scholarly journals Effects of Deposition Strategy and Preheating Temperature on Thermo-Mechanical Characteristics of Inconel 718 Super-Alloy Deposited on AISI 1045 Substrate Using a DED Process

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1794
Author(s):  
Ho Kim ◽  
Kwang-Kyu Lee ◽  
Dong-Gyu Ahn ◽  
Hyub Lee
Keyword(s):  
Residual Stress ◽  
Inconel 718 ◽  
Small Volume ◽  
Stress Distributions ◽  
Thermomechanical Characteristics ◽  
Preheating Temperature ◽  
Interpass Time ◽  
Aisi 1045 ◽  
Directed Energy ◽  
Super Alloy

Thermomechanical characteristics are highly dependent on the deposition strategy of the directed energy deposition (DED) process, including the deposition path, the interpass time, the deposition volume, etc., as well as the preheating condition of the substrate. This paper aims to investigate the effects of the deposition strategy and the preheating temperature on thermomechanical characteristics of Inconel 718 super-alloy deposited on an AISI 1045 substrate using a DED process via finite element analyses (FEAs). FE models for different deposition strategies and preheating temperatures are created to examine the thermomechanical behavior. Sixteen deposition strategies are adopted to perform FEAs. The heat sink coefficient is estimated from a comparison of temperature histories of experiments and those of FEAs to obtain appropriate FE models. The influence of deposition strategies on residual stress distributions in the designed model for a small volume deposition is examined to determine feasible deposition strategies. In addition, the effects of the deposition strategy and the preheating temperature on residual stress distributions of the designed part for large volume deposition are investigated to predict a suitable deposition strategy of the DED head and appropriate preheating temperature of the substrate.

Research on Drilling Process of Nickel-Based Super-Alloy

2010 ◽  
Vol 33 ◽  
pp. 373-377
Author(s):  
Jian Wu ◽  
Rong Di Han
Keyword(s):  
Feed Rate ◽  
Empirical Formula ◽  
Inconel 718 ◽  
Thrust Force ◽  
Shear Angle ◽  
Drilling Process ◽  
Deformation Characteristics ◽  
Drilling Speed ◽  
Aisi 1045 ◽  
Super Alloy

Nickel-based super-alloy belongs to difficult-to-machine materials, its machinability is low. To find out the difficulties of drilling nickel-based super-alloy, it is necessary to study the drilling process. The study on the drilling process of nickel-based super-alloy Inconel 718 is discussed from two aspects, drilling deformation and drilling forces distribution. For studying the drilling deformation characteristics and influence laws, the drilling chip specimens are obtained by using self-made drilling quick-stop device. Then, the empirical formula of shear angle is also given. Finally, the drilling forces distribution is studied. Results shows that: drilling deformation decreases when the distance to chisel edge, drilling speed and feed rate increases; drilling deformation of Inconel 718 is larger than AISI 1045; the ratio of torque and thrust force on the lead cutting edge is 29%~33%, 74%~77%, respectively; the torque and thrust force of Inconel 718 is about 1.8~2.3 times than that of AISI 1045.

Microstructure, Hardness, and Residual Stress Distributions in T-Joint Weld of HSLA S500MC Steel

2017 ◽  
Vol 48 (3) ◽  
pp. 1103-1110 ◽  
Author(s):  
Intissar Frih ◽  
Guillaume Montay ◽  
Pierre-Antoine Adragna
Keyword(s):  
Residual Stress ◽  
Stress Distributions

scholarly journals X-ray nanodiffraction analysis of stress oscillations in a W thin film on through-silicon via

2016 ◽  
Vol 49 (1) ◽  
pp. 182-187 ◽  
Author(s):  
J. Todt ◽  
H. Hammer ◽  
B. Sartory ◽  
M. Burghammer ◽  
J. Kraft ◽  
...  
Keyword(s):  
Thin Film ◽  
Residual Stress ◽  
Finite Element ◽  
Diffraction Data ◽  
Element Model ◽  
Stress Distributions ◽  
Through Silicon Via ◽  
X Ray ◽  
Tangential Stresses ◽  
Stress Components

Synchrotron X-ray nanodiffraction is used to analyse residual stress distributions in a 200 nm-thick W film deposited on the scalloped inner wall of a through-silicon via. The diffraction data are evaluated using a novel dedicated methodology which allows the quantification of axial and tangential stress components under the condition that radial stresses are negligible. The results reveal oscillatory axial stresses in the range of ∼445–885 MPa, with a distribution that correlates well with the scallop wavelength and morphology, as well as nearly constant tangential stresses of ∼800 MPa. The discrepancy with larger stress values obtained from a finite-element model, as well as from a blanket W film, is attributed to the morphology and microstructural nature of the W film in the via.

scholarly journals Effect of Process Parameters and High-Temperature Preheating on Residual Stress and Relative Density of Ti6Al4V Processed by Selective Laser Melting

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 930 ◽  
Author(s):  
Martin Malý ◽  
Christian Höller ◽  
Mateusz Skalon ◽  
Benjamin Meier ◽  
Daniel Koutný ◽  
...  
Keyword(s):  
Residual Stress ◽  
High Temperature ◽  
Residual Stresses ◽  
Relative Density ◽  
Selective Laser Melting ◽  
Process Parameters ◽  
Stress Reduction ◽  
Laser Melting ◽  
Preheating Temperature ◽  
Laser Velocity

The aim of this study is to observe the effect of process parameters on residual stresses and relative density of Ti6Al4V samples produced by Selective Laser Melting. The investigated parameters were hatch laser power, hatch laser velocity, border laser velocity, high-temperature preheating and time delay. Residual stresses were evaluated by the bridge curvature method and relative density by the optical method. The effect of the observed process parameters was estimated by the design of experiment and surface response methods. It was found that for an effective residual stress reduction, the high preheating temperature was the most significant parameter. High preheating temperature also increased the relative density but caused changes in the chemical composition of Ti6Al4V unmelted powder. Chemical analysis proved that after one build job with high preheating temperature, oxygen and hydrogen content exceeded the ASTM B348 limits for Grade 5 titanium.

On the Mechanics of Residual Stresses in Girth Welds

2006 ◽  
Vol 129 (3) ◽  
pp. 345-354 ◽  
Author(s):  
P. Dong
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Relative Importance ◽  
Stress Distributions ◽  
Unified Framework ◽  
Joint Geometry ◽  
Weld Residual Stress ◽  
Girth Welds ◽  
Welding Procedure

In this paper, some of the important controlling parameters governing weld residual stress distributions are presented for girth welds in pipe and vessel components, based on a large number of residual stress solutions available to date. The focus is placed upon the understanding of some of the overall characteristics in through-wall residual stress distributions and their generalization for vessel and pipe girth welds. In doing so, a unified framework for prescribing residual stress distributions is outlined for fitness-for-service assessment of vessel and pipe girth welds. The effects of various joint geometry and welding procedure parameters on through thickness residual stress distributions are also demonstrated in the order of their relative importance.

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