Research on Cracked Conditions in Nickel Chrome Alloy Ni50Cr33W4.5Mo2.8TiAlNb, Obtained by Direct Laser Deposition
نویسندگان
چکیده
Nowadays, additive manufacturing (AM) is a powerful way to make complex-shaped components for airspace engineering from nickel-based superalloys. So, while superalloys could easily be we L-DED in sheet-metal thicknesses, they suffered strain-age cracking and solidification during AM or the post-weld aging treatment. This attributed fact that besides limitation of ??- phase forming elements (Al Ti), as form by very rapidly reduce ductility, majority contain carbide-forming such Cr, Mo, W. The precipitation carbides, which effective strengthening, develops cracks heat-affected zone (HAZ) AM. difference isochoric heat capacities thermal expansion coefficient (TEC) at boundary leads appearance dangerous local destruction energy. If area interfacial interface sufficiently extended, then accumulation this energy reaches level sufficient crack formation. We have proposed initiation criterion (CIC) assessing fracture CIC was derived an estimate balance transfer equation two-phase area. Practical approbation carried out after samples Ni50Cr33W4.5Mo2.8TiAlNb (EP648) alloy powder with increased carbon content based on study chemical composition near formed solidification. Using provides opportunity give rank according degree their influence Thus, release aluminum carbide turned 5.48 times more than titanium 5 tungsten molybdenum.
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ژورنال
عنوان ژورنال: Metals
سال: 2022
ISSN: ['2075-4701']
DOI: https://doi.org/10.3390/met12111902