Effects of microstructures on the fatigue crack growth behavior of laser additive manufactured ultrahigh-strength AerMet100 steel

Ran, Xianzhe; Liu, Dong; Li, Jia; Wang, Huaming; Cheng, Xu; Zhang, Ji-kui; Tang, Hao; Liu, Xiao

doi:10.1016/j.msea.2018.02.088

Cited by 38 publications

(9 citation statements)

References 31 publications

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“…These alloy systems have not been extensively studied for grain refinement during AM, but there have been a few successful attempts in introducing inoculants to Fig. 6-Examples of columnar grain structures in (a) 316L steel by WAAM, [142] (b) AerMet100 steel by L-DED, [143] (c) IN718 alloy by electron beam powder bed fusion (EB-PBF), [58] (d) IN625 by L-PBF, [144] (e, f) Co-Cr-Mo alloy by EB-PBF at different heights of as-built rod: (e) bottom and (f) top of part. [145] All figures are reprinted with permissions from Elsevier.…”

Section: Other Alloy Systemsmentioning

confidence: 99%

Grain Refinement of Alloys in Fusion-Based Additive Manufacturing Processes

Zhang

Prasad

Bermingham

et al. 2020

Metall Mater Trans A

159

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Section: Other Alloy Systemsmentioning

confidence: 99%

Grain Refinement of Alloys in Fusion-Based Additive Manufacturing Processes

Zhang

Prasad

Bermingham

et al. 2020

Metall Mater Trans A

159

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“…Figure 10 reveals that, with the values of A and ∆K thr given in Table 7, the AerMet R = 0.1 and 0.5 crack growth curves can be reasonably well represented by Equation (8), and that the variation in the da/dN versus ∆K curves is captured reasonably well by allowing the term to vary from 1.6 to 3.9 MPa √ m; see Table 7. Having characterized crack growth in conventionally manufactured AerMet 100, let us next examine crack growth in AM AerMet 100 [52]. The R = 0.1 da/dN versus ∆K curves presented in [52] for Laser additive manufacturing (LAM) AerMet 100 are shown in Figure 12.…”

Section: Am Aermet100 Steelmentioning

confidence: 99%

“…Having characterized crack growth in conventionally manufactured AerMet 100, let us next examine crack growth in AM AerMet 100 [52]. The R = 0.1 da/dN versus ∆K curves presented in [52] for Laser additive manufacturing (LAM) AerMet 100 are shown in Figure 12. Three different heat treatments were used.…”

Section: Am Aermet100 Steelmentioning

confidence: 99%

Crack Growth in a Range of Additively Manufactured Aerospace Structural Materials

et al. 2018

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The aerospace industry is now beginning to adopt Additive Manufacturing (AM), both for new aircraft design and to help improve aircraft availability (aircraft sustainment). However, MIL-STD 1530 highlights that to certify airworthiness, the operational life of the airframe must be determined by a damage tolerance analysis. MIL-STD 1530 also states that in this process, the role of testing is merely to validate or correct the analysis. Consequently, if AM-produced parts are to be used as load-carrying members, it is important that the d a / d N versus ΔK curves be determined and, if possible, a valid mathematical representation determined. The present paper demonstrates that for AM Ti-6Al-4V, AM 316L stainless steel, and AM AerMet 100 steel, the d a / d N versus ΔK curves can be represented reasonably well by the Hartman-Schijve variant of the NASGRO crack growth equation. It is also shown that the variability in the various AM d a / d N versus Δ K curves is captured reasonably well by using the curve determined for conventionally manufactured materials and allowing for changes in the threshold and the cyclic fracture toughness terms.

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“…Since M decreases with increasing film thickness t f , the damage speed increases with decreased M based on Equation (12). Therefore, the damage speed of the thicker films is faster as shown in Figure 11.…”

Section: Thickness Effect Of Alumina Films On Interface Damage and Fracturementioning

confidence: 92%

“…The steel specimen with apparent textured grains showed the poor cracking resistance and the fracture mode was improved by the heat treatment [ 11 ]. Recently, the effects of the thickness of the film on the crack density in the film and the crack initiation strain were investigated based on a residual stress model [ 12 ]. The effects of the specimen thickness and crack length on the variation of J integral were obtained by three dimensional finite element simulation [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Interface Strength, Damage and Fracture between Ceramic Films and Metallic Substrates

Liang

Chen

et al. 2021

Materials

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Interface strength, damage and fracture properties between ceramic films and metallic substrates affect the service reliability of related parts. The films’ thickness, grain size and residual stress affect the interface properties and fracture behavior, thus related studies attract great attention. In this paper, the interface damage evolution and fracture behavior between ceramic films and metallic substrates were simulated by developing a three dimensional finite element model of alumina films on Ni substrates with cohesive elements in the interfaces. The interface fracture energy as a key parameter in the simulation was firstly determined based on its thermodynamic definition. The simulation results show the Mises stress distribution and damage evolution of the film/substrate structures during uniaxial tensile loading. Specially, when grain size of the films is in nanoscale, the interface strength increases obviously, agreeing with the previous experimental results. The effects of residual stress on interface properties was further simulated. The interface strength was found to decrease with increasing radial residual force and the axial residual pressure increases the interface strength. When the thickness of the films increases, the interface strength keeps a constant but the speed of interface damage becomes faster, that is, the thicker films show catastrophic fracture. The underlying mechanism of damage speed was analyzed. Understanding these size effects and the effects of residual stress is helpful to guide the design of related parts.

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Effects of microstructures on the fatigue crack growth behavior of laser additive manufactured ultrahigh-strength AerMet100 steel

Cited by 38 publications

References 31 publications

Grain Refinement of Alloys in Fusion-Based Additive Manufacturing Processes

Grain Refinement of Alloys in Fusion-Based Additive Manufacturing Processes

Crack Growth in a Range of Additively Manufactured Aerospace Structural Materials

Interface Strength, Damage and Fracture between Ceramic Films and Metallic Substrates

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