Influence of mechanical activation of steel powder on its properties

4th International Conference on Competitive Materials and Technology Processes

Vaulina, O.Yu.^1 ; Darenskaia, E.A.^1 ; Myachin, Y.V.^1 ; Vasilyeva, I.E.^1 ; Kulkov, S.N.^1,2,3

Tomsk Polytechnic University, Russia^1

Tomsk State University, Russia^2

Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, Tomsk, Russia^3

关键词: Activation time;    Fcc structures;    Hardness increase;    Mechanical activation;    Phase state;    Planetary ball milling;    Sintered steels;    Steel powder;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/175/1/012038/pdf
DOI  :  10.1088/1757-899X/175/1/012038

来源: IOP

【 摘 要 】

It has been studied properties of stainless steel based powders after mechanical activation using planetary ball milling technique. It have been shown that after one minute mechanical activation porosity of sintered steel is less than 5%, which is less than the porosity of the sintered steel powder without mechanical activation. The sample without activation has austenite state, which changes after activation toaustenite and ferrite mixtures. X-ray analysis confirmed that the mechanical activation leads to a change in the phase state of the samples: the samples without activation of the FCC structure (γ-Fe), after activation - FCC (γ-Fe) and BCC (α-Fe). The hardness increases at increasing activation time from 800 MPa for the sample without mechanical activation to 1250 MPa for the sample with the activation time of 10 minutes.