Effect of rare earth Y on microstructure and properties of H13 steel

doi:10.13251/j.issn.0254-6051.2023.05.012

Abstract

Abstract: Effect of different rare earth Y contents on microstructure and properties of H13 die steel was studied. The laboratory used electroslag remelting to obtain H13 steel electroslag ingots with rare earth Y mass fractions of 0.0008%, 0.0060%, and 0.0120%, respectively. The effect of rare earth Y on microstructure was studied by means of OM, SEM, TEM and thermodynamic calculation. The effect of rare earth Y on properties was investigated by using impact testing machine and microhardness tester. The results show that the morphology of cryptocrystalline martensite in the H13 steel changes into dog-bone shape with the addition of rare earth Y. With the increase of Y content, the cryptocrystalline martensites show a local fine and dispersed distribution trend. The concentration of elements in the retained liquid phase in the H13 steel at the solidification end point reaches the concentration of high carbon and high alloy steel, resulting in the formation of liquidus carbide. When the content of rare earth Y is 0.0120%, the segregation degree of C element in the steel decreases from 1.292 to 0.529, the segregation degree of alloy elements Cr, Mo and V also decreases; the proportion of carbides with size larger than 5 μm in the steel is the lowest, and the average size of carbides is 3.13 μm; the transverse impact absorbed energy of the steel after heat treatment is 19.5 J, and the Vickers hardness after annealing and tempering are 244.4 and 525.5 HV0.5, respectively.

Key words: rare earth yttrium, H13 steel, carbide, segregation, properties

CLC Number:

TG142

Shu Ruixi, Yang Zhongmin, Cao Yanguang, Li Zhaodong, Chen Ying, Wang Huimin. Effect of rare earth Y on microstructure and properties of H13 steel[J]. Heat Treatment of Metals, 2023, 48(5): 70-77.

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