Characterisation of powder metallurgy H13 steels prepared from water atomised powders

ABSTRACT

In this paper, powder metallurgy (PM) H13 steels were investigated based on the characterisation of water atomised H13 powders. Vacuum sintering was carried out from 1150 to 1265°C for sintering densification. The relative density of the as-sintered sample reached to 95% and mechanical properties were released above 1200°C. To eliminate the residual pores, subsequent forging was performed. The relative density increased to above 99%. As the concentration of Si elements on the powder surface was higher than the nominal composition, there was Si segregation in the form of silicon oxides (1–3 μm). Although oxide particles such as SiO₂ were inevitable, the mechanical performance of PM H13 steels was still comparable to that of ingot metallurgy products. The tempered PM H13 steels exhibited high tensile strength of 1460 MPa in YS, 1737 MPa in UTS and 8.7% in elongation. Besides, the impact toughness was as high as 14.7 J cm⁻².

KEYWORDS:

• H13 steel
• powder metallurgy
• powder characterisation
• microstructure
• mechanical performance

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Cunguang Chen http://orcid.org/0000-0002-6525-228X

Additional information

Funding

This work was supported by China Postdoctoral Science Foundation: [grant number No. 2018M641188]; Fundamental Research Funds for the Central Universities: [grant number No. FRF-TP-16-017A1]; Fundamental Research Funds for the Central Universities: [grant number No. FRF-TP-18-025A1].