Microstructure and mechanical properties of wire arc additively manufactured Hastelloy C276 alloy

Qiu, Zhijun; Wu, Bintao; Zhu, Hanliang; Wang, Zhiyang; Hellier, A.K.; Ma, Yan; Li, Hui Jun; Muránsky, Ondrej; Wexler, David

doi:10.1016/j.matdes.2020.109007

Cited by 84 publications

(24 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The inhomogeneous microstructure and anisotropy effect would further influence the mechanical properties of additive manufactured components [ 24 ]. The relatively poor dimensional accuracy is another unfavorable impact for the wide application of WAAM [ 25 , 26 ]. For overcoming the above shortcomings, many researches focusing on dimensional and microstructure control of components were conducted for the WAAM process [ 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Mechanical Properties of a Wire-Arc Additive Manufactured Austenitic Stainless Steel: Effect of Processing Parameter

et al. 2021

View full text Add to dashboard Cite

Two single track multi-layer walls with linear energy inputs (LEIs) of 219 and 590 J/mm were deposited by cold metal transfer-based wire arc additive manufacturing system. Combined with the X-ray diffraction technique, scanning electron microscope and uniaxial tensile tests, the influences of LEI and cooling rate (CR) on the microstructure evolution, mechanical properties and fracture mechanisms of the studied steel are analyzed. It is observed that the microstructures of the studied steel are mainly composed of δ-ferrite and austenite dendrites. σ phase is formed on the δferrite–austenite interface under low CR. Meanwhile, the primary dendrites’ spacing decreases with the decrease in LEI or the increase in CR, and the maximal primary dendrites’ spacing is 32 μm. The values of elongation to fracture roughly decline with the decrease in LEI or the increase in CR, but the variations of ultimate tensile strength and yield stress show an opposite trend. In addition, the mesoscopic damages in the studied steel under low LEI are mainly caused by the coalescence of pores. While under high LEI, the cracks are induced by the dislocations piling up around δ-ferrite.

show abstract

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Mechanical Properties of a Wire-Arc Additive Manufactured Austenitic Stainless Steel: Effect of Processing Parameter

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The concentration of the MoN 1/2 phase showed little variation in this temperature range. [ 68,69 ] It was observed that the film with the highest concentration of MoN 0.5 was deposited at 375 °C, which may give this film the highest microhardness value, as shown in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…Hastelloy C-276 is a nickel-molybdenum-chromium superalloy with added tungsten designed to provide excellent corrosion resistance in a wide range of harsh environments. [68,69] The high nickel and molybdenum content offer greater pitting corrosion resistance. Chromium supplies resistance to the oxidizing media and the low carbon content minimizes the formation of carbides in the grain boundary, making the alloy suitable for applications that require welding procedures.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Corrosion Resistance of Thin Films Formed on AISI 316L Steel by Plasma Using Hastelloy as Cathodic Cage

Monção

Júnior

Bandeira

et al. 2021

Physica Status Solidi (a)

View full text Add to dashboard Cite

Herein, the use of Hastelloy C-276 as a cathodic cage for the deposition of thin films on the AISI 316L steel substrate by plasma is investigated. The films are processed through floating potential at 350, 375, 400, and 425 C for 4 h, using a hydrogen-nitrogen mixture in the proportion of 40% and 60%, respectively. The thin films are investigated by X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and potentiodynamic polarization. The spectroscopy results point out the formation of different phases such as FeNi 3 , CrNi, and MoN 1/2 . Films acquired at 375 ºC present superior corrosion resistance with less negative corrosion potential (À0.020 V). The increase and decrease in FeNi 3 and CrNi contents follow the improvement of the applied temperature, which is unbeneficial to the corrosion resistance of the films.

show abstract

“…Flat samples (Figure 2b) were extracted from a block along its building direction. The transversal direction was not considered, as it was observed in different WAAM materials that there is little to no mechanical anisotropy at the macroscopic scale [5,51,52]. The tests were performed on an MTS tension-torsion servo-hydraulic test rig with a capacity of 250kN.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

A probabilistic approach for high cycle fatigue of Wire and Arc Additive Manufactured parts taking into account process-induced pores

Bercelli

Moyne

D’Hondt

et al. 2021

Additive Manufacturing

View full text Add to dashboard Cite

Wire and Arc Additive Manufacturing (WAAM) is a direct-energy deposition technique (unlike SLM or EBM) that builds up a part in a layer-by-layer fashion, each layer being constituted of interlaced weld beads. It is the best suited Additive Manufacturing (AM) technique for large structures thanks to its high deposition rate (5kg/h). The resulting material shows a rough surface, strong residual stress induced by its complex thermal history, a heterogeneous microstructure marked by the different weld passes as well as defects formed by gas pockets. Despite their rarity, pores are found to have a first-order influence on the fatigue life of machined specimens. The discrepancy in their size (> 100µm) and position is responsible for a considerable scatter that makes classical fatigue tests ineffective. The aim of this study is to propose a novel approach to take into account the effect of rare WAAM-induced defects in high cycle fatigue. To achieve this, numerical porous structures are generated from the knowledge of the real pore population determined by tomography. Their fatigue performances are predicted via a two-scale probabilistic model identified on experimental self-heating results, on which pores have no influence. In that sense, the probabilistic model describes the behaviour of a virtually healthy material. Then, by computing a database of representative pore cases, the whole bundle of Wöhler curves for each numerical porous structure is determined. Finally, the numerical fatigue scatter is in close agreement with experimental data, and it is shown that the ranking in pore criticality according to the model matches the fractography observations. Keywords: Wire and Arc Additive Manufacturing (WAAM) ; High cycle fatigue ; Pores ; Self-heating ; Poisson point process Draft articleIRDL fatigue life of the position of an isolated pore over its size. From this observation a novel approach is proposed in [16], where the total plastic zone in the vicinity of a defect is considered from Finite Element Analysis (FEA). Although gas pores found in WAAM parts have much larger dimensions (>100µm) and have smooth near-spherical shapes [23][24][25], to which notch fatigue and crack initiation approaches are best suited [26,27].In the case of WAAM, a low density of defects can be achieved using the Cold Metal Transfer (CMT) technology [28,29]. Typical WAAM defects are round smooth pores, with sizes ranging from a few micrometers to more than half a millimeter [23,30]. Fatigue samples extracted from optmized WAAM blocks show rare isolated pores with an important discrepancy in size and distance to free surface. As a result, a considerable scatter in fatigue data is observed [31] (for example compared to casting materials), posing quite a challenge to the assessment of fatigue properties by conventional methods (ASTM E466-15 standard [32], the staircase method [33]). These samples do not constitute a Representative Volume Element (RVE) of the material's fatigue behaviour: each sample can be seen as a unique structure. This is t...

show abstract

Microstructure and mechanical properties of wire arc additively manufactured Hastelloy C276 alloy

Cited by 84 publications

References 35 publications

Microstructure Evolution and Mechanical Properties of a Wire-Arc Additive Manufactured Austenitic Stainless Steel: Effect of Processing Parameter

Microstructure Evolution and Mechanical Properties of a Wire-Arc Additive Manufactured Austenitic Stainless Steel: Effect of Processing Parameter

Evaluation of Corrosion Resistance of Thin Films Formed on AISI 316L Steel by Plasma Using Hastelloy as Cathodic Cage

A probabilistic approach for high cycle fatigue of Wire and Arc Additive Manufactured parts taking into account process-induced pores

Contact Info

Product

Resources

About