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.

中文翻译：

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由水雾化粉末制备的粉末冶金 H13 钢的表征

摘要 在本文中，基于水雾化 H13 粉末的表征研究了粉末冶金 (PM) H13 钢。真空烧结在1150～1265℃进行烧结致密化。烧结态样品的相对密度达到 95%，机械性能在 1200°C 以上释放。为消除残留气孔，进行后续锻造。相对密度增加到99%以上。由于粉末表面的 Si 元素浓度高于标称成分，因此存在以氧化硅（1-3 μm）形式存在的 Si 偏析。尽管 SiO2 等氧化物颗粒不可避免，但 PM H13 钢的机械性能仍可与铸锭冶金产品相媲美。回火 PM H13 钢在 YS 中表现出 1460 MPa 的高抗拉强度，在 UTS 中为 1737 MPa，伸长率为 8.7%。此外，冲击韧性高达 14.7 J cm-2。