The precipitation control in aged alumina-forming austenitic stainless steels Fe-15Cr-25Ni-3Al-NbWCu by W addition and its effect on the mechanical properties

Meng, Haojie; Wang, Jian; Wang, Lan; Fang, Xudong; Dong, Nan; Zhang, Caili; Han, Peide

doi:10.1016/j.matchar.2020.110233

Cited by 22 publications

(11 citation statements)

References 52 publications

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“…This improved behavior was traced back to an increased fraction and reduced size of Laves phase precipitates due to an increased content of W in the Laves phase [856]. The same positive effect of W addition was reported for an AFA stainless steel Fe-15Cr-25Ni-3Al-NbWCu (wt%) [857].…”

Section: Austenitic Steels and Alloyssupporting

confidence: 58%

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

2020

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Laves phases with their comparably simple crystal structure are very common intermetallic phases and can be formed from element combinations all over the periodic table resulting in a huge number of known examples. Even though this type of phases is known for almost 100 years, and although a lot of information on stability, structure, and properties has accumulated especially during the last about 20 years, systematic evaluation and rationalization of this information in particular as a function of the involved elements is often lacking. It is one of the two main goals of this review to summarize the knowledge for some selected respective topics with a certain focus on non-stoichiometric, i.e., non-ideal Laves phases. The second, central goal of the review is to give a systematic overview about the role of Laves phases in all kinds of materials for functional and structural applications. There is a surprisingly broad range of successful utilization of Laves phases in functional applications comprising Laves phases as hydrogen storage material (Hydraloy), as magneto-mechanical sensors and actuators (Terfenol), or for wear- and corrosion-resistant coatings in corrosive atmospheres and at high temperatures (Tribaloy), to name but a few. Regarding structural applications, there is a renewed interest in using Laves phases for creep-strengthening of high-temperature steels and new respective alloy design concepts were developed and successfully tested. Apart from steels, Laves phases also occur in various other kinds of structural materials sometimes effectively improving properties, but often also acting in a detrimental way.

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Section: Austenitic Steels and Alloyssupporting

confidence: 58%

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

2020

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“…The co-precipitation of B2-NiAl and Fe2Nb Laves phases has been observed previously in AFA alloys microstructure [20,26,39]. One possible explanation is that the precipitation of Fe2Nb Laves phase leads to the occurrence of Fe-depleted regions, in which the formation of B2-NiAl phase and of Cr-rich ferrite is triggered in adjacent location, at lower temperature than in the Nb-free alloys.…”

Section: Discussionsupporting

confidence: 65%

“…Y and Nb have significant positive influence on the corrosion resistance and the phase composition of the alloys.small amounts of other elements can also be added to optimize the properties (e.g. mechanical, corrosion resistance, structure stability) for applications, for instance, stabilize the austenite structure (C, Cu, Mn), precipitate the minor secondary phases (Nb, Ti), increase scale adherence (Y), strengthen the austenite (W, Mo) and its grain boundaries (B) [17][18][19][20][21][22][23][24][25][26][27][28][29].Recent research results indicate that alumina forming austenitic (AFA) model alloys with the chemical composition formula Fe-(20-29)Ni-(15.2-16.5)Cr-(2.3-4.3)Al (wt.%) are able to form alumina-rich protective scale during exposure to oxygen-containing molten Pb at 550-600 °C for 1000 h and to preserve the austenitic matrix [9][10]. The passive and continuous oxide scales, grown on alloy surfaces, are based on two corundum-type crystalline structures, Cr2O3 and Al2O3-Cr2O3 solid solutions.…”

mentioning

confidence: 99%

“…small amounts of other elements can also be added to optimize the properties (e.g. mechanical, corrosion resistance, structure stability) for applications, for instance, stabilize the austenite structure (C, Cu, Mn), precipitate the minor secondary phases (Nb, Ti), increase scale adherence (Y), strengthen the austenite (W, Mo) and its grain boundaries (B) [17][18][19][20][21][22][23][24][25][26][27][28][29].…”

mentioning

confidence: 99%

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The influence of Y and Nb addition on the corrosion resistance of Fe-Cr-Al-Ni model alloys exposed to oxygen-containing molten Pb

et al. 2021

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“…Among these, tungsten as a novel alloying element has an excellent hardening effect, which can be used to enhance the matrix and improve the high temperature strength (Deng et al, 2014;Xuan et al, 2019). The sintered PM materials with W addition show good wear resistance due to the forming of carbides (Silva et al, 2009), and reduce the stress concentration at high temperature (Meng et al, 2020). However, the particle size of tungsten elemental powders used in PM process is almost smaller than of the raw iron powders, and the density difference between W and Fe is large.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Property of Sintered Fe-2Cu-0.8C-0.6Mo-2W Materials Prepared From Prediffused Powders

et al. 2020

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Prediffused Fe-W powder with 2 wt% of tungsten was prepared by heating Fe-W powder mixes at 800°C for 45 min in H2 atmosphere. Two kinds of Fe-2Cu-0.8C-0.6Mo-2W powder mixtures were obtained by mechanically mixing the prediffused Fe-W powders with the other elemental powders. After pressing and sintering, the sintered Fe-2Cu-0.8C-0.6Mo-2W materials were obtained from the two powder mixtures. The effects of the introducing methods of tungsten element and sintering conditions on microstructure, mechanical and wear properties of the sintered samples were investigated. The results show that with the increase of sintering temperature and time, hardness and strength of sintered samples increase. Prediffused treatment of Fe-W powder can improve density of green compacts and sintered samples. When W element introduced in the form of prediffused Fe-W powders, the compacts pressed at 700 MPa have a green density of 7.13 g/cm3, and after sintered at 1,150°C, the density, hardness, tensile strength and radial crushing strength of the sintered samples are 7.16 g/cm3, 95 HRB, 547 and 791 MPa, respectively, which are higher than those of the samples prepared from powder mixtures by mechanically mixing the elemental powders. Furthermore, the prediffused treatment of Fe-W powders can improve the distribution of W element and enhance wear resistance.

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The precipitation control in aged alumina-forming austenitic stainless steels Fe-15Cr-25Ni-3Al-NbWCu by W addition and its effect on the mechanical properties

Cited by 22 publications

References 52 publications

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

The influence of Y and Nb addition on the corrosion resistance of Fe-Cr-Al-Ni model alloys exposed to oxygen-containing molten Pb

Microstructure and Property of Sintered Fe-2Cu-0.8C-0.6Mo-2W Materials Prepared From Prediffused Powders

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