Addressing the issue of precipitates in maraging steels – Unambiguous answer

Moshka, O.; Pinkas, Malki; Brosh, Eli; Ezersky, Vladimir; Meshi, Louisa

doi:10.1016/j.msea.2015.04.067

Cited by 77 publications

(47 citation statements)

References 25 publications

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“…In addition the rod shape of Ni 3 Mo generates short range stresses in the matrix (Figs. 4,5). The strengthening effect of precipitates is related to the interaction of their coherency stresses with the dislocations in the matrix.…”

Section: Experimental Observationsmentioning

confidence: 99%

“…The unique mechanical properties stem from fine precipitation of Ni 3 Mo and Ni 3 Ti in the soft martensitic matrix during the early stage of aging. Fe x Mo y precipitates are formed at later stages on the expense of Ni 3 Mo [5]. Experimentally, it is difficult to distinguish between the Ni 3 Mo and Ni 3 Ti and their effect on the properties of the steel.…”

Section: Introductionmentioning

confidence: 99%

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Elastic consideration of the precipitation in model alloys of maraging steels: theory and experimental validation

Shmulevitsh

Meshi

Pinkas³

et al. 2015

J Mater Sci

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The unique combination of high strength and high fracture toughness in maraging steels is attributed to the precipitation of mainly two phases, Ni 3 Mo and Ni 3 Ti, in the soft bcc martensitic matrix. Experimentally, it is difficult to distinguish between these phases; moreover, the effect of each precipitating phase on the properties of the steel is ambiguous. In the present work, we tackle these questions by analyzing the elastic fields and elastic energy associated with each precipitating phase and their role in the determination of the shape and relative arrangement. Using a semi-analytic approach based on the solution of the equations of elasticity by Fourier transform, the elastic fields and elastic energy associated with each precipitate were calculated. The calculations show that the minimum self-energy of both precipitates is accomplished when the smallest crystallographic misfit lies parallel to the longest geometric axis. The combination of elastic energy and surface energy provides an explanation to the observed morphologies of the precipitates, each type having an elongated shape but with a different aspect ratio. According to the calculations, the minimum self-elastic energy associated with Ni 3 Ti coherent precipitate is 2.8-fold larger than the energy of Ni 3 Mo. This implies for a larger strengthening effect of the former, as was confirmed experimentally in model alloys, one without Mo and the other without Ti. The elastic model also predicts that elongated shape and the anisotropic misfit strains favor several vertical arrangements of both precipitates, as was also verified experimentally by transmission electron microscopy of aged model alloys.

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Section: Experimental Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Elastic consideration of the precipitation in model alloys of maraging steels: theory and experimental validation

Shmulevitsh

Meshi

Pinkas³

et al. 2015

J Mater Sci

Self Cite

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“…Também é mostrada uma micrografia em campo escuro na amostra tratada por 1 h (figura 14b) (MOSHKA et al, 2015).…”

Section: Precipitação De Compostos Intermetálicos Na Martensitaunclassified

“…Nessa seção foi dada uma ênfase na caracterização de amostras superenvelhecidas, pois os precipitados formados em estágios iniciais do envelhecimento têm um tamanho da ordem de dezenas de nanômetros, cuja observação seria possível apenas em microscopia eletrônica de transmissão ou microscopia de campo iônico (SHA; CEREZO; SMITH, 1993d; VASUDEVAN; KIM; WAYMAN, 1990;ASUNDI, 1993a;MOSHKA et al, 2015.…”

Section: Análise Da Microestrutura Após O Envelhecimento Para O Aço Munclassified

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Um estudo cinético da precipitação de compostos intermetálicos e da reversão da martensita em aços maraging 300 e 350.

Carvalho¹

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Development of a New Tooling Steel (L40) for Laser Powder Bed Fusion: Influence of Particle Size Distribution and Powder Atomization on Mechanical Performance

et al. 2021

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Additive manufacturing (AM) is widely used for tooling applications: Complex conformal cooling channels are designed to increase and homogenize the cooling rate of a mold insert. The list of available steel grades in laser powder bed fusion is currently very limited and does not satisfy highly mechanically demanding applications; hard stainless steel metals printable without cracking are lacking. Herein, the influence of the particle size distribution and atomization process on the printability of a new tooling steel tailored for AM (L40) is observed on an EOS M290 printer based on microstructural observations and mechanical testing. Several batches with different powder size distributions of either gas‐ or water‐atomized powder are processed and studied. The aim of using water‐atomized powder is to reduce both the environmental footprint and the cost of the feed material. Dense built parts (other 99% density) are achieved using water‐ and gas‐atomized powders. The hardness is in all cases superior to 50 HRC, which is above the standard requirement for injection molding applications. The ductility of gas‐atomized parts is four times higher than that measured on heat‐treated maraging steel. Water‐atomized samples reach a ductility similar to that of maraging steel.

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Addressing the issue of precipitates in maraging steels – Unambiguous answer

Cited by 77 publications

References 25 publications

Elastic consideration of the precipitation in model alloys of maraging steels: theory and experimental validation

Elastic consideration of the precipitation in model alloys of maraging steels: theory and experimental validation

Um estudo cinético da precipitação de compostos intermetálicos e da reversão da martensita em aços maraging 300 e 350.

Development of a New Tooling Steel (L40) for Laser Powder Bed Fusion: Influence of Particle Size Distribution and Powder Atomization on Mechanical Performance

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