The impact of powder oxygen content on formability of 12CrNi2 alloy steel fabricated by laser melting deposition

In this paper, FeCrNiBSiMo x (x = 1.0, 1.5, 2.0, 2.5) stainless steels were successfully prepared using a laser melting deposition technology, with the aim to investigate the effect of Mo content on microstructure and corrosion behaviors. The results showed that the as-deposited specimens were composed mostly of α-Fe and a small amount of (Cr, Mo) 7 C 3 , and (Cr, Mo) 7 C 3 existed in the inter-dendritic (ID) region. As the Mo content increased, grain refinement could be clearly observed, and the area of the ID region increased from 27% to 54%. The low-angle boundaries accounted for 60-70% of the grain boundaries of the as-deposited specimens. Increasing the content of Mo improved the microhardness of the as-deposited specimens from 652 HV to 813 HV.The corrosion current density of the as-deposited specimens with the Mo mass fractions of 1.0%, 1.5%, 2.0%, and 2.5% were 1.37 × 10 −6 , 1.02 × 10 −7 , 6.19 × 10 −7 , and 3.06 × 10 −7 A/cm 2 , respectively. The as-deposited specimen with Mo content of 1.5% had lower cumulative erosion loss and erosion loss rate than other as-deposited specimens. The FeCrNiBSiMo x (x = 1.5) specimen exhibited excellent resistance to electrochemical corrosion and cavitation erosion.

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“…Thus, lattice distortion occurs. According to the following equation:

2 d \sin θ = n italicλ normal,

where

d

is the spacing between the planes in the atomic lattice, θ is the angle between the incident ray and the scattering planes,

n

is an integer, and λ is the wavelength of the incident wave. The atomic radius of Mo (2.01 Å) is greater than the atomic radius of Fe (1.72 Å) .…”

Section: Resultsmentioning

confidence: 99%

Microstructure and corrosion behaviors of FeCrNiBSiMo_x stainless steel fabricated by laser melting deposition

Chen

Zhang

Cui

et al. 2019

Materials & Corrosion

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“…The laser DED technique uses a laser as the heat source to generate a molten pool in the deposition area moving at a high speed. The raw materials (wire or powder) are directly fed into the high-temperature melt area for rapid meltingsolidification, ultimately resulting in complete parts via layer-by-layer deposition, as shown in Figure 3 [44,45]. It can be further subdivided into laser metal deposition (LMD), direct laser metal deposition (DLMD), laser-engineered net shaping (LENS), laser cladding (LC), etc.…”

Section: Laser Am Techniques For Metal Fgmsmentioning

confidence: 99%

Review of Additive Manufacturing Techniques for Large-Scale Metal Functionally Graded Materials

et al. 2022

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Functionally graded materials (FGMs), which constitute a new type of composite material, have received considerable attention in industry because of the spatial gradient of their composition and the microstructure-induced gradient in their material performance, which make them better suited for high-performance multifunctional applications. Additive manufacturing (AM) has become one of the most promising techniques for the manufacture of materials and structures because of its high flexibility. The combination of advanced materials (FGMs) and advanced manufacturing methods (AM) is expected to facilitate the further development of such engineering materials. In this paper, the definition, historical development and material gradient types of FGMs are introduced. The classification, process principle and typical research results of the AM of metal FGMs are summarized and discussed. In particular, the research status of wire and arc additive manufacture (WAAM), which is more suitable for the preparation of large-scale metal FGMs, is reviewed in detail according to the types of FGMs, and a double-wire bypass plasma arc additive manufacturing technique, which is suitable for inducing a gradient along the direction of single-pass cladding, is proposed. On the basis of this summary of the important achievements made to date, future research is proposed.

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“…It has been validated in typical applications of structural parts, such as diesel engine shafts, which are large in size and are complex constructions. Recently, the utilization of the DED to fabricate 12CrNi2 has been investigated by some researchers [4][5][6]. The as-deposited 12CrNi2 was characterized as having a microstructure consisting of dual phases of major ferrite and minor austenite [7].…”

Section: Introductionmentioning

confidence: 99%

Quenching and Tempering-Dependent Evolution on the Microstructure and Mechanical Performance Based on a Laser Additively Manufactured 12CrNi2 Alloy Steel

et al. 2023

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For exploring an effective heat treatment schedule to enhance the strength–plasticity balance of the ferrite–austenite 12CrNi2 alloy steel additively manufactured by directed energy deposition (DED), 12CrNi2 was heat-treated with deliberately designed direct quenching (DQ) and cyclic quenching (CQ), respectively, and the differently quenched steels were then tempered at a temperature from 200 °C to 500 °C. It was found that the CQ, in contrast to the DQ, led the 12CrNi2 to have significantly increased tensile strength without losing its plasticity, based on the introduction of fine-grained lath martensite and the {112}<111>-type nanotwins. The nanotwins were completely degenerated after the 200 °C tempering. This led the CQ-treated steel to decrease in not only its tensile strength, but also its plasticity. In addition, an interesting phenomenon observed was that the DQ-induced laths and rod-like precipitates, and the tempering-induced laths and rod-like precipitates were all prone to be generated along the {112} planes of the martensitic crystal (α-Fe), which were exactly fitted with the {112}-type crystalline orientation of the long or short nanotwins in the CQ-induced martensite. The quenching–tempering-induced generation of the {112}-orientated laths and rod-like precipitates was explicated in connection with the {112}<111>-type long or short nanotwins in the CQ-induced lath martensite.

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The impact of powder oxygen content on formability of 12CrNi2 alloy steel fabricated by laser melting deposition

Cited by 17 publications

References 62 publications

Microstructure and corrosion behaviors of FeCrNiBSiMo_x stainless steel fabricated by laser melting deposition

Microstructure and corrosion behaviors of FeCrNiBSiMo_x stainless steel fabricated by laser melting deposition

Review of Additive Manufacturing Techniques for Large-Scale Metal Functionally Graded Materials

Quenching and Tempering-Dependent Evolution on the Microstructure and Mechanical Performance Based on a Laser Additively Manufactured 12CrNi2 Alloy Steel

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The impact of powder oxygen content on formability of 12CrNi2 alloy steel fabricated by laser melting deposition

Cited by 17 publications

References 62 publications

Microstructure and corrosion behaviors of FeCrNiBSiMox stainless steel fabricated by laser melting deposition

Microstructure and corrosion behaviors of FeCrNiBSiMox stainless steel fabricated by laser melting deposition

Review of Additive Manufacturing Techniques for Large-Scale Metal Functionally Graded Materials

Quenching and Tempering-Dependent Evolution on the Microstructure and Mechanical Performance Based on a Laser Additively Manufactured 12CrNi2 Alloy Steel

Contact Info

Product

Resources

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Microstructure and corrosion behaviors of FeCrNiBSiMo_x stainless steel fabricated by laser melting deposition

Microstructure and corrosion behaviors of FeCrNiBSiMo_x stainless steel fabricated by laser melting deposition