of the dimples was calculated to be about 17 µm, indicating excellent resistance to deformation [25]. The excellent deformation capacity was related to the high 14% β phase in the samples, reported to be beneficial for ductile fracture [26]. However, fracture areas near the steps (marked as II and III) presented totally different morphologies with an obvious shear lip, as shown in Figure 8c,g.…”

Section: Fracture Morphology Of the Tensile Boltmentioning

confidence: 92%

Fracture Mode Transition during Assembly of TC4 High-Lock Bolt under Tensile Load: A Combined Experimental Study and Finite Element Analysis

Feng¹,

Dong²,

Hu³

et al. 2022

Materials

View full text Add to dashboard Cite

Fracture during the assembly process is an important failure mode for high-lock bolts used in the aviation industry, which greatly increases the potential of unpredictable accidents during service. In the current study, the underlying reasons for fracture during the assembly of a TC4 high-lock bolt was investigated using a tensile test and finite element analysis (FEA). The microstructure of the as-received bolt consisted of a high proportion of α phase, some β phase, and a small amount of α′ phase formed via martensite phase transformation during the rammer process. The experimental force–displacement curves revealed an average yield load of 55.9 kN and a breaking load of 67.65 kN. The corresponding yield strength was calculated to be 0.9 GPa, which was smaller than the standard value of TC4. This was attributed to the preload-induced stress concentration on the thread surface, leading to obvious strain hardening, which can lead to crack initiation. The effect of preload was further confirmed by the fractographies in which the initial crack was observed on the thread surface. The fractographies suggested that hybrid fracture occurred on the tensile loaded bolt. The initial failure was brittle fracture on the thread surface, transforming into ductile fracture in the screw. The results can contribute to understanding the effect of preload on the load carry capacity of high-lock bolts and provide a strategy to design its assembly specification.

show abstract

Section: Fracture Morphology Of the Tensile Boltmentioning

confidence: 92%

Fracture Mode Transition during Assembly of TC4 High-Lock Bolt under Tensile Load: A Combined Experimental Study and Finite Element Analysis

Feng¹,

Dong²,

Hu³

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

“…It is possible to achieve a component accuracy of around ± 50 μm, with production speeds ranging from 5-20 cm³/h depending on the size of the machine. The produced parts have a homogeneous structure and almost 100% density, therefore not only the physical but also the mechanical properties of the products match the structure of the castings [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…For Ti6Al4V, the influence of the process parameters as well as the heat treatment on the SLM product properties is deeply studied [2][3][4] and is still of particular interest for biocompatible implants in orthopaedics and traumatology. The SLM process, producing vertically layer by layer, results in the formation of a highly directional microstructure and can lead to certain porosity in the product [1,5,6].…”

Section: Introductionmentioning

confidence: 99%