Comparisons of 304 austenitic stainless steel manufactured by laser metal deposition and selective laser melting

Zhang, Yimin; Huang, Weibo

doi:10.1016/j.jmapro.2020.06.042

Cited by 39 publications

(5 citation statements)

References 41 publications

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“…The cooling rate and the temperature gradient decrease with an increase in layers along the building direction of the specimens. [31] Then a relatively finer microstructure can be expected at the bottom region of the LMD TC11 samples, which is a little different from the results in Figure 6. Second, the top region of the LMD-TC11 alloy undergoes fewer remelting cycles.…”

Section: Inhomogeneous Tensile Properties Of the Top And Bottom Samplescontrasting

confidence: 61%

“…The cooling rate of LMD SS304 specimen is about 10 3 °C s À1 , much lower than that of the SLM SS304 at 10 6 °C s À1 . [30,31] The lower cooling rate always results in a uniform temperature field, leading to a relatively homogeneous microstructure, in LMD samples than SLMed samples. The cooling rate and the temperature gradient decrease with an increase in layers along the building direction of the specimens.…”

Section: Inhomogeneous Tensile Properties Of the Top And Bottom Samplesmentioning

confidence: 99%

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Microstructural Inhomogeneity and Mechanical Properties of Ti–6.4Al–3.3Mo–1.6Zr–0.2Si Alloy Fabricated by Laser Metal Deposition

Yang

Cai³

et al. 2023

Adv Eng Mater

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Laser metal deposition (LMD) additive manufacturing has gained growing interest in the aerospace industry. Herein, a Ti–6.4Al–3.3Mo–1.6Zr–0.2Si (TC11) titanium alloy is produced by LMD. The inhomogeneity of multiscale grain morphology and mechanical properties are systematically investigated. The results indicate that the melting pool (MP) morphology can be divided into three areas: melting pool center (MPC), melting pool boundary (MPB), and heat‐affected zone (HAZ), respectively. The widths of α laths in MPB are larger than that in HAZ and MPC, which result in a lower microhardness in MPB than that in MPC. Besides, the columnar grains are generally distributed along the deposition direction. The average widths of the α laths in the top and bottom MPC regions are about 0.58 and 0.67 μm, respectively. Correspondingly, the ultimate tensile strength and fracture elongation of the top and bottom samples are 1,053.5 MPa, 16.7%, and 1,011.5 MPa, 20.7%, respectively, which suggest the inhomogeneity of mechanical properties. The initiation fracture sites of both the top and bottom samples are presumed to be the α lath inside the MPB according to stress distribution analysis. The formation mechanisms of inhomogeneous grain structures and their influences on mechanical performance are also discussed.

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Section: Inhomogeneous Tensile Properties Of the Top And Bottom Samplescontrasting

confidence: 61%

Section: Inhomogeneous Tensile Properties Of the Top And Bottom Samplesmentioning

confidence: 99%

Microstructural Inhomogeneity and Mechanical Properties of Ti–6.4Al–3.3Mo–1.6Zr–0.2Si Alloy Fabricated by Laser Metal Deposition

Yang

Cai³

et al. 2023

Adv Eng Mater

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“…The material properties, processing parameters and dimensions of SS304 smooth specimen manufactured by LMD have been given in the literature. 29,30 The main material properties of SS304 are given in Table 1. The main process parameters are given in Table 2.…”

Section: Methodsmentioning

confidence: 99%

Investigation on fatigue life prediction and reliability design of 304 stainless steel manufactured by laser metal deposition

Huang

Zhang

2022

Proceedings of the Institution of Mechanical Engineers, Part O:

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Laser metal deposition (LMD) is an advanced technology to manufacture the specimen by layer-by-layer method. In this paper, the fatigue tests of 304 stainless steel (SS304) smooth specimens manufactured by LMD are conducted with the stress ratio of −1 and the frequency of 10 Hz. Considering that the fatigue crack is caused by the material defect on the subsurface, the fatigue life of smooth specimen under the different cyclic stress amplitudes are predicted based on the dislocation model, equivalent initial crack size and empirical formula. Lognormal, two-parameter Weibull and extreme maximum value distributions are applied to describe the fatigue life of the smooth specimens at the different cyclic stress amplitudes. The result shows that two-parameter Weibull distribution has the best ability to describe the fatigue life distribution. Based on two-parameter Weibull distribution, the probabilistic-stress-number ( P- S-N) curves at the four different reliability levels are plotted. Combined with the material strength degradation rule, the design checkpoint method is adopted to analyze the fatigue life reliability of smooth specimens under the different cyclic stress amplitudes. The reliability results are close to those of two-parameter Weibull distribution.

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“…Due to their different forming mechanisms, SLM technology achieves a more uniform and smoother surface compared to LMD [2,3]. In addition, SLM technology allows for better control of melt pool formation and solidi cation, resulting in a more stable and uniform melt pool, which helps reduce surface defects and waviness [4]. Therefore, the surface quality and waviness of parts manufactured by SLM technology are superior to those produced by LMD technology.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Laser Asynchronous Processing for Laser Metal Deposition Manufacturing of Ti6Al4V

Song,

Zhou

2024

Preprint

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Additive manufacturing technology has rapidly developed to enable the manufacturing of various complex feature parts. However, parts manufactured through Laser Metal Deposition (LMD) often exhibit poor surface quality with the waviness of significant peak-to-valley distances, making it hard to improve surface quality through laser polishing. This study proposes a surface treatment method using ultrafast laser asynchronous processing to solve the issue of large waviness in Ti6Al4V parts manufactured by LMD, in which rough processing is carried out using picosecond laser with a galvanometer and precision processing is conducted using femtosecond laser with an objective lens. The influence of laser energy, defocus distance, and repetition times on material surface quality is investigated. Using the proper processing parameters, the initial surface with a step of 250 µm can be eliminated, which demonstrates the feasibility of ultrafast laser asynchronous processing in reducing peak-to-valley distance in materials.

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Comparisons of 304 austenitic stainless steel manufactured by laser metal deposition and selective laser melting

Cited by 39 publications

References 41 publications

Microstructural Inhomogeneity and Mechanical Properties of Ti–6.4Al–3.3Mo–1.6Zr–0.2Si Alloy Fabricated by Laser Metal Deposition

Microstructural Inhomogeneity and Mechanical Properties of Ti–6.4Al–3.3Mo–1.6Zr–0.2Si Alloy Fabricated by Laser Metal Deposition

Investigation on fatigue life prediction and reliability design of 304 stainless steel manufactured by laser metal deposition

Ultrafast Laser Asynchronous Processing for Laser Metal Deposition Manufacturing of Ti6Al4V

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