The effect of laser welding modes on mechanical properties and microstructure of 304L stainless steel parts fabricated by laser-foil-printing additive manufacturing

Hung, Chia-Hung; Chen, Wei‐Ting; Sehhat, M. Hossein; Leu, Ming C.

doi:10.1007/s00170-020-06402-7

Cited by 48 publications

(36 citation statements)

References 38 publications

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“…4,[17][18][19][20][21][22][23][24] In recent years, the mechanical performance of additively manufactured (AM) materials has caught the attention of research communities due to their extensive applications. [25][26][27][28][29] Despite the conducted research up to this point, many aspects of the AM materials are still less explored. For example, given the high level of flaws observed in AM parts' microstructures, it is important to distinctly study their performance under different load types.…”

Section: Introductionmentioning

confidence: 99%

Small‐sized specimen design with the provision for high‐frequency bending‐fatigue testing

Ghadimi

Jirandehi

Nemati

et al. 2021

Fatigue Fract Eng Mat Struct

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The testing and study of emerging materials-such as additively manufactured materials-demands for specimen designs that are cost effective and time saving. The design of a small-sized bending-fatigue test specimen for an ultrasonic fatigue testing system is reported in this paper. The design is optimized based on the finite element analysis and analytical-solution results to achieve the proper vibration shape and stress distribution. The proposed design is evaluated in the high-and very-high-cycle fatigue regimes under 20-kHz frequency. Both simulation and testing results confirm that the desirable vibration mode occurs and the specimen fails at the designated test (gauge) section, where the maximum stress exists. The stress-life (S-N) curve is obtained for Inconel alloy 718 and indicates an expected trend.

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Section: Introductionmentioning

confidence: 99%

Small‐sized specimen design with the provision for high‐frequency bending‐fatigue testing

Ghadimi

Jirandehi

Nemati

et al. 2021

Fatigue Fract Eng Mat Struct

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“…For instance, it is well established that the permanent cyclic deformations occur due to slip irreversibility, which itself stems from slip or twinning of crystal lattice 32 . Therefore, grain‐scale plastic strain and the associated energy may be considered as key factors for the accurate modeling of fatigue damage, particularly in the case of additively manufactured materials where the presence of internal defects caused during the layer‐by‐layer building of a component significantly affects the microstructure behavior 33–36 …”

Section: Introductionmentioning

confidence: 99%

General quantification of fatigue damage with provision for microstructure: A review

Jirandehi

Khonsari

2021

Fatigue Fract Eng Mat Struct

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Recent developments in microstructure‐sensitive computational modeling and experimental verification have provided significant insight on how one can estimate fatigue damage and predict useful life. As a myriad of methods and approaches are available, it is important to understand how to properly utilize them in a unified and efficient framework for the quantification of damage in safety‐critical components such as jet engine fan blades, gas turbine disks, and airframe structural connections. To this end, the microstructure‐sensitive studies considering crystal plasticity are reviewed, and methods for implementing the statistical representations of material microstructure are presented. Finally, a computational crystal plasticity approach utilizing the statistical representation of parameters and a new thermodynamically based framework is suggested.

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“…2 During the past decades, with technology development, many studies tried to investigate the deformation behavior and other mechanical properties of different materials. [3][4][5][6] Kim et al 7 reported the strain rate effect on the formability of auto-body steel sheets. They found out that the FLC of low strength steel (CQ) and high strength steel (DP590) at high strain rate forming are notably lower than the static FLC.…”

Section: Introductionmentioning

confidence: 99%

A method and apparatus for determination of the ultrasonic-assisted forming limit diagram

Najafizadeh

Rajabi

Hashemi

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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It was recently demonstrated that ultrasonic vibrations could result in lower forming forces and a better surface finish in a wide range of metal forming processes. The Nakazima stretch-forming test is a long-established experimental procedure for the formability evaluation of sheet metals. Today, the development of a standard test is critical for assessing sheet metals’ formability enhancement due to ultrasonic vibrations, which can potentially unlock the material selection limit in various manufacturing applications. This study aims to present a method and apparatus for effectuating the forming limit diagram (FLD). At the same time, high-frequency ultrasonic vibrations are combined with the movement of the forming tool. Taking St14 steel as an example, the mechanical and microstructural properties such as formability, Micro-Vickers hardness, and grain sizes were systematically investigated. Furthermore, the conventional FLD, as well as the novel “Ultrasonic-Assisted Forming Limit Diagram” (UA-FLD), were attained and compared with a nonlinear regression-based approach. The results have indicated that superimposing ultrasonic vibrations with the amplitude of 15µm at the frequency of 20 kHz to the tool would cause a notable enhancement in forming limit diagram, a maximum of 28% increase in hardness, and a 23% reduction in average grain size of the specimens.

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The effect of laser welding modes on mechanical properties and microstructure of 304L stainless steel parts fabricated by laser-foil-printing additive manufacturing

Cited by 48 publications

References 38 publications

Small‐sized specimen design with the provision for high‐frequency bending‐fatigue testing

Small‐sized specimen design with the provision for high‐frequency bending‐fatigue testing

General quantification of fatigue damage with provision for microstructure: A review

A method and apparatus for determination of the ultrasonic-assisted forming limit diagram

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