Very High Cycle Fatigue Investigations on the Fatigue Strength of Additive Manufactured and Conventionally Wrought Inconel 718 at 873 K

Schmiedel, Alexander; Burkhardt, Christina; Henkel, Sebastian; Weidner, Anja; Biermann, Horst

doi:10.3390/met11111682

Cited by 11 publications

(2 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is an important result showing that the material is much more "defect tolerant" at high temperature. 24 Concerning the fatigue response of T2 samples (Figure 9B), the Basquin curves remain almost parallel and the increase in testing temperature induces a decrease in fatigue limit by $ 15%. 25 All the fracture surfaces were systematically analyzed.…”

Section: Fatigue Behaviormentioning

confidence: 89%

Role of defects and microstructure on the fatigue durability of Inconel 718 obtained by additive layer manufacturing route

Sanchez‐Camargo,

Nadot,

Cormier

et al. 2023

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

A Laser Powder Bed Fusion Inconel 718 produced with intentionally non‐optimized parameters is investigated to understand the role of defects and microstructure on the high‐cycle fatigue life. Samples from three built directions and three heat treatments were used for fatigue tests at room and 650°C under . Printing orientation has a minor effect on fatigue life at both temperatures. Most samples failed from lack of fusion defects, carefully analyzed by scanning electron microscope (SEM) observations. Surface defect leads to transgranular fracture surface, while subsurface initiation leads to crystallographic fracture surface. curves related to hot isostatic pressure condition shown that defects have higher influence at than at 650°C. Kitagawa diagrams are plotted for both temperatures to quantify the influence of defect size on fatigue limit. Natural cracks are observed at the surface in order to discuss the relative part of initiation life in the whole fatigue life.

show abstract

Section: Fatigue Behaviormentioning

confidence: 89%

Role of defects and microstructure on the fatigue durability of Inconel 718 obtained by additive layer manufacturing route

Sanchez‐Camargo,

Nadot,

Cormier

et al. 2023

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Moreover, internal defects were identified as the cause of cracks in these specimens, distinguishing them from the more resilient wrought counterparts. 13 Analysing the microstructure of Inconel 718 samples produced through the selective laser melting method enables us to gain insights into the processes of melting and re-melting as well as to investigate the defects inherent to the procedure. 14 Columnar microstructures were observed to align parallel to the direction of buildup.…”

Section: Introductionmentioning

confidence: 99%

Effect of parameters on quality of IN718 parts using laser additive manufacturing

Dwivedi,

Khurana,

Bala

2024

Materials Science and Technology

View full text Add to dashboard Cite

The objective of this study is to determine the effect of process parameters such as laser power, scanning speed and layer thickness on the mechanical properties, microstructure and fracture mechanism of Inconel 718 using laser powder bed fusion additive manufacturing process. Full factorial design, regression modelling and response surface methodology are used to optimise the process parameters. The highest tensile strength occurs at 350 W laser power, 1300 mm/s scanning speed and 30 µm layer thickness. The optimal parameters for multi-objective optimisation are identical to those used for single-objective optimisation for tensile strength. The difference between the predicted and actual tensile strength is 0.33%. This work shows a successful methodology using IN718 superalloy for various applications in aerospace industry.

show abstract

Fatigue Lives and Damage Mechanisms at Elevated Temperatures of Steel 42CrMo4 in the HCF and VHCF Regime

Schmiedel,

Kirste,

Morgenstern

et al. 2024

Springer Series in Materials Science

View full text Add to dashboard Cite

This chapter is focused on the fatigue life and damage mechanisms of steel 42CrMo4 in the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) regimes at temperatures up to 773 K. For this purpose, resonance fatigue testing was used at different test frequencies (90 Hz and 20 kHz). The influences of the manufacturing process (wrought or cast condition), as well as the core hardness (various heat treatment conditions), were investigated. Fractographic examinations of the fracture surfaces allowed the analysis of crack-initiating defects. Together with light microscopic observations of the defect distribution, the fatigue mechanisms of the steel 42CrMo4 were investigated at different temperatures (RT, 473 K and 773 K). A short crack model according to Chapetti applied to the present results was used to describe the change in the fatigue damage mechanisms operating at RT/473 K and 773 K, respectively. It is shown that high-temperature fatigue at 773 K was dominated by crack growth, whereas fatigue at RT and 473 K was dominated by crack initiation. These investigations complete the work presented in Chap. 24, in which the influence of nonmetallic inclusions on the ultrasonic fatigue behaviour of steel 42CrMo4 is being analysed at room temperature. The present results provide important insights into the crack-initiating defects and their distributions as they are relevant in typical industrial applications.

show abstract

Very High Cycle Fatigue Investigations on the Fatigue Strength of Additive Manufactured and Conventionally Wrought Inconel 718 at 873 K

Cited by 11 publications

References 65 publications

Role of defects and microstructure on the fatigue durability of Inconel 718 obtained by additive layer manufacturing route

Role of defects and microstructure on the fatigue durability of Inconel 718 obtained by additive layer manufacturing route

Effect of parameters on quality of IN718 parts using laser additive manufacturing

Fatigue Lives and Damage Mechanisms at Elevated Temperatures of Steel 42CrMo4 in the HCF and VHCF Regime

Contact Info

Product

Resources

About