Fatigue Properties of Ti-6Al-4V Produced by Selective Laser Melting

2018 ◽  
Vol 45 (11) ◽  
pp. 1102012
Author(s):  
马涛 Ma Tao ◽  
刘婷婷 Liu Tingting ◽  
廖文和 Liao Wenhe ◽  
蒋立异 Jiang Liyi ◽  
肖振楠 Xiao Zhennan
Keyword(s):  
Selective Laser Melting ◽  
Fatigue Properties ◽  
Laser Melting

scholarly journals Selective Laser Melting of Aluminum and Its Alloys

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4564 ◽  
Author(s):  
Zhi Wang ◽  
Raghunandan Ummethala ◽  
Neera Singh ◽  
Shengyang Tang ◽  
Challapalli Suryanarayana ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Processing Parameters ◽  
Fatigue Properties ◽  
Internal Stresses ◽  
Surface Oxide Layer ◽  
Alloy Development ◽  
Laser Melting ◽  
Powder Bed ◽  
Microstructure Evaluation ◽  
Melt Cooling

The laser-based powder bed fusion (LBPF) process or commonly known as selective laser melting (SLM) has made significant progress since its inception. Initially, conventional materials like 316L, Ti6Al4V, and IN-718 were fabricated using the SLM process. However, it was inevitable to explore the possible fabrication of the second most popular structural material after Fe-based alloys/steel, the Al-based alloys by SLM. Al-based alloys exhibit some inherent difficulties due to the following factors: the presence of surface oxide layer, solidification cracking during melt cooling, high reflectivity from the surface, high thermal conductivity of the metal, poor flowability of the powder, low melting temperature, etc. Researchers have overcome these difficulties to successfully fabricate the different Al-based alloys by SLM. However, there exists no review dealing with the fabrication of different Al-based alloys by SLM, their fabrication issues, microstructure, and their correlation with properties in detail. Hence, the present review attempts to introduce the SLM process followed by a detailed discussion about the processing parameters that form the core of the alloy development process. This is followed by the current research status on the processing of Al-based alloys and microstructure evaluation (including defects, internal stresses, etc.), which are dealt with on the basis of individual Al-based series. The mechanical properties of these alloys are discussed in detail followed by the other important properties like tribological properties, fatigue properties, etc. Lastly, an outlook is given at the end of this review.

Low-Cycle-Fatigue Properties of a 17-4 PH Stainless Steel Manufactured via Selective Laser Melting

2021 ◽  
Vol 877 ◽  
pp. 55-60
Author(s):  
Lorenzo Maccioni ◽  
Eleonora Rampazzo ◽  
Filippo Nalli ◽  
Yuri Borgianni ◽  
Franco Concli
Keyword(s):  
Stainless Steel ◽  
Selective Laser Melting ◽  
Low Cycle Fatigue ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Laser Melting ◽  
Softening Behavior ◽  
The One ◽  
Cylindrical Samples

In this paper, the static and low-cycle-fatigue (LCF) behavior of wrought samples of 17-4 PH stainless steel (SS) manufactured via Selective Laser Melting (SLM) are presented. On the one hand, several scholars have studied SLM materials and literature reports a huge amount of data as for the high-cycle-fatigue (HCF) behavior. On the other hand, few are the data available on the LCF behavior of those materials. The aim of the present research is to provide reliable data for an as-build 17-4 PH steel manufactured via SLM techniques. Only with quantitative data, indeed, it is possible to exploit all the advantages that this technology can offer. In this regard, both quasi-static (QS) and low-cycle-fatigue tests were performed on Additive Manufacturing (AM) cylindrical samples. Through QS tests, the constitutive low has been defined. Strain-controlled fatigue tests on an electromechanical machine were performed on 12 samples designed according to the ASTM standard. Tests were continued also after the stabilization was reached (needed for the cyclic curve described with the Ramberg-Osgood equation) to obtain also the fatigue (ε-N) curve. Results show that the material has a softening behavior. The Basquin-Coffin-Manson (BCM) parameters were tuned on the basis of the ε-N combinations after rupture.

scholarly journals Influences of Horizontal and Vertical Build Orientations and Post-Fabrication Processes on the Fatigue Behavior of Stainless Steel 316L Produced by Selective Laser Melting

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4203 ◽  
Author(s):  
Paul Wood ◽  
Tomasz Libura ◽  
Zbigniew L. Kowalewski ◽  
Gavin Williams ◽  
Ahmad Serjouei
Keyword(s):  
Stainless Steel ◽  
Selective Laser Melting ◽  
Shot Peening ◽  
Fatigue Behavior ◽  
Fracture Pattern ◽  
Fatigue Properties ◽  
Stainless Steel 316L ◽  
Laser Melting ◽  
Test Pieces ◽  
Laser Systems

In this paper, the influences of build orientation and post-fabrication processes, including stress-relief, machining, and shot-peening, on the fatigue behavior of stainless steel (SS) 316L manufactured using selective laser melting (SLM) are studied. It was found that horizontally-built (XY) and machined (M) test pieces, which had not been previously studied in the literature, in both stress-relieved (SR) or non-stress-relieved (NSR) conditions show superior fatigue behavior compared to vertically-built (ZX) and conventionally-manufactured SS 316L. The XY, M, and SR (XY-M-SR) test pieces displayed fatigue behavior similar to the XY-M-NSR test pieces, implying that SR does not have a considerable effect on the fatigue behavior of XY and M test pieces. ZX-M-SR test pieces, due to their considerably lower ductility, exhibited significantly larger scatter and a lower fatigue strength compared to ZX-M-NSR samples. Shot-peening (SP) displayed a positive effect on improving the fatigue behavior of the ZX-NSR test pieces due to a compressive stress of 58 MPa induced on the surface of the test pieces. Fractography of the tensile and fatigue test pieces revealed a deeper understanding of the relationships between the process parameters, microstructure, and mechanical properties for SS 316L produced by laser systems. For example, fish-eye fracture pattern or spherical stair features were not previously observed or explained for cyclically-loaded SLM-printed parts in the literature. This study provides comprehensive insight into the anisotropy of the static and fatigue properties of SLM-printed parts, as well as the pre- and post-fabrication parameters that can be employed to improve the fatigue behavior of steel alloys manufactured using laser systems.

Fracture fatigue properties of Inconel 718 manufactured with Selective Laser Melting

2019 ◽  
Author(s):  
Frederick Golinveaux ◽  
Kyle Riviera ◽  
Jacob Rome ◽  
Christopher Sagrillo ◽  
Zachary T. Kier ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Inconel 718 ◽  
Fatigue Properties ◽  
Laser Melting
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