Effect of Mg treatment and cooling rate on primary carbides in GH3128 alloy

Release time:2024-11-22 Hits:

First Author:Wei Gong

Correspondence Author:Pengfei Wang

Co author:Hongliang Zhang,Yu Zhang,Zhouhua Jiang

Journal:Journal of Materials Research and Technology

Volume:26

DOI number:10.1016/j.jmrt.2023.09.035

Place of Publication:Brazil

Abstract:The banded aggregation of primary carbides in GH3128 alloy severely affects the thermoplasticity 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 differentiate 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.

Funded by:General project of National Natural Science Foundation of China

Indexed by:SCI JCR Q1

Discipline:Engineering

Document Type:JCR 一区

First-Level Discipline:Metallurgical Engineering

Page Number:6731-6740

ISSN No.:2238-7854

Translation or Not:no