Effect of Mg treatment and cooling rate on primary carbides in GH3128 alloy
Journal of Materials Research and Technology(2023)
摘要
The banded aggregation of primary carbides in GH3128 alloy severely affects the thermo-plasticity and creep life of the alloy. Therefore, the effects of Mg treatment and cooling rate on primary carbides in the alloy were investigated in a resistance furnace. To differ-entiate the cooling rate, after alloying, the molten alloy per heat was air-cooled and furnace-cooled, respectively. The results indicate that neither Mg treatment nor increasing cooling rate can change the composition and type of primary carbides. However, as the Mg content increases from 0 to 0.0130%, the primary carbides are gradually dispersed and reduced in size and increased in number due to the refinement of dendrite structures by Mg treatment. Meanwhile, the irregular skeleton-like primary carbides are interrupted into relatively regular blocks and short bars. Compared with the furnace-cooled samples, the primary carbides in the air-cooled samples are finer in size because the refinement of dendrite structures inhibits the remote diffusion of carbide-forming elements. However, the rapid nucleation of primary carbides in the air-cooled samples results in an increase in their number. Consequently, compared with the furnace-cooled sample without Mg addition, the size of primary carbides in the air-cooled sample with 0.0130%Mg addition is reduced by about 76%, while the number of primary carbides is increased by 6.3 times.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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关键词
GH3128 alloy,Primary carbide,Mg treatment,Cooling rate,Dendrite structure
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